Application of poly(vinylidene fluoride-co-hexafluoropropylene) blended poly(methyl vinyl ether-alt-maleic anhydride) based gel polymer electrolyte by electrospinning in Li-ion batteries

Autor: Jiaxin Xu, Weishan Li, Fangbin Chen, Jinhong Huang, Youhao Liao, Liu Qiuyu, Minsui Li
Rok vydání: 2018
Předmět:
Zdroj: Solid State Ionics. 325:57-66
ISSN: 0167-2738
DOI: 10.1016/j.ssi.2018.07.028
Popis: To compensate the disadvantage of traditional poly(vinylidene fluoride-co-hexafluoropropylene) (P(VdF-HFP)) based gel polymer electrolyte (GPE) with poor rate performance, new GPE system consisted of P(VdF-HFP) and poly(methyl vinyl ether-alt-maleic anhydride) (P(MVE-MA)) with different ratios were prepared by electrospinning technology using polyethylene (PE) as support. After introducing P(MVE-MA) into P(VdF-HFP) system, the performance of the blended membrane and the GPE was significantly improved. Especially M4 based GPE blended with the mass ratios of P(MVE-MA): P(VdF-HFP) = 75: 25 exhibited the best physical and electrochemical characterizations. The developed membranes with interconnected fibrous structure showed the average diameter of 0.1–2.0 μm, which were facilitated for uptaking the liquid electrolyte and improving the ionic conductivity for corresponding GPEs. The introduced P(MVE-MA) copolymer presented higher decomposition voltage than P(VdF-HFP) copolymer from the calculation result of oxidation potential, leading to higher oxidative stability for blended GPE than pure P(VdF-HFP) based GPE. Furthermore, M4 based GPE presented remarkable interfacial compatibility with electrode and the lower polarization resistance, resulting in better cycling stability and rate performance, which had 96.5% capacity retention after 100 cycles and the discharge capacity at 5C kept 91.6% of 1C capacity in Li/GPE/LiNi0.5Mn1.5O4 coin cell, compared with P(VdF-HFP) based GPE that had 87.8% retained capacity after 100 cycles and 48.7% retention capacity at 5C.
Databáze: OpenAIRE
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