锂离子电池正极材料锰酸锂掺杂改性研究进展

Research progress in ion doping of LiMn_2O_4 cathode material for LIBs

锰酸锂(LiMn_2O_4)正极材料具有比容量高、工作电压高、成本低、环境友好和安全无毒等优点,是一种有很大发展潜力的锂离子电池正极材料之一。但是,由于Jahn-Teller效应引起的结构畸变,使锰酸锂正极材料的结构遭到破坏,导致其循环稳定性差。针对其不足之处,众多研究者对其进行掺杂改性,以期改善锰酸锂的循环性能,并取得了一系列成果。详细论述了近年来通过锂位、锰位、氧位掺杂和复合掺杂等离子掺杂来改善锰酸锂正极材料循环性能的方法。提出,采用阴阳离子复合掺杂来改善锰酸锂正极材料的性能,可在有效提高材料循环稳定性的基础上进一步提高材料的容量,被认为是提高锰酸锂综合电化学性能的有效手段。

LiMn_2O_4 is one of promising cathode materials for lithium ion batteries for its high specific capacity,high working voltage,low-cost,environment amicableness and safety etc..However,LiMn_2O_4 cathode material displays interior cycling performance due to Jahn-Teller distortion,resulting in structural damages.For its shortcomings,many researchers used doping modification method,in order to improve the cycle performance of LiMn_2O_4,and a series of achievements were obtained.The research progress in doping modification of LiMn_2O_4 cathode material for LIBs and their effects for improving the electrochemical performance of LiMn_2O_4 cathode material were discussed in detail.Finally,it was put forward that the ‘anion-cation multiple doping＇was being regarded as an effective way to improve the comprehensive electrochemical performance of LiMn_2O_4,which can further improve the material′s capacity,on the basis of effectively improve its cycle stability.