高镍系三元层状氧化物正极材料容量衰减机理的研究进展

Research Progress on the Capacity Fading Mechanisms of High-Nickel Ternary Layered Oxide Cathode Materials

高镍系三元层状氧化物正极材料因其高比容量、低廉的价格以及较好的环境友好性而受到广泛关注,但是其固有的一些缺点,如循环过程中结构稳定性差、高温稳定性差以及储存性能差等极大地限制了其在各领域的广泛应用。本文着重总结并讨论近年来对高镍系三元层状氧化物正极材料循环过程容量衰减机理的研究进展,并对高镍系三元层状氧化物正极材料的进一步改性作了简要的展望。

Owing to advantages of high specific capacity, low cost and environmental friendliness, high-nickel temary layered oxide cathode materials have received much attention and have been extensively studied over the past ten years. However, its further application is hindered by its structural instability during the cycling, thermal instability and poor storage properties. In order to provide references to tackle the problems that high nickel ternary layered oxide cathode materials faces, the degradation mechanisms of high-nickel ternary layered oxide cathode materials during cycling was summarized and discussed in this review. The degradation mechanisms are categorized as two major factors. One is thermodynamic factors including cation disorder as well as surface reactions, and the other is kinetic factors comprising of micro-cracks formation as well as rearrangement of conductive materials. The modification strategies corresponding to the major mechanisms and the research focusing on initial irreversible capacity loss are also briefly introduced.