电解质
锂(药物)
X射线光电子能谱
电导率
扫描电子显微镜
化学
磷酸盐
化学工程
石墨
电化学
无机化学
材料科学
电极
有机化学
物理化学
复合材料
内分泌学
工程类
医学
作者
Yixuan Gu,Shaohua Fang,Li Yang,Shin‐ichi Hirano
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-05-03
卷期号:4 (5): 4919-4927
被引量:12
标识
DOI:10.1021/acsaem.1c00503
摘要
Tris(2,2,2-trifluoroethyl) phosphate, as a flame-retarding cosolvent, is initially mixed with γ-butyrolactone for the first time to formulate a nonflammable electrolyte, in which lithium difluoro(oxalato)borate is added as a film-forming additive. This electrolyte possesses a higher safety level and better wettability compared with a commercial electrolyte. The conductivity of this electrolyte is 7.40 mS cm–1 at room temperature. This high-safety electrolyte helps graphite/LiNi0.5Co0.2Mn0.3O2 full cells to obtain good electrochemical performance. The capacity retention after 200 cycles at room temperature (1C) is 90.8% and the capacity retention of 100 cycles at 60 °C (1C) is up to 86.7%, which are better than those of the commercial electrolyte. To further analyze the relationships between compositions of electrolytes and the electrochemical performance of the full cells, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) measurements are performed.
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