Electrochemical characteristics of electrospun poly(methyl methacrylate)/polyvinyl chloride as gel polymer electrolytes for lithium ion battery

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• 作者：Hong-Ryun Jung^a ; Wan-Jin Lee^a ; ^b ; ^{wjlee@jnu.ac.kr}
• 关键词：Gel polymer electrolyte ; Electrospinning ; Poly(methyl methacrylate) ; Polyvinyl chloride ; Lithium battery
• 刊名：Electrochimica Acta
• 出版年：2011
• 出版时间：30 December, 2011
• 年：2011
• 卷：58
• 期：Complete
• 页码：674-680
• 全文大小：1006 K

文摘

Various electrospun poly(methyl methacrylate)/polyvinyl chloride (PMMA/PVC) blend nonwoven membranes were prepared by electrospinning of the blend solutions containing PMMA and PVC in N,N-dimethylformamide (DMF). The electrospun PMMA/PVC had fully interconnected pore structure with high porosity and large specific surface area capable of high uptake of organic liquid electrolyte as gel polymer electrolytes (GPEs). The electrospun PMMA/PVC-based GPEs showed superior electrochemical properties than PVC-based GPE. Among PMMA/PVC-based GPEs, the 10PMMA/PVC-based GPE comprising 10 wt. % PMMA and 90 wt. % PVC represents the highest ionic conductivity as 7.8 ¡Á 10^? S cm^? and the lowest interfacial resistance as 31.49 ¦¸ with sufficient electrochemical stability of up to 4.7 V. The LiCoO₂/GPE/graphite cell using 10PMMA/PVC-based GPE retained the discharge capacity of 140 mAh g^? after 100 cycles at 0.5 C without reducing discharge capacity, while PVC-based GPE showed continuous fading by 110 mAh g^?. Also, the cell using 10PMMA/PVC-based GPE showed the excellent electrochemical performance caused by the formation of interconnected porous structure and gel state in fibers even at high C-rate (1, 2, 5 C).