Enhancement of cyclic stability for high voltage lithium ion battery at elevated temperature by using polyethylene-supported poly(methyl methacrylate − butyl acrylate − acrylonitrile − styrene) based novel gel electrolyte

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• 作者：Xueyi Luo^a ; Youhao Liao^a ; ^b ; ^{liaoyh@scnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{liaoyh@scnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Huili Xie^a ; Yunmin Zhu^a ; Qiming Huang^a ; Weishan Li^a ; ^b ; ^{liwsh@scnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Gel polymer electrolyte ; Cyclic stability ; Poly(methyl methacrylate-butyl acrylate-acrylonitrile-styrene) ; Elevated temperature ; High voltage lithium ion battery
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：220
• 期：Complete
• 页码：47-56
• 全文大小：1892 K

文摘

Gel polymer electrolyte (GPE) is able to solve the problem of poor cyclability for high voltage cathode such as LiNi_0.5Mn_1.5O₄ at elevated temperature to some extent, but the traditional GPE based on poly(vinylidene fluoride-co-hexafluoropropene) [P(VdF-HFP)] cannot meet the requirements in terms of ionic conductivity and electrochemical stability. A novel GPE, based on polyethylene-supported poly(methyl methacrylate-butyl acrylate-acrylonitrile-styrene) (P(MMA-BA-AN-St)/PE), is reported in this paper. Physical characterizations indicate that the polymer membrane has a better pore structure and higher electrolyte uptake, leading to the improved ionic conductivity of 2.7 × 10⁻³ S cm⁻¹ at 25 °C for resulting GPE. Electrochemical characterizations show that the developed GPE exhibits lower interfacial resistance with lithium electrode and higher oxidative decomposition potential (up to 5.3 V, vs. Li/Li⁺). In addition, LiNi_0.5Mn_1.5O₄ cathode shows excellent cyclic stability under 55 °C at 0.2C between 3 V and 4.9 V, in which the capacity retention of cathode combined with GPE is 81% after 150 cycles, compared with only 25% when using a liquid electrolyte.