聚合物电解质与锂电极界面的阻抗谱分析  

Electrochemical impedance spectra analysis on interface characteristics between polymer composite electrolyte and lithium electrode

作　　者：刘玉文[1,2] 李小龙 张翠芬[1] 黄玉东[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院 [2]广东省江门三电池实业有限公司博士后工作站,广东江门529000 [3]广东省江门三电池实业有限公司博士后工作站

出　　处：《电源技术》2004年第9期533-537,共5页Chinese Journal of Power Sources

摘　　要：研究了聚合物电解质/锂金属界面的阻抗谱的特点,与液态电解质体系相结合建立了合理的而且具有普适性等效电路。利用等效电路对Li/GPE/Li模拟电池的阻抗谱进行了拟合,确定了阻抗谱的中频圆弧对应的界面阻抗中要是电荷转移阻抗,钝化膜阻抗为几个欧姆数量级。分析了锂金属表面钝化膜的生长对界面电荷转移阻抗和扩散阻的影响。The characteristics of electrochemical impedance spectra (EIS) of Li/GPE(gel polymer electroyte ) interface were studied. The equivalent circuit of Li electrode/ GPE/ Li electrode was applied to explain the EIS plots of Li/GPE and Li/liquid electrolyte interface. The results showed that the equivalent circuit could fit the experimental data very well. The simulation data of Li/GPE/Li cell were analyzed. It was determined that the middle frequency semicircle mainly corresponded to the charge transfer resistance(Rct) between passivation layer and Li electrode, since resistance of passivation layer was in the order of several Ohm. According to the simulation data, effect of the forming passivation layer on Rct and Rdiff (resistance of the diffusion) was analyzed.

关 键 词：聚合物电解质 金属锂 电化学阻抗谱 界面 

分 类 号：TM912.9[电气工程—电力电子与电力传动]