Design of Poly(Acrylonitrile)-Based Gel Electrolytes for High-Performance Lithium Ion Batteries

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• 作者：Shih-Hong Wang ; Ping-Lin Kuo ; Chien-Te Hsieh ; Hsisheng Teng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：6
• 期：21
• 页码：19360-19370
• 全文大小：603K
• ISSN：1944-8252

文摘

The use of polyacrylonitrile (PAN) as a host for gel polymer electrolytes (GPEs) commonly produces a strong dipole鈥揹ipole interaction with the polymer. This study presents a strategy for the application of PAN in GPEs for the production of high performance lithium ion batteries. The resulting gel electrolyte GPE-AVM comprises a poly(acrylonitrile-co-vinyl acetate) copolymer blending poly(methyl methacrylate) as a host, which is swelled using a liquid electrolyte (LE) of 1 M LiPF₆ in carbonate solvent. Vinyl acetate and methacrylate groups segregate the PAN chains in the GPE, which produces high ionic conductivity (3.5 脳 10 ^鈥? S cm^鈥? at 30 掳C) and a wide electrochemical voltage range (>6.5 V) as well as an excellent Li⁺ transference number of 0.6. This study includes GPE-AVM in a full-cell battery comprising a LiFePO₄ cathode and graphite anode to promote ion motion, which reduced resistance in the battery by 39% and increased the specific power by 110%, relative to the performance of batteries based on LE. The proposed GPE-based battery has a capacity of 140 mAh g^鈥? at a discharge rate of 0.1 C and is able to deliver 67 mAh g^鈥? of electricity at 17 C. The proposed GPE-AVM provides a robust interface with the electrodes in full-cell batteries, resulting in 93% capacity retention after 100 charge鈥揹ischarge cycles at 17 C and 63% retention after 1000 cycles.

Keywords:

gel polymer electrolyte; lithium ion battery; poly(acrylonitrile); poly(methyl methacrylate); LiFePO₄ electrode