锂离子电池富镍三元正极材料研究进展

Research progress of Ni-rich ternary cathode materials for lithium ion batteries

作为锂离子电池正极材料,富镍三元材料Li(Ni,Co,Mn)O2(NCM)具有较高的可逆容量、结构稳定性、热稳定性,成为电动汽车领域最具前景的锂离子电池正极材料之一。本文在综述三元正极材料结构基础上,总结Ni-Co-Mn比例对正极材料放电比容量、热稳定性和容量保持率的影响,指出当前富镍三元正极材料是三元正极的重要发展方向,并综述目前富镍三元正极材料存在的主要问题,及其合成方法、掺杂改性与表面改性的研究进展,最后对富镍三元正极材料的发展前景进行了评价和展望。

As a cathode material of lithium ion battery, high nickel ternary materials Li（Ni,Co,Mn）O2 （NCM） have advantages of high reversible capacity, structural stability, thermal stability and relatively low cost, so they are becoming one of the most promising lithium ion battery cathode material in electric vehicles. In this paper, the structure of the high-nickel ternary cathode material is reviewed, and the effects of Ni-Co-Mn ratio on the discharge capacity, thermal stability and capacity retention rate are summarized. The current nickel-rich ternary cathode material is an important development direction of ternary cathode materials. The main problems of the nickel-rich ternary cathode materials are pointed out, and the synthesis methods, electrochemical performances, doping-modification and surface-modification of the high nickel ternary materials are reviewed. Finally their application prospects are evaluated and prospected.