Journal
JOURNAL OF POWER SOURCES
Volume 451, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.227759
Keywords
Li-ion battery; Separator; PVDF/SiO2 membrane; High-electrochemical performance
Funding
- National Natural Science Foundation of China [21371023, 11904153]
- Beijing Institute of Technology Research Fund Program for Young Scholars [3090012221914]
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LIBs with improved specific capacity even more than theoretical capacity that is provided by poly (vinylidene fluoride) and silicon dioxide (PVDF/SiO2) nanofiber composite membrane separator is presented in our study. The experiment results are in agreement with simulation analysis that Si can substitute P in the LiFePO4 during the charge-discharge process and lead a great electrochemical performance. It provides a new approach to significantly improve the overall electrochemical performance. This can be described as the capacity of 175 mAh/g at 0.1 C; 160.7 inAh/g at 0.5 C and subsequent residual capacity is 168.6 mAh/g at 0.2 C after long-term cycles of 300 times and the coulombic efficiency is 98.22%. Meanwhile, the PVDF/SiO2 separators are exhibited higher porosity (131.33%) and electrolyte uptake (1514.79%) than commercial PP separator, and also evaluated reduced interfacial resistance and higher thermal property that the initial decomposition temperature is 389.05 C. The PVDF/SiO2 separators with better performance than commercial separator apply to conventional lithium-ion batteries leads to improved electrochemical performance obviously, and can be more prospective for LIBs after multiple modified preparations.
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