摘要
LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2电池工作电压提高可以显著的提高电池容量密度,但是随之而来的是高电位下正极与电解液副反应加剧,影响电池使用寿命。本文通过使用F-EPE、LiTFSI作为锂离子电解液添加剂,能够有效的提高LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2电池在4.5V电压下的使用寿命。通过线性扫描伏安法(LSV)、充放电循环曲线和阻抗测试等手段说明添加剂在正负极参与成膜,降低了循环过程中阻抗变化,从而提高电池在4.5V下的循环寿命。
The capacity density can be increased by increasing the working voltage of LiNi0.5Co0.2Mn0.3O2 battery,but the side reaction between positive electrode and electrolyte was aggravated at high potential,which affect the cycle life of the battery.In this paper,the cycle performance can be effectively improved by using the electrolyte with 3-(1,1,2,2-Tetrauoroethoxy)-1,1,2,2-tetrauoropropane(F-EPE)and lithium bis(fluorosulfonyl)imide(LiTFSI).Linear sweep voltammetry(LSV),charge-discharge cycle testing and impedance measurements show that additives are involved in film formation on positive and negative electrodes,which reduces the increasing of impedance during the cycle and improves the cycle life of battery at 4.5 V.
作者
黄文达
王成运
陈占军
HUANGWen-da;WANG Cheng-yun;CHEN Zhan-jun(Guangdong Jinguang Hi-Tech Co.,Ltd,Guangzhou,Guangdong 440113,China;School of Materials Science and Engineering,Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials,South China University of Technology,Guangzhou,Guangdong 510641,China;Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials,School of Material and Environmental Engineering,Hunan Institute of Humanities,Science and Technology,Loudi,Hunan 47000,China)
出处
《电池工业》
CAS
2018年第6期291-294,共4页
Chinese Battery Industry
基金
湖南省科技计划项目(2016TP1028)
