磷酸锰铁锂正极材料离子掺杂改性的进展  

Progress in ion doping modification of lithium manganese iron phosphate cathode materials

作　　者：黄文莺 张贤碧 乐文峰 孟秀艳 张旗 唐有根[1] HUANG Wenying;ZHANG Xianbi;LE Wenfeng;MENG Xiuyan;ZHANG Qi;TANG Yougen(School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,Hunan,China;Peugeot Citroen(China)Automobile Trading Co.,Ltd.,Shanghai Branch,Shanghai 200030,China)

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]标致雪铁龙(中国)汽车贸易有限公司上海分公司,上海200030

出　　处：《电池》2025年第1期2-10,共9页Battery Bimonthly

基　　金：国家自然科学基金青年基金(22109181);湖南省自然科学基金青年基金(2022JJ40576)。

摘　　要：磷酸锰铁锂(LiMn_(x)Fe_(1-x)PO_(4),0<x<1,LMFP)作为可替代LiFePO_(4)(LFP)的正极材料,兼具LFP稳定、廉价、环保以及LiMnPO_(4)(LMP)工作电压高[4.1 V(vs.Li^(+)/Li)]、能量密度高的优点,商用前景广阔。电子/离子电导率低问题和Mn^(3+)的Jahn-Teller效应导致的结构不稳定等问题,制约了LMFP的实际应用。综述近年来LMFP材料的离子掺杂改性研究进展,从晶体结构角度分析LMFP性能不足的本质原因;进而总结Li位、Mn/Fe位、PO_(4)位及多位点掺杂的研究策略及作用机理;重点阐述不同掺杂策略如何通过调控晶体结构、优化电子/离子传输路径和抑制Jahn-Teller效应来提升LMFP的倍率性能和循环稳定性;最后,对LMFP掺杂改性研究中存在的问题和未来发展方向进行展望。Lithium manganese iron phosphate(LiMn_(x)Fe_(1-x)PO_(4),0<x<1,LMFP),as cathode material potentially replacing LiFePO_(4)(LFP),combines the advantages of LFP’s stability,cost-effectiveness and environmental friendliness with LiMnPO_(4)(LMP)’s high operating voltage[4.1 V(vs.Li+/Li)]and high energy density,shows great commercial prospects.Its practical applications are limited by low electronic/ionic conductivity and structural instability caused by the Jahn-Teller effect of Mn^(3+).Recent progress in ion doping modification of LMFP materials is summarized.Starting with crystal structure analysis,the fundamental causes of LMFP’s performance limitations are analyzed.Then the research strategies and mechanisms for Li-site,Mn/Fe-site,PO_(4)-site and multi-site doping are summarized.Emphasis is placed on how different doping strategies enhance LMFP’s rate capability and cycling stability through crystal structure regulation,electron/ion transport pathway optimization and Jahn-Teller effect suppression.Finally,existing challenges and future development directions in LMFP doping modification are discussed.

关 键 词：锂离子电池 正极材料 磷酸锰铁锂 离子掺杂 改性 

分 类 号：TM912.9[电气工程—电力电子与电力传动]