锰基钠离子电池正极材料Jahn-Teller效应抑制方法进展  

Progress of the Jahn-Teller effect suppression method for manganese-based sodium-ion battery cathode materials

作　　者：王绍聪 李伟[1] 黄瑞琴 郭艺飞 刘峥[1] WANG Shaocong;LI Wei;HUANG Ruiqin;GUO Yifei;LIU Zheng(School of Chemical and Biological Engineering,Guilin University of Technology,Guangxi Key Laboratory of Electromagnetic Chemical Functional Substances,Guilin 541004,Guangxi,China)

机构地区：[1]桂林理工大学化学与生物工程学院,电磁化学功能物质广西区重点实验室,广西桂林541004

出　　处：《储能科学与技术》2023年第1期139-149,共11页Energy Storage Science and Technology

基　　金：国家自然科学基金项目(52004076);广西自然科学基金项目(2020GXNSFAA297054);桂林理工大学博士启动基金项目(GUTQDJJ6613012)。

摘　　要：本文对近些年国内外锰基钠离子电池正极材料Jahn-Teller效应抑制方法的研究成果进行了综述。目前抑制锰基电极材料Jahn-Teller效应方法主要有掺杂、包覆等。首先介绍钠离子电池正极材料中锰基层状过渡金属氧化物和Na_(2)MnPO_(4)F聚阴离子型化合物晶体结构和电化学性能;重点介绍了掺杂和包覆两种抑制手段及抑制效果,研究表明掺杂可以调控锰离子价态,稳定其结构不发生畸变,因而掺杂在抑制Jahn-Teller效应方面优于包覆。掺杂的研究热点主要涉及金属阳离子掺杂、非金属阴离子掺杂、氧空位生成,而能有效将电极材料与电解液隔离的包覆也在一定程度上抑制Jahn-Teller效应。最后总结指出抑制Jahn-Teller效应最有效的方法还是从材料结构入手,通过控制Mn—O键长来保证材料结构不会发生扭曲,同时Mn^(3+)浓度也会相应降低。本文对于Jahn-Teller效应抑制方法的系统总结有望为日后提出新的抑制Jahn-Teller效应的方案提供理论基础。In this study,the research results in recent years of the Jahn-Teller effect suppression methods for manganese-based sodium-ion battery cathode materials at home and abroad were reviewed.Doping and coating are the main methods to suppress the Jahn-Teller effect in manganese-based electrode materials.This study first introduces the crystal structures and electrochemical properties of manganese base-transition metal oxides and Na_(2)MnPO_(4)F polyanionic compounds in sodium-ion battery cathode materials.Then,it focuses on two inhibition methods,doping and cladding,and their inhibition effects.Doping is,therefore,better than coating in suppressing the Jahn-Teller effect.The hot spots of doping research are mainly related to metal cation doping,nonmetal anion doping,oxygen vacancy generation,and coating,which can effectively isolate the electrode material from the electrolyte and suppress the JahnTeller effect to a certain extent.Finally,it is concluded that the most effective way to suppress the Jahn-Teller effect is to start from the material’s structure by controlling the Mn—O bond length to ensure that the material structure is not distorted and the Mn^(3+)concentration is reduced accordingly.This study’s systematic review of Jahn-Teller effect suppression methods is expected to provide a theoretical basis for future suggestions of novel Jahn-Teller effect suppression techniques.

关 键 词：钠离子电池 聚阴离子化合物 正极材料 JAHN-TELLER效应 锰离子 

分 类 号：TQ127.11[化学工程—无机化工]