期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 871, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114308
关键词
Gel polymer electrolytes; PVdF-HFP; UV-curing; Lithium dendrites
资金
- Natural Science Foundation of Beijing [L182062]
- talents project of Beijing Municipal Committee Organization Department [2018000021223ZK21]
- Yue Qi Young Scholar Project of China University of Mining & Technology (Beijing) [2017QN17]
- Fundamental Research Funds for the Central Universities [2014QJ02]
The gel polymer electrolytes have attracted great attention due to their potential in uniform deposition of lithium, formation of stable SEI, nontoxicity, non-flammability and no leakage. In this work, the PVdF-HFP based gel polymer electrolytes are synthesized by UV-curing method, and the PEGMA and PEGDA are employed to enhance the mechanical properties of the electrolyte by forming 3D semi-interpenetrating polymer network. The PVdF-based gel polymer electrolyte with high ionic conductivity of 4.13 x 10(-3) s/cm at room temperature shows superior cycling (140mAh g(-1) at 0.5C after 200 cycles) and rate performance (142 mAh g(-1) at 0.1C, 123 mAh g(-1) at 1C and 90 mAh g(-1) at 2C) when LiFePO4 is used as cathode materials. Moreover, the PVdF-based gel polymer electrolyte displays promising performance under high voltage when the NCM523 is selected as cathode materials (136mAh g(-1) at 0.5C after 50 cycles). The excellent electrochemical performance as well as high ionic conductivity of the electrolyte may be ascribed to the remarkable liquid absorbing ratio of PVdF-HFP and the 3D cross-linking structure with semi-interpenetrating polymer network formed during UV-curing process.
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