期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 27, 期 2, 页码 455-465出版社
SPRINGER
DOI: 10.1007/s10008-022-05339-z
关键词
Gel polymer electrolyte; Lithium ion battery; Poly(vinylidene fluoride-co-hexafluoropropylene)
The composite membrane PDFP-POPM, prepared by blending PDFP and POPM, exhibited a porous structure and high ionic conductivity. The lithium ion transference number of the gel polymer electrolyte (GPE) based on PDFP-POPM was higher than that of other GPEs. The battery using PDFP-POPM as electrolyte showed good electrochemical stability and cycling performance.
The composite membrane (PDFP-POPM) based on the blending of poly(vinylidene fluoride-co-hexafluoropropylene) (PDFP) and POPM (the copolymer of organic palygorskite and methyl methacrylate) was prepared by the phase-inversion method, and a gel polymer electrolyte (GPE) was obtained when the PDFP-POPM was activated by absorbing liquid electrolyte (LE). The SEM morphologies showed that the PDFP-POPM had a porous structure. The XRD results indicated that PDFP-POPM was an amorphous polymer and that the POPM could effectively suppress the crystallization of PDFP. The lithium ion transference number of GPE was higher than that of pristine POPM- and PDFP-based GPE. When the mass concentration of PDFP was 40%, the uptake of the PDFP-POPM and ionic conductivity of GPE reached the maximum values of 164% and 2.37 mS/cm, respectively. The electrochemical stability window of Li/GPE/SS batteries was over 4.7 V (vs. Li+/Li), and the Li/40PDFP-POPM GPE/LiFePO4 battery exhibited good cycling performance. The discharge capacity of the battery was 145mAh g(-1) after 100 cycles and the columbic efficiency was over 95%.
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