期刊
ELECTROCHIMICA ACTA
卷 302, 期 -, 页码 286-290出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.02.052
关键词
Polymer electrolyte; Poly(ethylene carbonate); End-capping; Li battery; Cyclability
资金
- JSPS KAKENHI [16H04199]
- Grants-in-Aid for Scientific Research [16H04199] Funding Source: KAKEN
We study the ion-conductive and electrochemical properties of concentrated poly (ethylene carbonate) (PEC)-based electrolytes with Li salt concentrations greater than 100 mol%. An end-capped PEC having acetate groups (PEC-Ac) was synthesized as a novel polymer matrix for improving the thermal stability and oxidative stability. A concentrated PEC-Ac electrolyte with 120 mol% of LiFSI had a good conductivity of approximately 10(-6) S/cm at 40 degrees C with an excellent Li transference number (t(+)) of 0.8. Linear sweep voltammetry measurement for the PEC-Ac electrolyte indicates that the oxidation tolerance is more than 5 V, and is greater than that of the original PEC-based electrolyte. A battery test for the LiFePO4 cell using the PEC-Ac electrolyte was conducted for the first time, finding good capacities ranging from 130 to 160 mAh/g and stable cyclability for more than 60 cycles. (C) 2019 Elsevier Ltd. All rights reserved.
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