电解质
石墨
碳酸乙烯酯
库仑法
材料科学
等温过程
锂(药物)
电镀(地质)
Crystal(编程语言)
单晶
化学工程
电化学
无机化学
电极
化学
冶金
结晶学
热力学
程序设计语言
工程类
物理化学
内分泌学
地质学
物理
医学
计算机科学
地球物理学
作者
Jing Li,Hongyang Li,W J D Stone,Stephen Glazier,J. R. Dahn
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2018-01-01
卷期号:165 (3): A626-A635
被引量:66
摘要
NMC532/artificial graphite cells using single crystal NMC532 active material can have excellent long term lifetime at 4.4 V and elevated temperature if appropriate electrolytes are used. However, electrolytes developed earlier for these cells and reported in the literature cannot support even C/2 rates during charging without unwanted lithium plating at room temperature. This work is thus focused on the development of new electrolytes for single crystal NMC532/artificial graphite cells that can yield long lifetime and support higher charging rates. Ex-situ and in-situ gas measurements, ultra-high precision coulometry, isothermal microcalorimetry, lithium plating tests and long term cycling tests were used for the screening of electrolytes. Electrolytes with 2% vinylene carbonate (VC) + 1% ethylene sulfate (DTD) additives or 2% fluoroethylene carbonate (FEC) + 1% DTD additives yield single-crystal NMC532/graphite cells with long lifetime that can support C-rate charging at 20°C.
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