富锂锰基材料低首次库仑效率原因及改性策略
Reasons and modification strategies of low initial coulombic efficiency of lithium-rich manganese-based cathode materials
张佳文 1蔡星鹏 1周俊飞 1丁浩 1张宁霜 2崔孝玲2
作者信息
- 1. 兰州理工大学 石油化工学院,甘肃 兰州 730050
- 2. 兰州理工大学 石油化工学院,甘肃 兰州 730050;甘肃省低碳能源化工重点实验室,甘肃 兰州 730050
- 折叠
摘要
富锂锰基正极材料[xLi2MnO3·(1-x)LiTMO2,0<x<1,TM=Mn、Co、Ni等](LROs)具有高容量、高工作电压、高安全、低成本等诸多优点,是下一代新型锂离子电池材料中最具有应用前景的正极材料之一.然而,LROs的低首次库仑效率严重地阻碍了其商业化,亟需深入研究其低首次库仑效率原因.从LROs的晶体结构及充放电行为出发,全面剖析了氧的不可逆流失、Li+不可逆脱/嵌、Li+与H+离子交换等造成LROs低首次库仑效率原因的具体机理;针对性地总结了离子掺杂、表面工程、单晶化等提升首次库仑效率的相关改性策略;展望了提升LROs未来商业化的研究方向.
Abstract
The many advantages of lithium-rich manganese-based cathode materials[xLi2MnO3·(1-x)LiTMO2,0<x<1,TM=Mn,Co,Ni,etc.](LROs),such as high capacity,high working voltage,high safety and low cost,makes them one of the most promising cathode materials in next generation of new lithium ion battery materials.However,the low initial coulombic efficiency of LROs is a serious impediment to their commercialisation and the reasons for this low initial coulombic efficiency need to be investigated in depth.Based on the analysis results from the crystal structure and charging/discharging behavior of LROs,the specific mechanisms for the low first coulombic efficiency of LROs caused by the irreversible loss of oxygen,irreversible delithiation/lithiation,exchange of Li+and H+ions and so on were discussed comprehensively.The relevant modification strategies for improving low initial coulombic efficiency such as ion doping,surface engineering and single crystallization were then summarized.Finally,the research direction for improving the future commercialization of LROs was pointed out.
关键词
锂离子电池/富锂锰基正极材料/首次库仑效率/改性策略Key words
lithium ion batteries/lithium-rich manganese-based cathode materials/initial coulombic efficiency/modification strategy引用本文复制引用
基金项目
甘肃省重点研发计划(21YF5GA079)
甘肃省教育厅优秀研究生"创新之星"项目(2022CXZX-426)
出版年
2024
NETL
NSTL
万方数据