表面改性对锰酸锂电池电化学性能的影响  

The Influence of Surface Modification on the Electrochemical Performance of Lithium Manganese Oxide Batteries

作　　者：黄琳凯 黄炳行 李春霞 张丽云 黄炳龙 陈艳 詹锋[3] HUANG Linkai;HUANG Bingxing;LI Chunxia;ZHANG Liyun;HUANG Binglong;CHEN Yan;ZHAN Feng(Guangxi Metallurgical Research Institute Co.,Ltd.,Nanning,Guangxi 530013,China;Southern Manganese Industry Group Co.,Ltd.,Nanning,Guangxi 530201,China;Guangxi University,Nanning,Guangxi 530004,China)

机构地区：[1]广西冶金研究院有限公司,广西南宁530013 [2]南方锰业集团有限责任公司,广西南宁530201 [3]广西大学,广西南宁530004

出　　处：《中国锰业》2024年第4期36-37,41,共3页China Manganese Industry

基　　金：国家自然科学基金(编号:11364003);广西创新驱动重大专项桂科(编号:AA19182014)。

摘　　要：尖晶石型LiMn_(2)O_(4)在循环过程中存在容量衰减较快和放电容量较低的问题,这主要是由Jahn-Teller效应、Mn溶解等原因引起的。研究通过对尖晶石型LiMn_(2)O_(4)进行碳包覆,来提高其结构稳定性和电化学性能。电化学测试结果表明:碳包覆后的LiMn_(2)O_(4)首圈放电比容量显著提高,且在1 C电流倍率下经过100次充放电循环后容量保持率也有所提升。SEM图像分析显示:碳包覆后的样品表面形成了均匀致密的包覆层,有助于提高材料的结构稳定性。结论指出,碳包覆技术可以减小锂离子脱嵌的阻力,抑制Mn的溶解,从而提高LiMn_(2)O_(4)的结构稳定性和电化学性能,对锂离子电池的改性处理具有重要的应用前景。Spinel-type LiMn_(2)O_(4)has the problems of rapid capacity decay and low discharge capacity during cycling,mainly caused by the Jahn-Teller effect,Mn dissolution,and other reasons.The study aims to improve the structural stability and electrochemical performance of spinel-type LiMn_(2)O_(4)by carbon coating.The electrochemical test results showed that the discharge specific capacity of LiMn_(2)O_(4)after carbon coating was significantly increased in the first cycle,and the capacity retention rate was also improved after 100 charge-discharge cycles at a current rate of 1 C.SEM image analysis showed that a uniform and dense coating layer was formed on the surface of the carbon-coated sample,which helped to improve the structural stability of the material.The conclusion points out that carbon coating technology can reduce the resistance of lithium-ion deintercalation,inhibit the dissolution of Mn,thereby improving the structural stability and electrochemical performance of LiMn_(2)O_(4),and has important application prospects for the modification of lithium-ion batteries.

关 键 词：尖晶石型 LiMn_(2)O_(4) 表面改性 碳包覆 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]