Gel polymer electrolyte based on PVDF-HFP matrix composited with rGO-PEG-NH2 for high-performance lithium ion battery

被引:105
作者
Xu, Pei [1 ]
Chen, Hanyang [1 ]
Zhou, Xin [2 ]
Xiang, Hongfa [2 ]
机构
[1] Hefei Univ Technol, Sch Chem & Chem Engn, Anhui Key Lab Adv Funct Mat & Devices, Hefei 230009, Peoples R China
[2] Hefei Univ Technol, Sch Mat Sci & Engn, Anhui Key Lab Adv Funct Mat & Devices, Hefei 230009, Peoples R China
基金
中国国家自然科学基金;
关键词
Gel polymer electrolyte; Ionic liquid; Lithium ion batteries; Ionic conductivity; Lithium ion transport network; GRAPHENE OXIDE; SOLID POLYMER; LIQUID; MEMBRANE; SEPARATOR; TRANSPORT; COPOLYMER;
D O I
10.1016/j.memsci.2020.118660
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A series of composite gel polymer electrolytes (GPEs) based on poly (vinylidene fluoride-co-hexafluompropylene) (PVDF-HFP), 1-ethtyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([EMIM][TFSI]), lithium bis (trifluoromethane) sulfonimide (LiTFSI) and covalent linked 2,2 ''-(ethylenedioxy) bis (ethylamine) to reduced graphene oxide (rGO-PEG-NH2) have been successfully prepared by solution casting method. With the increase of [EMIM] [TFSI] and rGO-PEG-NH2 content, the crystallinity of the GPE decreased, and the thermal decomposition temperature increased significantly. A high-speed lithium ion transport network was formed in the 3P5E2LG-10 GPE, with rGO as the connection site and PEG as the bridge. 3P5E2LG-10 GPE exhibited a conductivity of 2.1 x 10(-3) S cm(-1) at 30 degrees C, a lithium ion transference number of 0.45, and a electrochemical window of 5.0 V. The 3P5E2LG-10 based cell exhibited more than 99% columbic efficiency and the initial discharge capacity reached the maximum of 163.7 mAh/g, and capacity retention was about 88% after 80 cycles at 0.1C. 3P5E2LG-10 GPE will have great potential for lithium ion battery with high safety and long cycle life.
引用
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页数:8
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