摘要
为改善锂离子电池的循环以及倍率快充性能需要对LiMn_(0.6)Fe_(0.4)PO_(4)进行改性,通过包覆羟基氧化钴,烧结后表面形成具有三价Co的钴化合物包覆物,高价态的Co化合物具有较高的锂离子扩散系数和电子电导率,可以显著提高LiMn_(0.6)Fe_(0.4)PO_4界面处锂离子扩散速率和电化学反应速率,改善LiMn_(0.6)Fe_(0.4)PO_(4)的循环和低温性能。
In order to improve the cycling and rate fast charging performance of Lithium-ion batteries,LiMn_(0.6)Fe_(0.4)PO_(4) needs to be modified.In this paper,hydroxylated cobalt oxide is coated and sintered to form a cobalt compound coating with trivalent Co on the surface.The high valence Co compound has a high lithium-ion diffusion coefficient and electronic conductivity,which can significantly improve the lithium-ion diffusion rate and electro-chemical reaction rate at the LiMn_(0.6)Fe_(0.4)PO_(4) interface,and improve the cycling and low-temperature performance of LiMn_(0.6)Fe_(0.4)PO_(4).
作者
张绮兰
仇未星
王波
韩玮
柴同
张胜男
ZHANG Qilan;QIU Weixing;WANG Bo;HAN Wei;CHAI Tong;ZHANG Shengnan(School of Mechanical Engineering,Lanzhou Petrochemical University of Vocational Technology,Lanzhou 730000,China)
出处
《兰州工业学院学报》
2024年第5期91-95,共5页
Journal of Lanzhou Institute of Technology
基金
兰州石化职业技术大学科研究项目(2023KY-08)。
关键词
锂离子电池
磷酸锰铁锂材料
包覆改性
性能优化
lithium-ion battery
lithium manganese iron phosphate material
coating modification
performance optimization
