电解质
材料科学
阳极
环氧乙烷
化学工程
离子电导率
聚合物
准固态
锂(药物)
氧化物
分离器(采油)
电极
复合材料
共聚物
化学
色素敏化染料
内分泌学
工程类
物理化学
冶金
物理
热力学
医学
作者
Shengzhao Zhang,Tiantian Liang,Donghuang Wang,Yinghong Xu,Yongliang Cui,Jingru Li,Xiuli Wang,Xinhui Xia,Changzhan Gu,Jiangping Tu
标识
DOI:10.1002/advs.202003241
摘要
Abstract An elastic and safe electrolyte is demanded for flexible batteries. Herein, a stretchable solid electrolyte comprised of crosslinked elastic polymer matrix, poly(vinylidene fluoride‐hexafluoropropylene) (PVDF‐HFP), and flameproof triethyl phosphate (TEP) is fabricated, which exhibits ultrahigh elongation of 450%, nonflammability and ionic conductivity above 1 mS cm −1 . In addition, in order to improve the interface compatibility between the electrolyte and Li anode and stabilize the solid‐electrolyte interphase (SEI), a protecting layer containing poly(ethylene oxide) (PEO) is designed to effectively prevent the anode from reacting with TEP and optimize the chemical composition in SEI, leading to a tougher and more stable SEI on the anode. The LiFePO 4 /Li cells employing this double‐layer electrolyte exhibit an 85.0% capacity retention after 300 cycles at 1 C. Moreover, a flexible battery based on this solid electrolyte is fabricated, which can work in stretched, folded, and twisted conditions. This design of a stretchable double‐layer solid electrolyte provides a new concept for safe and flexible solid‐state batteries.
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