A free-standing, self-assembly ternary membrane with high conductivity for lithium-ion batteries

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• 作者：Ting Feng ; Feng Wu ; Chuan Wu ; Xindong Wang ; Gensheng Feng ; Huiying Yang
• 关键词：Hyperbranched polyether ; Ionic liquid ; Lithium-ion batteries ; Membrane ; Polymer electrolyte
• 刊名：Solid State Ionics
• 出版年：2012
• 出版时间：3 August, 2012
• 年：2012
• 卷：221
• 期：Complete
• 页码：28-34
• 全文大小：1101 K

文摘

A kind of self-assembly ternary membrane, comprising the hyperbranched polyether, PVDF-HFP and ionic liquid, has been successfully prepared, and the resulting polymer electrolytes were fabricated for applications in lithium-ion batteries. The crystallinity and glass transition temperature (T_g) of the prepared polymer electrolytes were found to decrease with increase of the ionic liquid content, which were confirmed by XRD and DSC thermal analysis. The thermal stability and conductivity could be improved with addition of ionic liquid in the polymer electrolyte. The polymer electrolyte membranes were thermally stable at 320 ¡ãC, and the ionic conductivity can reach to 1.37 ¡Á 10^? 3 S¡¤cm^? 1 at room temperature. The electrochemical tests showed that the electrochemical stability of as-prepared polymer electrolyte was up to 4.9 V (vs. Li/Li⁺), and the Li/LiFePO₄ cell with the kind of polymer electrolyte delivered the initial discharge capacity of 101.6 mAh¡¤g^? 1.