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	High-performance lithium-ion batteries with gel polymer electrolyte based on ultra-thin PVDF film
	Shi, Tianze1,2; Kang, Shuai1,2; Zhang, Kun1,3; Xue, Fengjuan1,4; Lu, Wenqiang1,2
	2022-05-06
摘要	Both reducing the liquid electrolyte and solid electrolyte have been acting as novelty strategy for commercial lithium-ion batteries avoiding safety problems such as fires and explosion which is mostly caused by the liquid organic electrolyte flammability. However, reducing the liquid electrolyte leads to capacity loss and energy fade of batteries. Here, we synthesized ultra-thin film of polyvinylidene fluoride (PVDF)-based gel polymer electrolyte (GPE), which also act as the separator, with trace amount electrolyte solution as a whole system to explore the optimized balance between safety and capacity of these new batteries. Both battery rate performance and cyclic stability are significantly improved when the thickness of the polymer electrolytes decrease to 20 mu m. Furthermore, the batteries exhibit excellent cyclic stability when a minimum of 5 mu l liquid electrolytes was added to the surface of the thin PVDF film (110.9 mAh center dot g(-1) with a capacity retention of 78.6% at 0.5C after 150 cycles). It should be noted that the maximum discharge-specific capacity and discharge-specific capacity after 150 cycles of 5 mu l-LFP/GPE-20/GC cell is 1.29 and 1.44 times larger than that of commercial cells. All the experiment results above might provide an optimization technical route and process for real applications in future lithium-ion batteries.
关键词	Gel polymer electrolytes PVDF Lithium-ion batteries Thickness
DOI	10.1007/s11581-022-04588-2
发表期刊	IONICS
ISSN	0947-7047
页码	8
通讯作者	Lu, Wenqiang(wqlu@cigit.ac.cn)
收录类别	SCI
WOS记录号	WOS:000791651200001
语种	英语