High-Performance Electrospun Poly(vinylidene fluoride)/Poly(propylene carbonate) Gel Polymer Electrolyte for Lithium-Ion Batteries

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• 作者：Xueyan Huang ; Songshan Zeng ; Jingjing Liu ; Ting He ; Luyi Sun ; Donghui Xu ; Xiaoyuan Yu ; Ying Luo ; Wuyi Zhou ; Jianfeng Wu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：December 17, 2015
• 年：2015
• 卷：119
• 期：50
• 页码：27882-27891
• 全文大小：664K
• ISSN：1932-7455

文摘

A novel high-performance gel polymer electrolyte (GPE) based on an electrospun polymer membrane of poly(vinylidene fluoride)/poly(propylene carbonate) (PVdF/PPC) was prepared and investigated for high-performance lithium-ion battery applications. This study presents a methodology for introducing PPC into PVdF-based GPEs designed for high-performance lithium-ion batteries. SEM images and porosity measurements showed that the electrospun membrane had a uniform and highly interconnected porous structure with an average fiber diameter of 300鈥?50 nm. Such a morphology resulted in excellent electrolyte uptake amount (500 wt %) and retention in PVdF/PPC membrane. The DSC result indicated that the PVdF crystallinity was deteriorated by the incorporation of PPC. The PVdF/PPC electrospun membrane showed significantly higher ionic conductivity (4.05 mS路cm^鈥?) than that of the PVdF electrospun membrane (2.11 mS路cm^鈥?) at 30 掳C. The PVdF/PPC GPE was stable at a potential higher than 5.2 V (versus Li⁺/Li). The capacity of Li/CGE-20/LiFePO₄ was 160, 151, 133, 119, and 102 mAh g^鈥? at a charge/discharge rate of 0.1, 0.2, 0.5, 1, and 2 C, respectively.