Chemical and Electrochemical Characterization of Polymer Gel Electrolytes Based on a Poly(alkylene oxide) Macromonomer for Application to Lithium Batteries
Chemical and Electrochemical Characterization of Polymer Gel Electrolytes Based on a Poly(alkylene oxide) Macromonomer for Application to Lithium Batteries
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基于聚环氧烷大分子单体的聚合物凝胶电解质在锂电池中的应用的化学和电化学表征
DOI：
10.1149/1.1393563
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发表时间：
2000
影响因子：
3.9
通讯作者：
M. Watanabe
中科院分区：
文献类型：
--
作者：
Michiyuki Kono;Eriko Hayashi;M. Nishiura;M. Watanabe
以分子设计的聚氧化亚烯三丙烯酸酯大单体和不同的液体电解质为原料制备了聚合物凝胶电解质。采用紫外辐射差示扫描量热法（UV-DSC）研究了该高分子单体在液体电解质中的交联动力学。结果表明，光引发交联反应在大单体浓度方面符合一级动力学。在适宜的紫外光强度和光引发剂浓度条件下，交联反应完全完成。制备的凝胶电解质在室温下具有3 mS/cm的高离子电导率，即使在-20℃时，加入1 M的libf4 /γ-丁内酯液体电解质也能保持1 mS/cm。除了使用lipf6作为电解质盐的情况外，观察到液体电解质的离子电导率与含有相应液体电解质的凝胶电解质的离子电导率之间存在线性关系。锂/凝胶电解质界面的界面电阻在很大程度上取决于凝胶中加入的液体电解质的种类。凝胶电解质在锂电池和锂离子电池中的初步应用结果表明，凝胶电解质具有较高的正极材料利用率和可循环性。
Polymer gel electrolytes were prepared from a molecularly designed poly(alkylene oxide) triacrylate macromonomer and different liquid electrolytes. The cross-linking kinetics of the macromonomer in a liquid electrolyte was studied by using differential scanning calorimetry equipped with ultraviolet light irradiation system (UV-DSC). It was revealed that the photoinitiated cross-linking reaction followed the first order kinetics in terms of macromonomer concentration. The cross-linking reaction finished completely under suitable conditions of ultraviolet (UV) light strength and photoinitiator concentrations. The gel electrolytes prepared exhibited a high ionic conductivity of 3 mS/cm at room temperature and kept I mS/cm even at -20°C, when 1 M LiBF 4 /γ-butyrolactone liquid electrolyte was incorporated in the gel. A linear relationship between the ionic conductivity of liquid electrolytes and that of the gel electrolytes containing the corresponding liquid electrolytes was observed, except for the case where LiPF 6 was used as an electrolyte salt. The interfacial resistances at the lithium/gel electrolyte interfaces were largely dependent on the kind of liquid electrolytes incorporated in the gels. Preliminary results of the application of the gel electrolytes to lithium and lithium-ion batteries implied high utilization of cathode material and cycleability.