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
黄琳凯 1黄炳行 2李春霞 2张丽云 2黄炳龙 2陈艳 2詹锋3
作者信息
- 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
- 折叠
摘要
尖晶石型LiMn2O4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LiMn2O4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LiMn2O4首圈放电比容量显著提高,且在1C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LiMn2O4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.
Abstract
Spinel-type LiMn2O4 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 LiMn2O4 by carbon coating.The electrochemical test results showed that the discharge specific capacity of LiMn2O4 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 LiMn2O4,and has important application prospects for the modification of lithium-ion batteries.
关键词
尖晶石型/LiMn2O4/表面改性/碳包覆/电化学性能Key words
Spinel-type/LiMn2O4/Surface modification/Carbon coating/Electrochemical performance引用本文复制引用
基金项目
国家自然科学基金(11364003)
广西创新驱动重大专项桂科(AA19182014)
出版年
2024
NETL
NSTL
万方数据