TY - JOUR TI - A review of advanced Ni-based cathode materials with layered structures for sodium batteries JO - Energy Materials PY - 2026 VL - 6 IS - 8 SP - EP - 600106 SN - ISSN 2770-5900 (Online) AB -

Sodium-ion batteries (SIBs), benefiting from abundant sodium resources, cost-effectiveness, high safety, and environmental friendliness, are emerging as vital supplements to lithium-ion batteries (LIBs) in various fields, including electric vehicles, portable power sources, and stationary energy storage stations. The performance of SIBs largely hinges on cathode materials. Among them, Ni-based layered oxide cathode materials (Na1-δNixMyO2; M=Co, Mn, Al, Fe, and/or other elements; x + y = 1, y ≤ x ≤ 1; Ni-rich, 0.6 ≤ x ≤ 1) have exhibited distinctive advantages and enhancement potential due to the unique arrangement of Na and Ni ions within their layered structures. Na1-δNixMyO2 can significantly increase the specific discharge capacity by increasing the Ni content, which is of great significance for improving the energy density of SIBs. However, increasing the Ni content of Na1-δNixMyO2 also brings challenges, namely a decrease in structural stability, cycle durability, and thermal safety. In this paper, a comprehensive review is provided to understand the relationship between material structure and electrochemical performance. The degradation mechanism and modification strategies to further improve the performance and mitigate the degradation of SIB cathode materials of Ni-based cathodes such as Na1-δNixMyO2 are emphasized. This paper also analyzes the technical challenges and proposes future research directions to overcome them toward practical SIB applications.

KW - Sodium-ion batteries KW - Ni-based layered oxide cathode materials KW - structure KW - degradation mechanism KW - modification strategies DO - 10.20517/energymater.2026.68 UR - https://dx.doi.org/10.20517/energymater.2026.68