三元正极材料的复合改性研究进展

Progress on compound modification of ternary cathode materials

富镍层状金属氧化物镍钴铝酸锂/镍钴锰酸锂(NCA/NCM)是一种很有前途的锂离子电池正极材料。循环过程中界面不稳定、体结构退化和电极/电解质界面的副反应导致的容量快速衰退阻碍了其更大规模的商业应用。通过掺杂可以抑制阳离子混排和结构畸变,表面包覆可以保护粒子表面,抑制副反应,联合改性策略可以增强材料整体结构的稳定性,使材料具有良好的循环性能。据此,综述了近年来对富镍三元层状金属氧化物正极材料的复合改性研究进展,并阐述了改性的部分机理,最后对富镍层状金属氧化物正极材料的发展前景做了展望。

Nickel-rich layered metal oxide lithium nickel cobalt aluminate/lithium nickel cobalt manganese(NCA/NCM)is a promising cathode material for lithium-ion batteries.Interfacial instability during cycling,bulk structure degradation,and rapid capacity degradation resulting from side reactions at the electrode/electrolyte interface have hampered its larger-scale commercial applications.Cation mixing and structural degradation can be inhibited by doping,surface coating can protect the particle surface and inhibit the side reactions,and the collaborative modification strategy can enhance the stability of the overall structure of the material,endowing the material with good cycling properties.Accordingly,the research progress of composite modification of nickel-rich ternary layered metal oxide cathode materials in recent years was summarized,and the mechanism of modification was described.Finally,the development prospect of nickel-rich layered metal oxide cathode materials was discussed.