电解质
阴极
材料科学
多收费
锂(药物)
离子
电池(电)
电化学
荷电状态
离子电导率
电压
电气工程
化学
电极
热力学
工程类
物理
功率(物理)
有机化学
物理化学
医学
内分泌学
作者
Michael Baird,Junhua Song,Ran Tao,Youngmin Ko,Brett A. Helms
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2022-10-11
卷期号:7 (11): 3826-3834
被引量:7
标识
DOI:10.1021/acsenergylett.2c02111
摘要
Electric vehicles capable of recharging in the same time it takes to refuel a gasoline-powered car require electrolytes that maximize areal ion flux to enable electrochemical reactions to proceed at the same rate that current is passed through the external circuit. While strategies for increasing ionic charge carrier concentration in electrolytes are well-established, enhancements are made at the expense of carrier mobility, placing a ceiling on areal ion flux below the requirement for fast-charge. Here, we explore locally superconcentrated electrolytes, which employ a noncoordinating diluent to reduce viscosity, for delivering an 80% change in state-of-charge in Li|NMC622 batteries in 5–15 min. We investigate the effects of concentration, viscosity, ionic conductivity, and solvation on lowering fast-charge overpotentials and extending cycle life. We identify divergent failure mechanisms that occur on different time scales when cycling the cells at different charge rates and depths of discharge, which has implications for future electrolyte designs.
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