一种复合聚合物电解质的性质表征

Characterization of a novel composite polymer electrolyte

基于新的微孔膜成型工艺制备了一种复合聚合物电解质,聚合物基质为聚乙烯基吡咯烷酮(PVP)与聚偏氟乙烯(PVDF)的复合物。对所制聚合物电解质的离子迁移性质和电化学稳定性做了表征。采用稳态电流法测量了聚合物电解质中锂离子的迁移数,测试结果为0.2。利用交流阻抗技术对聚合物电解质的电导率进行测试,室温下电导率可达到1.6mS·cm-1。锂盐的扩散系数由对称电池的限制扩散法测得,结果为4.8×10-7cm2·S-1。由线性伏安扫描实验测试了该聚合物电解质体系的电化学稳定性,结果表明在5.1V以下电解质性质稳定。

A novel polymer electrolyte based on the blend of PVDF and PVP was prepared by a new method. The transport properties and electrochemical stable performance was also characterized. The transference number of lithium ion in the polymer electrolyte is measured by the steady state current method, and the t+ is about 02. The conductivity of the polymer electrolyte is measured by impedance response technology and the conductivity is about 1.6 mS·cm-1 at ambient temperature. The diffusion coefficient of lithium salt is determined by the restricted diffusion experiment, and the electrochemical window is measured by linear scan voltammetry experiment. The diffusion coefficient and electrochemical window is about 4.8×10-7 cm2·s-1 and 5.1 V respectively.