双重改性三元正极材料及其性能研究
Study on properties of dually modified ternary cathode materials
郭金梅 1朱华丽 2沈瑞 1朱敏丹 1卢朝操 1陈召勇3
作者信息
- 1. 长沙理工大学物理与电子科学学院,湖南 长沙 410114
- 2. 长沙理工大学物理与电子科学学院,湖南 长沙 410114;长沙理工大学能源与动力工程学院,湖南 长沙 410114
- 3. 长沙理工大学新能源动力电池研究所,湖南 长沙 410114
- 折叠
摘要
为提高三元正极材料LiNi0.5Co0.2Mn0.3O2(NCM523)的可逆比容量和循环稳定性,通过表面包覆聚并苯(PAS)复合钾氯共掺杂对NCM523 材料进行双重改性,利用XRD、SEM、TEM等分析方法和恒电流充放电性能测试,研究了不同PAS包覆量复合K、Cl共掺杂NCM523 材料的结构、形貌和电化学性能.结果表明,2％PAS包覆复合1％K和Cl共掺的NCM523 材料在0.1C首次放电容量为 209.5 mAh/g;1 C倍率下充放电循环 100 次后放电容量保持率比未改性的NCM523 提高了 19％;5 C倍率下的放电比容量为 158.1 mAh/g,比未改性的NCM523 提高了13％.
Abstract
In order to improve the reversible specific capacity and the cycling stability of LiNi0.5Co0.2 Mn0.3O2(NCM523),it is dually modified through coated with polyacene(PAS)and co-doped with potassium and chloride.The structure,morphology,and electrochemical properties of NCM523,which are coated with different amounts of PAS and doped with potassium and chloride,are studied by means of XRD,SEM,TEM,and the constant current charge-discharge test.The results show that the NCM523 sample co-doped with 1 mol％K and Cl and coated with 2 wt.％PAS demonstrates the initial discharge capacity of 209.5 mAh·g-1 at 0.1 C.After both have experienced for 100 cycles of charge-discharge at 1C,the discharge capacity retention rate of the dually modified sample is 19％higher than that of the unmodified NCM523.The specific discharge capacity of the dually modified NCM523 sample is 158.1 mAh·g-1 under the 5 C ratio,which is 13％higher than that of the unmodified NCM523.
关键词
锂离子电池/正极材料/镍钴锰酸锂/表面包覆/掺杂Key words
lithium-ion battery/cathode material/lithium nickel-cobalt-manganese oxide/surface coating/doping引用本文复制引用
基金项目
国家自然科学基金(51604042)
国家自然科学基金(51874048)
长沙市科技重大专项(kh2003021)
出版年
2024
NETL
NSTL
万方数据