双电层电容器电极平衡技术的研究

Study on the electrode's balance for electrochemical double-layer capacitor

以复合型活性炭为原料,通过拌浆、涂布、干燥及老化检测等工艺制备出正负电极厚度不同的方形双电层电容器,通过加速循环寿命测试分析了不同电极厚度双电层电容器体积比电容与内阻等方面的变化.结果表明:长时间的加速循环寿命测试会导致电容器隔膜变黄、变黑;当正极厚度大于负极时,双电层电容器具有更加稳定的电化学性能和更小的膨胀率.此外,在电容器负极厚度一定、电极平衡系数为0.20时,双电层电容器的综合性能最佳.

Cube-electrochemical double-layer capacitors with different electrode thickness have been prepared from composite activated carbons via slurry, vacuum dring, aging formation and so on. After accelerated cycle-lifetime＇s testing, we comprehensively analyzed the changes in specific capacitance and internal resistance. The result shows that after been accelerated cycling test for a long time, the separator became yellow and black, what＇s more, when the positive thickness was over negative side, the EDLC would embrace a more stable and much little expansion rate. Furthermore, if the negative side was fixed and the electrode balance coefficient is 0.2, the EDLC would exhibit an optimal performance.