高能量密度锂离子电池层状锰基正极材料研究进展

层状锰基材料LiLix(MnM)1-x]O2(M=Ni,Co,Cr,…)以高比容量成为最具应用前景的正极体系之一,近年来成为研究热点而倍受关注,尤其借助原位测试分析等先进表征手段,对LiLix(MnM)1-x]O2的结构及其高容量获取机理的研究取得显著进展.本文概括介绍了高能量密度层状正极材料的结构与充放电机理,重点针对其目前依然存在的问题,详细归纳了LiLix(MnM)1-x]O2正极材料充放电循环过程中电压衰减机理、界面/表面特征以及性能改善的研究新进展,而且对高能量密度层状正极材料的未来研究方向也进行了探讨.

Research progress of layered Mn-based cathode materials for high-energy-density lithium-ion batteries

Layered Mn-based series LiLix(MnM)1-x]O2(M=Ni, Co, Cr,…) due to its much higher capacity is one of the very promising candidates of cathodes, which has become a research hotspot recently and attracted more and more attention. Especially, with the aid of advanced characterization techniques including in-situ analysis, studies on the complex structure and high-capacity delivering mechanism of the series have achieved significant progress. In the paper, the structural characterization and charge-discharge behavior of the high-energy density layered cathode were briefly introduced. Study progresses on the voltage degradation, interface/surface variation during cycling and performance improvements of LiLix(MnM)1-x]O2 were reviewed in detail particularly in view of its exiting issues. Furthermore, the challenges and prospects in the high-energy density layered cathode materials were also discussed herein.