Synthesis of PVDF-HFP based gel polymer electrolyte and study of lithium ion battery performance

doi:10.19799/j.cnki.2095-4239.2021.0166

Abstract

Abstract:

Gel polymer electrolyte based on polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) is regarded as a promising solid electrolyte for addressing the problem of lithium power safety. However, because they contain a lot of flammable substances, gel solid polymer electrolytes are still not guaranteed at the moment. Therefore, a new type of gel polymer electrolyte based on PVDF-HFP was synthesized. Using succinonitrile (SN) as a plasticizer and lithium bis(trifluoromethanesulphonyl)imide (LiTFSI) as the lithium salt, a new gel solid polymer electrolyte (GSPE) with high thermal stability was prepared in situ by the thermal cross-linking method. At 25 ℃, the optimized gel polymer electrolyte's ionic conductivity can reach 3.7×10^-3 S/cm, and the electrochemical window can reach 4.5 V. In addition, the gel polymer electrolyte has good electrode interface compatibility. The assembled lithium iron phosphate battery is circulated 80 times at 1 C, with an 89% capacity retention rate. This study shows that high-performance gel polymer electrolytes have great potential applications in improving the cycle stability and safety of lithium-ion batteries.

Key words: lithium-ion battery, gel solid polymer electrolyte, PVDF-HFP, plasticizer

CLC Number:

Ruliang LIU, Xingyuan GAO, Wei YIN, Naitao YANG. Synthesis of PVDF-HFP based gel polymer electrolyte and study of lithium ion battery performance[J]. Energy Storage Science and Technology, 2021, 10(6): 2077-2081.

Figures/Tables 4

References 14

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