Investigation on high-safety lithium ion battery using polyethylene supported poly(methyl methacrylate-acrylonitrile-butyl acrylate) copolymer based gel electrolyte

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• 作者：Tingting Chen^a ; Youhao Liao^a ; ^b ; ^{liaoyh@scnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xianshu Wang^a ; Xueyi Luo^a ; Xiaoping Li^a ; ^b ; Weishan Li^a ; ^b ; ^{liwsh@scnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Poly(methyl methacrylate-acrylonitrile-butyl acrylate) ; Gel polymer electrolyte ; High voltage cathode ; High-safety ; Lithium ion battery
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 February 2016
• 年：2016
• 卷：191
• 期：Complete
• 页码：923-932
• 全文大小：2495 K

文摘

A novel copolymer, poly(methyl methacrylate-acrylonitrile-butyl acrylate) [P(MMA-AN-BA)], was designed for high-safety and high voltage lithium ion battery in this paper. The copolymer was synthesized by emulsion polymerization, the corresponding membrane was prepared through phase inversion method and the gel polymer electrolytes (GPEs) were obtained by immersing the membranes into 1 M LiPF₆ liquid electrolyte. The performances of the copolymer, the membranes and its GPEs were characterized by Fourier transform infrared spectra, nuclear magnetic resonance spectra, scanning electron microscope, energy dispersive spectroscopy, Brunauer–Emmett–Teller, mechanical stability, differential scanning calorimetry, thermogravimetric analyzer, electrochemical impedance spectroscopy, cyclic voltammetry and charge/discharge test. The results show that the copolymer is obtained through opening the double bonds CC of its monomers. The mechanical strength and thermal stability of PE separator are promoted by coating the developed copolymer. The PE-supported and copolymer coated membranes exhibit homogeneous and interconnected pore structure, which helps to present the highest ionic conductivity of 1.70 × 10⁻³ S cm⁻¹ for the corresponding GPE at room temperature. The GPE is electrochemically stable up 5 V, and shows the acceptable cyclic and rate performance when used in LiNi_0.5Mn_1.5O₄ cathode. The high performance of GPE assures the practical application of high voltage cathode in lithium ion battery.