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Ion Transport and Interfacial Properties of a Novel Polymer Electrolyte
Author(s): 
Pages: 248-253
Year: Issue:  3
Journal: JOURNAL OF CHEMICAL ENGINEERING OF CHINESE UNIVERSITIES

Keyword:  聚合物电解质锂离子电池交流阻抗界面性质;
Abstract: 合成了聚(甲基丙烯酸甲酯-丙烯腈-甲基丙烯酸锂)(简记为PMAML)聚合物基质材料,以PMAML和聚偏氟乙烯混合物为基质制备了新型复合聚合物电解质,其中增塑剂为碳酸乙烯酯和碳酸二甲酯,锂盐是LiBF4.用刮刀在玻璃板上涂膜得到聚合物膜,把聚合物基质膜在电解质溶液中浸渍后成为聚合物电解质膜.采用限制扩散方法测试了电解质中离子的扩散系数,由稳态极化法测得了迁移数.所制聚合物电解质中锂离子的扩散系数和迁移数分别为2.67×10-7cm2·s-1和0.53.通过交流阻抗技术研究了聚合物电解质与电极间界面性质,Li/GPE/Li的界面阻抗随放置时间延长而增大,Li/GPE/MPCF的界面阻抗随电极的电位降低而减小.组装了聚合物电解质锂离子电池,测试结果表明, 该聚合物电解质具有较好的离子传输性质和电化学性能,能用作锂离子电池的电解质.
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