采用硅氢加成交联的方法制备了具有网络结构的聚硅氧烷固体电解质,采用热重分析、交流阻抗、线性扫描伏安法对电解质进行表征,考察了锂盐含量以及温度对电解质离子电导率的影响。结果表明:电解质在常温下电导率最大可以达到1.74×10-4S/cm,热稳定性在220℃达到最佳,电化学窗口可达到5V(vs.Li/Li+);电解质与锂电极的稳定性较好。将聚合物电解质组装成LiFePO4/SPE/Li锂离子电池,电池在0.07C倍率下,充放电比容量达到160mAh/g,充放电平台在3.45V左右;在0.15C倍率下,电池循环26圈后,电池充放电比容量保持在134mAh/g,库伦效率保持在98%以上。
A series of polysiloxane-based conducting polymer electrolytes were prepared via crosslinking to form a solid network.The polymer electrolytes were characterized by thermogravimetric analysis,electrochemical impedance spectroscopy (EIS) and linear scanning voltammetry (LSV).The conductivity of SPEs effected by lithium salt concentration and temperature were investigated.The electrolytes exhibited a remarkably high conductivity of 1.74×10-4S/cm and electrochemical window of 5V(vs.Li/Li+) at room temperature.The electrolytes also had a good compatible with lithium anode.The LiFePO4/Li battery based on this polymer electrolyte showed a discharge of 160mAh/g at 0.07C with discharge plateau of 3.45V.After 26 cycles,a discharge capacity of 134mAh/g at 0.15C with columbic efficiency 98% was obtained.
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