O2型富锂锰基正极材料研究进展  

Research progress of O2-type lithium-rich manganese-based cathode materials

作　　者：汪玉洁 王振伟 耿德超 陈亚楠 Yujie Wang;Zhenwei Wang;Dechao Geng;Yanan Chen(YinYi Group Co.Ltd.,Ningbo 315020,China;College of Resource and Environment,Baoshan University,Baoshan 678000,China;School of Science,Tianjin University,Tianjin 300072,China;School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]银亿集团有限公司,宁波315020 [2]保山学院资源环境学院,保山678000 [3]天津大学理学院,天津300072 [4]天津大学材料科学与工程学院,天津300072

出　　处：《中国科学：化学》2024年第12期2377-2386,共10页SCIENTIA SINICA Chimica

基　　金：国家重大基础研究项目(编号:52171219);国家自然科学基金(编号:92372107)资助项目。

摘　　要：富锂锰基正极材料阴阳离子氧化还原机制能够提供超过250 m Ah g^(-1)的高比容量,使其在高能量密度锂离子电池领域展现出巨大的应用前景.不同于传统O3型富锂锰基正极材料,具有独特氧排列构型的O2型富锂锰基正极材料显示出相对更高的阴离子氧化还原反应可逆性和结构稳定性.受限于材料表面发生的不可逆氧损失、电解液氧化和循环过程中结构完整性对首次库仑效率、倍率性能和循环稳定性等的影响,O2型富锂锰基正极材料的商业化应用进程缓慢.本文主要总结了近年来O2型富锂锰基正极材料的制备方法、晶体结构和储锂机理认识,以及结构调控、抑制电解液氧化和缓解应变效应等改性策略对提升材料容量和循环稳定性的作用机制和功效,并对该材料未来的研究方向进行展望,推进O2型富锂锰基正极材料产业化开发应用.The anionic-cationic redox mechanism of Li-rich manganese-based cathode materials is capable of providing a high specific capacity of more than 250 mAh g^(-1),which thus indicates the great application prospects in the field of high-energy-density lithium-ion batteries.Discriminate from traditional O3-type Li-rich Mn-based cathode materials,the unique oxygen-arranged configurations of O2-type Li-rich Mn-based cathode materials exhibit the relatively higher redox reversibility and structural stability.Limits of the influence of irreversible oxygen loss occurring on the material surface,electrolyte oxidation and structural integrity during the cycling process on the initial coulombic efficiency,rate performance and cycling stability,the commercial applications of O2-type Li-rich Mn-based cathode materials have been slacken.This paper mainly summarizes the preparation method,understanding of crystal structure and lithium storage mechanism towards O2-type Li-rich Mn-based cathode materials in recent years,as well as the mechanism and efficacy of modification strategies including structure modulation,inhibition of electrolyte oxidation and mitigation of strain effects upon enhancing the capacity and cycle stability of the materials.In addition,the future research direction of O2-type Li-rich Mn-based cathode materials is prospected to promote the industrial development and application.

关 键 词：O2型富锂锰基材料 氧化还原可逆性 结构稳定性 正极改性 锂离子电池 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]