Usiskin, R. et al. Fundamentals, status and promise of sodium-based batteries. Nat. Rev. Mater. 6, 1020–1035 (2021).
Google Scholar
Zhao, Y. et al. Recycling of sodium-ion batteries. Nat. Rev. Mater. 8, 623–634 (2023).
Google Scholar
Nayak, P. K., Yang, L., Brehm, W. & Adelhelm, P. From lithium-ion to sodium-ion batteries: advantages, challenges, and surprises. Angew. Chem. Int. Ed. 57, 102–120 (2018).
Google Scholar
Orangi, S. et al. Historical and prospective lithium-ion battery cost trajectories from a bottom-up production modeling perspective. J. Energy Storage 76, 109800 (2024).
Google Scholar
Larcher, D. & Tarascon, J. M. Towards greener and more sustainable batteries for electrical energy storage. Nat. Chem. 7, 19–29 (2015).
Google Scholar
Darga, J., Lamb, J. & Manthiram, A. Industrialization of layered oxide cathodes for lithium-ion and sodium-ion batteries: a comparative perspective. Energy Technol. 8, 2000723 (2020).
Google Scholar
Innocenti, A., Beringer, S. & Passerini, S. Cost and performance analysis as a valuable tool for battery material research. Nat. Rev. Mater. 9, 347–357 (2024).
Google Scholar
Peters, J. F., Peña Cruz, A. & Weil, M. Exploring the economic potential of sodium-ion batteries. Batteries 5, 10 (2019).
Google Scholar
Zhu, Z. et al. Comparative study of performance and hybrid battery configuration of sodium-ion and lithium-ion batteries. J. Energy Storage 140, 118904 (2025).
Google Scholar
Yabuuchi, N., Kubota, K., Dahbi, M. & Komaba, S. Research development on sodium-ion batteries. Chem. Rev. 114, 11636–11682 (2014).
Google Scholar
Wang, X. et al. Achieving a high-performance sodium-ion pouch cell by regulating intergrowth structures in a layered oxide cathode with anionic redox. Nat. Energy 9, 184–196 (2024).
Google Scholar
Rudola, A., Sayers, R., Wright, C. J. & Barker, J. Opportunities for moderate-range electric vehicles using sustainable sodium-ion batteries. Nat. Energy 8, 215–218 (2023).
Google Scholar
Cheng, C. et al. Stabilized oxygen vacancy chemistry toward high-performance layered oxide cathodes for sodium-ion batteries. ACS Nano 18, 35052–35065 (2024).
Google Scholar
Liu, Z. et al. Achieving a deeply desodiated stabilized cathode material by the high entropy strategy for sodium-ion batteries. Angew. Chem. Int. Ed. 63, e202405620 (2024).
Google Scholar
Wang, Q. et al. Fast-charge high-voltage layered cathodes for sodium-ion batteries. Nat. Sustain. 7, 338–347 (2024).
Google Scholar
Yang, Y. et al. Decoupling the air sensitivity of Na-layered oxides. Science 385, 744–752 (2024).
Google Scholar
Zhao, C. et al. Rational design of layered oxide materials for sodium-ion batteries. Science 370, 708–711 (2020). This article introduces the concept of cation potential to design P2-layered and O3-layered oxide materials.
Google Scholar
Rong, X. et al. Anionic redox reaction-induced high-capacity and low-strain cathode with suppressed phase transition. Joule 3, 503–517 (2019).
Google Scholar
Han, M. H., Gonzalo, E., Singh, G. & Rojo, T. A comprehensive review of sodium layered oxides: powerful cathodes for Na-ion batteries. Energy Environ. Sci. 8, 81–102 (2015).
Google Scholar
Guo, Y.-J. et al. Sodium layered oxide cathodes: properties, practicality and prospects. Chem. Soc. Rev. 53, 7828–7874 (2024).
Google Scholar
Hwang, J.-Y., Myung, S.-T. & Sun, Y.-K. Sodium-ion batteries: present and future. Chem. Soc. Rev. 46, 3529–3614 (2017).
Google Scholar
Delmas, C. Sodium and sodium-ion batteries: 50 years of research. Adv. Energy Mater. 8, 1703137 (2018).
Google Scholar
Mishra, N., Boral, R. & Paul, T. Designing layered oxides as cathodes for sodium-ion batteries: machine learning and density functional theory based modeling. Mater. Today Phys. 51, 101634 (2025).
Google Scholar
Cai, C. et al. Transition metal vacancy and position engineering enables reversible anionic redox reaction for sodium storage. Nat. Commun. 16, 100 (2025). This article proposes a strategy for Mg ion and vacancy dual doping with partial transition metal ions pinned in Na layers, which simultaneously improves the oxygen redox activity and structural stability.
Google Scholar
Li, Y. et al. Competing mechanisms determine oxygen redox in doped Ni–Mn based layered oxides for Na-ion batteries. Adv. Mater. 36, 2309842 (2024).
Google Scholar
Sada, K., Kmiec, S. & Manthiram, A. Mitigating sodium ordering for enhanced solid solution behavior in layered NaNiO2 cathodes. Angew. Chem. Int. Ed. 63, e202403865 (2024).
Google Scholar
Yu, Y. et al. Triggering reversible anion redox chemistry in O3-type cathodes by tuning Na/Mn anti-site defects. Energy Environ. Sci. 16, 584–597 (2023).
Google Scholar
Gabriel, E. et al. Influence of interlayer cation ordering on Na transport in P2-type Na0.67–xLiyNi0.33–zMn0.67+zO2 for sodium-ion batteries. J. Am. Chem. Soc. 146, 15108–15118 (2024).
Google Scholar
Jiang, N. et al. Surface gradient desodiation chemistry in layered oxide cathode materials. Angew. Chem. Int. Ed. 63, e202410080 (2024). This article proposes a surface gradient desodiation strategy to enhance reversibility, effectively constraining surface transition metal ion migration.
Google Scholar
Tang, A. et al. Ligand-to-metal charge transfer motivated the whole-voltage-range anionic redox in P2-type layered oxide cathodes. Adv. Funct. Mater. 34, 2402639 (2024).
Google Scholar
Mao, Q. et al. A unique wide-spacing fence-type superstructure for robust high-voltage O3-type sodium layered cathode. Angew. Chem. Int. Ed. 63, e202404330 (2024).
Google Scholar
Rong, X. et al. Boosting reversible anionic redox reaction with Li/Cu dual honeycomb centers. eScience 3, 100159 (2023).
Google Scholar
Yu, Y. et al. Ribbon-ordered superlattice enables reversible anion redox and stable high-voltage Na-ion battery cathodes. J. Am. Chem. Soc. 146, 22220–22235 (2024). This article designs high-voltage NaLi0.1Ni0.35Mn0.3Ti0.25O2 cathode with a ribbon-ordered superlattice and explores intrinsic coupling mechanism between structure evolution and anion redox reaction.
Google Scholar
Peng, B. et al. Recent progress in the emerging modification strategies for layered oxide cathodes toward practicable sodium ion batteries. Adv. Energy Mater. 13, 2300334 (2023).
Google Scholar
Zhang, H. et al. Long-cycle-life cathode materials for sodium-ion batteries toward large-scale energy storage systems. Adv. Energy Mater. 13, 2300149 (2023).
Google Scholar
Jia, X. B. et al. Facilitating layered oxide cathodes based on orbital hybridization for sodium-ion batteries: marvelous air stability, controllable high voltage, and anion redox chemistry. Adv. Mater. 36, 2307938 (2024).
Google Scholar
Gao, H. et al. Revealing the potential and challenges of high-entropy layered cathodes for sodium-based energy storage. Adv. Energy Mater. 14, 2304529 (2024).
Google Scholar
Wang, J. et al. Routes to high-performance layered oxide cathodes for sodium-ion batteries. Chem. Soc. Rev. 53, 4230–4301 (2024).
Google Scholar
Braconnier, J.-J., Delmas, C., Fouassier, C. & Hagenmuller, P. Comportement electrochimique des phases NaxCoO2. Mater. Res. Bull. 15, 1797–1804 (1980).
Google Scholar
Fouassier, C., Delmas, C. & Hagenmuller, P. Evolution structurale et proprietes physiques des phases AxMO2 (A = Na, K; M = Cr, Mn, Co) (x ≤ 1). Mater. Res. Bull. 10, 443–449 (1975).
Google Scholar
Delmas, C., Fouassier, C. & Hagenmuller, P. Structural classification and properties of the layered oxides. Phys. B+C 99, 81–85 (1980). This article categorizes the structure of layered oxides.
Google Scholar
Jacobsson, T. J., Pazoki, M., Hagfeldt, A. & Edvinsson, T. Goldschmidt’s rules and strontium replacement in lead halogen perovskite solar cells: theory and preliminary experiments on CH3NH3SrI3. J. Phys. Chem. C 119, 25673–25683 (2015).
Google Scholar
Tosun, S. G., Uzun, D. & Yeşilot, S. Novel K+-doped Na0.6Mn0.35Fe0.35Co0.3O2 cathode materials for sodium-ion batteries: synthesis, structures, and electrochemical properties. J. Solid State Electrochem. 25, 1271–1281 (2021).
Google Scholar
Zhang, X.-Y. et al. Expediting layered oxide cathodes based on electronic structure engineering for sodium-ion batteries: reversible phase transformation, abnormal structural regulation, and stable anionic redox. Nano Energy 128, 109905 (2024).
Google Scholar
Zhang, Q. et al. Mitigating the voltage fading and air sensitivity of O3-type NaNi0.4Mn0.4Cu0.1Ti0.1O2 cathode material via La doping. Chem. Eng. J. 431, 133456 (2022).
Google Scholar
Li, P. et al. Investigation of cation doping on the structure and electrochemical properties of K0.5MnO2 cathode materials based on first-principles calculation. J. Energy Storage 98, 113042 (2024).
Google Scholar
Zhang, K. et al. Manganese based layered oxides with modulated electronic and thermodynamic properties for sodium ion batteries. Nat. Commun. 10, 5203 (2019).
Google Scholar
Kim, D., Cho, M. & Cho, K. Rational design of NaLi1/3Mn2/3O2 operated by anionic redox reactions for advanced sodium-ion batteries. Adv. Mater. 29, 1701788 (2017).
Google Scholar
You, Y. & Yuan, M. Theoretical study on the synergistic mechanism of Fe–Mn in sodium-ion batteries. Particuology 93, 284–290 (2024).
Google Scholar
Ma, Y. et al. High-entropy energy materials: challenges and new opportunities. Energy Environ. Sci. 14, 2883–2905 (2021).
Google Scholar
Hsu, W.-L., Tsai, C.-W., Yeh, A.-C. & Yeh, J.-W. Clarifying the four core effects of high-entropy materials. Nat. Rev. Chem. 8, 471–485 (2024).
Google Scholar
Fu, F. et al. Entropy and crystal-facet modulation of P2-type layered cathodes for long-lasting sodium-based batteries. Nat. Commun. 13, 2826 (2022).
Google Scholar
Liu, S. et al. A high-entropy engineering on sustainable anionic redox Mn-based cathode with retardant stress for high-rate sodium-ion batteries. Angew. Chem. Int. Ed. 64, e202421089 (2025). This article demonstrates that robust lattice with high-entropy framework considerably improves structural integrity and reduces the formation of intragranular fractures.
Google Scholar
Wang, H. et al. Halting oxygen evolution to achieve long cycle life in sodium layered cathodes. Angew. Chem. Int. Ed. 64, e202418605 (2025).
Google Scholar
Hao, D. et al. Design of high-entropy P2/O3 hybrid layered oxide cathode material for high-capacity and high-rate sodium-ion batteries. Nano Energy 125, 109562 (2024).
Google Scholar
Berthelot, R., Carlier, D. & Delmas, C. Electrochemical investigation of the P2–NaxCoO2 phase diagram. Nat. Mater. 10, 74–80 (2011).
Google Scholar
Li, M. et al. Thermodynamically stable low-Na O3 cathode materials driven by intrinsically high ionic potential discrepancy. Energy Environ. Sci. 17, 7058–7068 (2024).
Google Scholar
Risthaus, T. et al. P3 Na0.9Ni0.5Mn0.5O2 cathode material for sodium ion batteries. Chem. Mater. 31, 5376–5383 (2019).
Google Scholar
Xu, G.-L. et al. Insights into the structural effects of layered cathode materials for high voltage sodium-ion batteries. Energy Environ. Sci. 10, 1677–1693 (2017).
Google Scholar
Azambou, C. I. et al. Electrochemical performance and structural evolution of layered oxide cathodes materials for sodium-ion batteries: a review. J. Energy Storage 94, 112506 (2024).
Google Scholar
Bianchini, M. et al. The interplay between thermodynamics and kinetics in the solid-state synthesis of layered oxides. Nat. Mater. 19, 1088–1095 (2020).
Google Scholar
Wang, C. et al. Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery. Nat. Commun. 12, 2256 (2021). This article reveals the effects of Sb on the microstructure and coordination environment and elucidates the structural evolution during repeated Na+ extraction and insertion.
Google Scholar
Huang, Z.-X. et al. Hollow Na0.62K0.05Mn0.7Ni0.2Co0.1O2 polyhedra with exposed stable {001} facets and K riveting for sodium-ion batteries. Sci. China Mater. 66, 79–87 (2022).
Google Scholar
Wu, Z. et al. Realizing high capacity and zero strain in layered oxide cathodes via lithium dual-site substitution for sodium-ion batteries. J. Am. Chem. Soc. 145, 9596–9606 (2023).
Google Scholar
Yan, L. et al. Dual-site doping in transition metal oxide cathode enables high-voltage stability of Na-ion batteries. Small 20, 2401915 (2024).
Google Scholar
Sun, L. et al. Insight into Ca-substitution effects on O3-type NaNi1/3Fe1/3Mn1/3O2 cathode materials for sodium-ion batteries application. Small 14, e1704523 (2018).
Google Scholar
Huang, W. et al. Ba-doped Na0.16MnO2 with ultra-long cycling life and highly reversible insertion/extraction mechanism for aqueous rechargeable sodium ion batteries. J. Energy Storage 98, 112983 (2024).
Google Scholar
Zhang, X. et al. Mitigating the Jahn–Teller distortion and phase transition in the P2-Na0.67Ni0.33Mn0.67O2 cathode through large Sr2+ ion substitution for improved performance. J. Mater. Chem. A 12, 19440–19451 (2024).
Google Scholar
Li, X. et al. Internal vanadium doping and external modification design of P2-type layered Mn-based oxides as competitive cathodes toward sodium-ion batteries. Chem. Eur. J. 30, e202400088 (2024).
Google Scholar
Xi, K. et al. A high-performance layered Cr-based cathode for sodium-ion batteries. Nano Energy 67, 104215 (2020).
Google Scholar
Jia, S. et al. Chemical speed dating: the impact of 52 dopants in Na–Mn–O cathodes. Chem. Mater. 34, 11047–11061 (2022). This article elucidates the impact of dopants on layered structure and investigates how different dopants influence the battery performance.
Google Scholar
Zhang, L. et al. Suppressing interlayer-gliding and Jahn–Teller effect in P2-type layered manganese oxide cathode via Mo doping for sodium-ion batteries. Chem. Eng. J. 426, 130813 (2021).
Google Scholar
Zhao, H. et al. Rare earth incorporated electrode materials for advanced energy storage. Coord. Chem. Rev. 390, 32–49 (2019).
Google Scholar
Kumar, K. & Kundu, R. Doping engineering in electrode material for boosting the performance of sodium ion batteries. ACS Appl. Mater. Interfaces 16, 37346–37362 (2024).
Google Scholar
Feng, L. et al. La-doped O3-type layered oxide cathode with enhanced cycle stability for sodium-ion batteries. Chem. Eng. J. 496, 154298 (2024).
Google Scholar
Jia, X.-B. et al. Facilitating layered oxide cathodes based on orbital hybridization for sodium-ion batteries: marvelous air stability, controllable high voltage, and anion redox chemistry. Adv. Mater. 36, 2307938 (2024).
Google Scholar
Zhang, G. et al. Suppressed P2–P2’ phase transition of Fe/Mn-based layered oxide cathode for high-performance sodium-ion batteries. Energy Storage Mater. 51, 559–567 (2022).
Google Scholar
Li, J. et al. The effect of Sn substitution on the structure and oxygen activity of Na0.67Ni0.33Mn0.67O2 cathode materials for sodium ion batteries. J. Power Sources 449, 227554 (2020).
Google Scholar
Yuan, T. et al. A high-rate, durable cathode for sodium-ion batteries: Sb-doped O3-type Ni/Mn-based layered oxides. ACS Nano 16, 18058–18070 (2022). This article reveals the effects of Sb on the microstructure and coordination environment and elucidates the structural evolution during repeated Na+ extraction and insertion.
Google Scholar
Min, K. Dual doping with cations and anions for enhancing the structural stability of the sodium-ion layered cathode. Phys. Chem. Chem. Phys. 24, 13006–13014 (2022).
Google Scholar
Wang, X. et al. In-plane BO3 configuration in P2 layered oxide enables outstanding long cycle performance for sodium ion batteries. Small Methods 7, 2201201 (2022).
Google Scholar
Nie, R., Chen, H., Yang, Y., Li, C. & Zhou, H. High-voltage layered manganese-based oxide cathode with excellent rate capability enabled by K/F co-doping. ACS Appl. Energy Mater. 6, 2358–2369 (2023).
Google Scholar
Nie, Z. et al. Constructing multiphase junction towards layer-structured cathode material for enhanced sodium ion batteries. Energy Storage Mater. 74, 103971 (2025).
Google Scholar
Matsui, M., Mizukoshi, F., Hasegawa, H. & Imanishi, N. Ca-substituted P3-type NaxNi1/3Mn1/3Co1/3O2 as a potential high voltage cathode active material for sodium-ion batteries. J. Power Sources 485, 229346 (2021).
Google Scholar
Yu, T.-Y. et al. High-energy O3-Na1−2xCax[Ni0.5Mn0.5]O2 cathodes for long-life sodium-ion batteries. J. Mater. Chem. A 8, 13776–13786 (2020).
Google Scholar
Maurya, D. et al. High valent cation/anion co-doped O3 NaNiO2 high performing cathode for sodium battery. Comput. Condens. Matter 42, e01000 (2025).
Google Scholar
Guo, Y.-J. et al. Boron-doped sodium layered oxide for reversible oxygen redox reaction in Na-ion battery cathodes. Nat. Commun. 12, 5267 (2021).
Google Scholar
Yang, L. et al. A co- and Ni-free P2/O3 biphasic lithium stabilized layered oxide for sodium-ion batteries and its cycling behavior. Adv. Funct. Mater. 30, 2003364 (2020).
Google Scholar
Chen, C. et al. P2/O3 biphasic Fe/Mn-based layered oxide cathode with ultrahigh capacity and great cyclability for sodium ion batteries. Nano Energy 90, 106504 (2021).
Google Scholar
Wang, Y. et al. Completely suppressed high-voltage phase transition of P2/O3-Na0.7Li0.1Ni0.1Fe0.2Mn0.6O2 via Li/Ni co-doping for sodium storage. Inorg. Chem. Front. 9, 5231–5239 (2022).
Google Scholar
Zhang, Y. et al. P2/O3 biphasic cathode material through magnesium substitution for sodium-ion batteries. ACS Appl. Mater. Interfaces 16, 11349–11360 (2024).
Google Scholar
Zhang, T. et al. Insights into chemical-mechanical degradation and modification strategies of layered oxide cathode materials of sodium ion batteries. J. Energy Chem. 103, 294–315 (2025).
Google Scholar
DiLecce, D. et al. Degradation of layered oxide cathode in a sodium battery: a detailed investigation by X-ray tomography at the nanoscale. Small Methods 5, 2100596 (2021).
Google Scholar
Chu, S. et al. Pinning effect enhanced structural stability toward a zero-strain layered cathode for sodium-ion batteries. Angew. Chem. Int. Ed. 60, 13366–13371 (2021).
Google Scholar
Wang, Q.-C. et al. Tuning P2-structured cathode material by Na-site Mg substitution for Na-ion batteries. J. Am. Chem. Soc. 141, 840–848 (2019).
Google Scholar
House, R. A. et al. Superstructure control of first-cycle voltage hysteresis in oxygen-redox cathodes. Nature 577, 502–508 (2020).
Google Scholar
Eum, D. et al. Coupling structural evolution and oxygen-redox electrochemistry in layered transition metal oxides. Nat. Mater. 21, 664–672 (2022).
Google Scholar
Mao, Q. et al. Mitigating the P2–O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction. J. Mater. Chem. A 9, 10803–10811 (2021).
Google Scholar
Kubota, K., Asari, T. & Komaba, S. Impact of Ti and Zn dual-substitution in P2 type Na2/3Ni1/3Mn2/3O2 on Ni–Mn and Na-vacancy ordering and electrochemical properties. Adv. Mater. 35, 2300714 (2023).
Google Scholar
Wang, P.-F. et al. Na+/vacancy disordering promises high-rate Na-ion batteries. Sci. Adv. 4, eaar6018 (2018).
Google Scholar
Voronina, N. et al. Unveiling the role of ruthenium in layered sodium cobaltite toward high-performance electrode enabled by anionic and cationic redox. Adv. Energy Mater. 13, 2302017 (2023).
Google Scholar
Jin, J. et al. Annealing in argon universally upgrades the Na-storage performance of Mn-based layered oxide cathodes by creating bulk oxygen vacancies. Angew. Chem. Int. Ed. 62, e202219230 (2023).
Google Scholar
Wang, Q. et al. Reaching the energy density limit of layered O3-NaNi0.5Mn0.5O2 electrodes via dual Cu and Ti substitution. Adv. Energy Mater. 9, 1901785 (2019).
Google Scholar
Gao, L. et al. Stable layered oxide cathode materials with ultra-low volume change for high-performance sodium-ion batteries. Chem. Eng. J. 510, 161580 (2025).
Google Scholar
Huang, Y. et al. Negative enthalpy doping stabilizes P2-type oxides cathode for high-performance sodium-ion batteries. Adv. Mater. 37, 2408012 (2025).
Google Scholar
Peng, X. et al. Promoting threshold voltage of P2-Na0.67Ni0.33Mn0.67O2 with Cu2+ cation doping toward high-stability cathode for sodium-ion battery. J. Colloid Interface Sci. 659, 422–431 (2024).
Google Scholar
Peng, B. et al. A customized strategy realizes stable cycle of large-capacity and high-voltage layered cathode for sodium-ion batteries. Angew. Chem. Int. Ed. 63, e202411618 (2024).
Google Scholar
Dong, M. et al. Electrochemically active element Cu/Fe enhances P2 Ni/Mn-based materials by pushing up the phase transition voltage and improving Na+ transport kinetics. J. Energy Storage 141, 119320 (2026).
Google Scholar
Ren, H. et al. Impurity-vibrational entropy enables quasi-zero-strain layered oxide cathodes for high-voltage sodium-ion batteries. Nano Energy 103, 107765 (2022).
Google Scholar
Ding, F. et al. Tailoring planar strain for robust structural stability in high-entropy layered sodium oxide cathode materials. Nat. Energy 9, 1529–1539 (2024).
Google Scholar
Huang, Z.-X. et al. Multifunctional and radii-matched high-entropy engineering toward locally-regulable metal oxide layers in sodium-layered oxide cathode. Angew. Chem. Int. Ed. 64, e202505367 (2025).
Google Scholar
Ni, Q., Zhao, Y., Yuan, X., Li, J. & Jin, H. Dual-function of cation-doping to activate cationic and anionic redox in a Mn-based sodium-layered oxide cathode. Small 18, 2200289 (2022).
Google Scholar
Leng, M. et al. A new perspective on the composition–structure–property relationships on Nb/Mo/Cr-doped O3-type layered oxide as cathode materials for sodium-ion batteries. Chem. Eng. J. 413, 127824 (2021).
Google Scholar
Koo, C. et al. Extending nonhysteretic oxygen capacity in P2-type Ni–Mn binary Na oxides. Chem. Eng. J. 446, 137429 (2022).
Google Scholar
Ding, F. et al. Tailoring electronic structure to achieve maximum utilization of transition metal redox for high-entropy Na layered oxide cathodes. J. Am. Chem. Soc. 145, 13592–13602 (2023).
Google Scholar
Wang, P.-F. et al. Both cationic and anionic redox chemistry in a P2-type sodium layered oxide. Nano Energy 69, 104474 (2020).
Google Scholar
Zhao, C. et al. Revealing high Na-content P2-type layered oxides as advanced sodium-ion cathodes. J. Am. Chem. Soc. 142, 5742–5750 (2020).
Google Scholar
Ben Yahia, M., Vergnet, J., Saubanère, M. & Doublet, M.-L. Unified picture of anionic redox in Li/Na-ion batteries. Nat. Mater. 18, 496–502 (2019).
Google Scholar
Ren, H. et al. Unraveling anionic redox for sodium layered oxide cathodes: breakthroughs and perspectives. Adv. Mater. 34, 2106171 (2022).
Google Scholar
Yabuuchi, N. et al. A new electrode material for rechargeable sodium batteries: P2-type Na0.67[Mg0.28Mn0.72]O2 with anomalously high reversible capacity. J. Mater. Chem. A 2, 16851–16855 (2014).
Google Scholar
Ma, C. et al. Exploring oxygen activity in the high energy P2-type Na0.78Ni0.23Mn0.69O2 cathode material for Na-ion batteries. J. Am. Chem. Soc. 139, 4835–4845 (2017).
Google Scholar
Maitra, U. et al. Oxygen redox chemistry without excess alkali-metal ions in Na2/3[Mg0.28Mn0.72]O2. Nat. Chem. 10, 288–295 (2018). This article proposes ribbon superstructure to enhance reversibility, effectively suppressing transition metal migration.
Google Scholar
Zhang, M. et al. Pushing the limit of 3d transition metal-based layered oxides that use both cation and anion redox for energy storage. Nat. Rev. Mater. 7, 522–540 (2022).
Google Scholar
Tamaru, M., Wang, X., Okubo, M. & Yamada, A. Layered Na2RuO3 as a cathode material for Na-ion batteries. Electrochem. Commun. 33, 23–26 (2013).
Google Scholar
Rozier, P. et al. Anionic redox chemistry in Na-rich Na2Ru1−ySnyO3 positive electrode material for Na-ion batteries. Electrochem. Commun. 53, 29–32 (2015).
Google Scholar
Mortemard de Boisse, B. et al. Intermediate honeycomb ordering to trigger oxygen redox chemistry in layered battery electrode. Nat. Commun. 7, 11397 (2016).
Google Scholar
Perez, A. J. et al. Strong oxygen participation in the redox governing the structural and electrochemical properties of Na-rich layered oxide Na2IrO3. Chem. Mater. 28, 8278–8288 (2016).
Google Scholar
Tang, Y. et al. Sustainable layered cathode with suppressed phase transition for long-life sodium-ion batteries. Nat. Sustain. 7, 348–359 (2024).
Google Scholar
Wang, Q. et al. Unlocking anionic redox activity in O3-type sodium 3d layered oxides via Li substitution. Nat. Mater. 20, 353–361 (2021).
Google Scholar
Dong, H. et al. Lithium orbital hybridization chemistry to stimulate oxygen redox with reversible phase evolution in sodium-layered oxide cathodes. J. Am. Chem. Soc. 146, 22335–22347 (2024).
Google Scholar
Risthaus, T. et al. A high-capacity P2 Na2/3Ni1/3Mn2/3O2 cathode material for sodium ion batteries with oxygen activity. J. Power Sources 395, 16–24 (2018).
Google Scholar
Abate, I. et al. The role of metal substitution in tuning anion redox in sodium metal layered oxides revealed by X-ray spectroscopy and theory. Angew. Chem. Int. Ed. 60, 10880–10887 (2021).
Google Scholar
Tanibata, N., Kondo, S., Akatsuka, S., Takeda, H. & Nakayama, M. Fast anion redox by amorphization in sodium-ion batteries. Chem. Mater. 37, 303–312 (2025).
Google Scholar
Zhao, C. et al. Decreasing transition metal triggered oxygen redox activity in Na-deficient oxides. Energy Storage Mater. 20, 395–400 (2019).
Google Scholar
Hong, J. et al. Metal–oxygen decoordination stabilizes anion redox in Li-rich oxides. Nat. Mater. 18, 256–265 (2019).
Google Scholar
Vergnet, J., Saubanère, M., Doublet, M.-L. & Tarascon, J.-M. The structural stability of P2-layered Na-based electrodes during anionic redox. Joule 4, 420–434 (2020).
Google Scholar
Hu, C. et al. Harvesting sustainable and low-hysteresis anion redox chemistry in Na layered oxide cathodes through mild ligand-to-metal charge transfer. Chem. Eng. J. 506, 160380 (2025).
Google Scholar
Jian, Z.-C. et al. Accelerating lattice oxygen kinetics of layered oxide cathodes via active facet modulation and robust mechanochemical interface construction for high-energy-density sodium-ion batteries. Energy Environ. Sci. 18, 7995–8008 (2025).
Google Scholar
Li, F., Liu, R., Liu, J. & Li, H. Voltage hysteresis in transition metal oxide cathodes for Li/Na-ion batteries. Adv. Funct. Mater. 33, 2300602 (2023).
Google Scholar
Singh, P. & Dixit, M. Stabilizing anionic redox and tuning its extent in Na-rich cathode materials through electronic structure engineering. J. Phys. Chem. C 128, 8883–8893 (2024).
Google Scholar
Zhao, C. et al. Anionic redox reaction in Na-deficient layered oxide cathodes: role of Sn/Zr substituents and in-depth local structural transformation revealed by solid-state NMR. Energy Storage Mater. 39, 60–69 (2021).
Google Scholar
Zhou, J. et al. Titanium substitution facilitating oxygen and manganese redox in sodium layered oxide cathode. Adv. Mater. Interfaces 11, 2400190 (2024).
Google Scholar
Yu, Y. et al. Revealing the anionic redox chemistry in O3-type layered oxide cathode for sodium-ion batteries. Energy Storage Mater. 38, 130–140 (2021).
Google Scholar
Shi, Q. et al. Niobium-doped layered cathode material for high-power and low-temperature sodium-ion batteries. Nat. Commun. 13, 3205 (2022).
Google Scholar
Lu, W., zhao, H., Soomro, R. A., Sun, N. & Xu, B. Lattice sulfuration enhanced sodium storage performance of Na0.9Li0.1Zn0.05Ni0.25Mn0.6O2 cathode. Chem. Eng. J. 501, 157663 (2024).
Google Scholar
Li, X.-L. et al. Stabilizing transition metal vacancy induced oxygen redox by Co2+/Co3+ redox and sodium-site doping for layered cathode materials. Angew. Chem. Int. Ed. 60, 22026–22034 (2021).
Google Scholar
Zeng, A. et al. Clarifying effects of in-plane cationic-ordering degree on anionic redox chemistry in Na-ion battery layered oxide cathodes. Mater. Today Chem. 30, 101532 (2023).
Google Scholar
Li, M. et al. Correlation of oxygen anion redox activity to in-plane honeycomb cation ordering in NaxNiyMn1−yO2 cathodes. Adv. Energy Sustain. Res. 3, 2200027 (2022).
Google Scholar
Gao, A. et al. Topologically protected oxygen redox in a layered manganese oxide cathode for sustainable batteries. Nat. Sustain. 5, 214–224 (2022). This paper investigates the topological protection for the reversibility of lattice oxygen redox in P3-layered oxide.
Google Scholar
Wang, Q. et al. Dual honeycomb-superlattice enables double-high activity and reversibility of anion redox for sodium-ion battery layered cathodes. Angew. Chem. Int. Ed. 61, e202206625 (2022).
Google Scholar
Bhange, D. S. et al. Honeycomb-layer structured Na3Ni2BiO6 as a high voltage and long life cathode material for sodium-ion batteries. J. Mater. Chem. A 5, 1300–1310 (2017).
Google Scholar
Ma, J. et al. Ordered and disordered polymorphs of Na(Ni2/3Sb1/3)O2: honeycomb-ordered cathodes for Na-ion batteries. Chem. Mater. 27, 2387–2399 (2015).
Google Scholar
Li, Q. et al. A superlattice-stabilized layered oxide cathode for sodium-ion batteries. Adv. Mater. 32, 1907936 (2020).
Google Scholar
Kang, S., Lee, S., Lee, H. & Kang, Y.-M. Manipulating disorder within cathodes of alkali-ion batteries. Nat. Rev. Chem. 8, 587–604 (2024).
Google Scholar
Han, Y. et al. Uncovering the predictive pathways of lithium and sodium interchange in layered oxides. Nat. Mater. 23, 951–959 (2024). This article establishes predictive compositional and structural evolution at extremely dilute and low excess lithium based on the phase equilibrium between Li0.94CoO2 and Na0.48CoO2.
Google Scholar
Deng, Z., Mo, Y. & Ong, S. P. Computational studies of solid-state alkali conduction in rechargeable alkali-ion batteries. NPG Asia Mater. 8, e254 (2016).
Google Scholar
Ding, F. et al. A novel Ni-rich O3-Na[Ni0.60Fe0.25Mn0.15]O2 cathode for Na-ion batteries. Energy Storage Mater. 30, 420–430 (2020).
Google Scholar
Guo, S. et al. Understanding sodium-ion diffusion in layered P2 and P3 oxides via experiments and first-principles calculations: a bridge between crystal structure and electrochemical performance. NPG Asia Mater. 8, e266 (2016).
Google Scholar
Li, M. et al. Unravelling the structure–stability interplay of O3-type layered sodium cathode materials via precision spacing engineering. Nat. Commun. 16, 2010 (2025).
Google Scholar
Tie, D. et al. Modulating the interlayer spacing and Na+/vacancy disordering of P2-Na0.67MnO2 for fast diffusion and high-rate sodium storage. ACS Appl. Mater. Interfaces 11, 6978–6985 (2019).
Google Scholar
Lee, I. et al. Cationic and transition metal co-substitution strategy of O3-type NaCrO2 cathode for high-energy sodium-ion batteries. Energy Storage Mater. 41, 183–195 (2021).
Google Scholar
Liang, X., Hwang, J.-Y. & Sun, Y.-K. Practical cathodes for sodium-ion batteries: who will take the crown? Adv. Energy Mater. 13, 2301975 (2023).
Google Scholar
Oh, G. et al. Substitution of Sr into the Na layer elevates the high voltage stability of O3-type NaCrO2 as sodium-ion battery cathode. Small Struct. 6, 2400561 (2025).
Google Scholar
Gao, S. et al. Regulation of coordination chemistry for ultrastable layered oxide cathode materials of sodium-ion batteries. Adv. Mater. 36, 2311523 (2024).
Google Scholar
Liang, X. et al. High-energy and long-life O3-type layered cathode material for sodium-ion batteries. Nat. Commun. 16, 3505 (2025).
Google Scholar
Zuo, W. et al. Engineering Na+-layer spacings to stabilize Mn-based layered cathodes for sodium-ion batteries. Nat. Commun. 12, 4903 (2021).
Google Scholar
Liu, J. et al. Entropy tuning stabilizing P2-type layered cathodes for sodium-ion batteries. Adv. Funct. Mater. 34, 2315437 (2024).
Google Scholar
Ahmad, N. et al. Dual-pillar effect in P2-type Na0.67Ni0.33Mn0.67O2 through Na site substitution achieve superior electrochemical and air/water dual-stability as cathode for sodium-ion batteries. Adv. Energy Mater. 15, 2404093 (2025).
Google Scholar
Shi, Y. et al. Layered 3d transition metal-based oxides for sodium-ion and lithium-ion batteries: differences, links and beyond. Adv. Funct. Mater. 35, 2413078 (2025).
Google Scholar
Wang, Y. et al. Unexpected elevated working voltage by Na+/vacancy ordering and stabilized sodium-ion storage by transition-metal honeycomb ordering. Angew. Chem. Int. Ed. 63, e202409152 (2024).
Google Scholar
Zhang, T. et al. Promoting the performances of P2-type sodium layered cathode by inducing Na site rearrangement. Nano Energy 100, 107482 (2022).
Google Scholar
Jin, T. et al. Realizing complete solid-solution reaction in high sodium content P2-type cathode for high-performance sodium-ion batteries. Angew. Chem. Int. Ed. 59, 14511–14516 (2020).
Google Scholar
Huang, R. et al. Properties of rich-Nae effect and zero-phase transition in P2–Na0.67(Ni0.1Mn0.8Fe0.1)1–xMgxO2 cathodes for rapid and stable sodium storage. ACS Sustain. Chem. Eng. 12, 16759–16769 (2024).
Google Scholar
Ke, M. et al. Sodium-ion layered oxide cathode materials based on oxygen anion redox: mechanism study, voltage hysteresis, and air stability improvement. Mater. 6, 100480 (2025).
Ma, A. et al. Al-doped NaNi1/3Mn1/3Fe1/3O2 for high performance of sodium ion batteries. Ionics 26, 1797–1804 (2020).
Google Scholar
Han, M. H. et al. High-performance P2-phase Na2/3Mn0.8Fe0.1Ti0.1O2 cathode material for ambient-temperature sodium-ion batteries. Chem. Mater. 28, 106–116 (2016).
Google Scholar
Yabuuchi, N. et al. P2-type Nax[Fe1/2Mn1/2]O2 made from earth-abundant elements for rechargeable Na batteries. Nat. Mater. 11, 512–517 (2012).
Google Scholar
Somerville, J. W. et al. Nature of the ‘Z’-phase in layered Na-ion battery cathodes. Energy Environ. Sci. 12, 2223–2232 (2019). This article elucidates that the ‘Z’ is accurately described as a continuously changing intergrowth structure, which evolves from P2 to O2 via the OP4 structure as an intermediate structure.
Google Scholar
Zhang, X. et al. High-energy earth-abundant cathodes with enhanced cationic/anionic redox for sustainable and long-lasting Na-ion batteries. Adv. Mater. 36, 2310659 (2024).
Google Scholar
Wang, H. et al. Different effects of al substitution for Mn or Fe on the structure and electrochemical properties of Na0.67Mn0.5Fe0.5O2 as a sodium ion battery cathode material. Inorg. Chem. 57, 5249–5257 (2018).
Google Scholar
Chen, Z. et al. Triggering anionic redox activity in Fe/Mn-based layered oxide for high-performance sodium-ion batteries. Nano Energy 94, 106958 (2022).
Google Scholar
Zhou, P. et al. High-entropy P2/O3 biphasic cathode materials for wide-temperature rechargeable sodium-ion batteries. Energy Storage Mater. 57, 618–627 (2023).
Google Scholar
Zhao, C., Ding, F., Lu, Y., Chen, L. & Hu, Y.-S. High-entropy layered oxide cathodes for sodium-ion batteries. Angew. Chem. Int. Ed. 59, 264–269 (2020).
Google Scholar
Gauckler, C. et al. Detailed structural and electrochemical comparison between high potential layered P2-NaMnNi and doped P2-NaMnNiMg oxides. ACS Appl. Energy Mater. 5, 13735–13750 (2022).
Google Scholar
Xu, J. et al. Identifying the critical role of Li substitution in P2–Nax[LiyNizMn1–y–z]O2 (0 < x, y, z < 1) intercalation cathode materials for high-energy Na-ion batteries. Chem. Mater. 26, 1260–1269 (2014).
Google Scholar
Yang, L. et al. Structural aspects of P2-type Na0.67Mn0.6Ni0.2Li0.2O2 (MNL) stabilization by lithium defects as a cathode material for sodium-ion batteries. Adv. Funct. Mater. 31, 2102939 (2021).
Google Scholar
Mariyappan, S. et al. The role of divalent (Zn2+/Mg2+/Cu2+) substituents in achieving full capacity of sodium layered oxides for Na-ion battery applications. Chem. Mater. 32, 1657–1666 (2020).
Google Scholar
Yin, W. et al. P2-type layered oxide cathode with honeycomb-ordered superstructure for sodium-ion batteries. Energy Storage Mater. 69, 103424 (2024).
Google Scholar
Liu, Z. et al. Ultralow volume change of P2-type layered oxide cathode for Na-ion batteries with controlled phase transition by regulating distribution of Na+. Angew. Chem. Int. Ed. 60, 20960–20969 (2021).
Google Scholar
Wang, Q.-C. et al. Tuning sodium occupancy sites in P2-layered cathode material for enhancing electrochemical performance. Adv. Energy Mater. 11, 2003455 (2021).
Google Scholar
Liu, X. et al. Stabilizing interlayer repulsion in layered sodium-ion oxide cathodes via hierarchical layer modification. Adv. Mater. 36, 2407519 (2024).
Google Scholar
Huang, Z. et al. High-entropy layered oxide cathode materials with moderated interlayer spacing and enhanced kinetics for sodium-ion batteries. Adv. Mater. 36, 2410857 (2024).
Google Scholar
Shi, Y. et al. Sustainable anionic redox by inhibiting Li cross-layer migration in Na-based layered oxide cathodes. ACS Nano 18, 5609–5621 (2024).
Google Scholar
Ding, F. et al. Using high-entropy configuration strategy to design Na-ion layered oxide cathodes with superior electrochemical performance and thermal stability. J. Am. Chem. Soc. 144, 8286–8295 (2022).
Google Scholar
Li, Q. et al. Elucidating thermal decomposition kinetic mechanism of charged layered oxide cathode for sodium-ion batteries. Adv. Mater. 37, 2415610 (2025).
Google Scholar
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