Development of High Rate Capacitor by Optimizing Electrode Structure

在高倍率下，离子在电极平面方向的扩散阻力大大降低了电化学双电层电容器(EDLC)的放电速率。我们制作了具有穿透平面微通道的结构厚电极，并研究了结构电极对放电率的影响。制备了两种具有穿透平面微通道的结构电极：多柱形通道电极(MCE)和多层膜电极(MLE)，并测量了MCE和MLE的比电容。MLE的多圆柱形通道和多孔层起离子通道的作用。在高放电率区，MCE和MLE电极的比电容较普通电极有所提高，并考虑了离子通过颗粒内部和颗粒间的传质阻力，为EDLC的设计提供了指导。

At the high discharge rate, the diffusion resistance of ion in the through-plane direction of electrode greatly deteriorates the discharge rate of electrochemical double-layer capacitor (EDLC). We produced structured thick electrodes with through-plane microchannel, and investigated the effects of the structured electrodes on the discharge rate. Two types of structured electrodes with through-plane microchannel, multi-cylindrical-channel electrode (MCE) and multi-layered electrode (MLE) were prepared and the specific capacitance per weight of MCE and MLE were measured. Multi-cylindrical-channel and porous layer of MLE function as ion path. The specific capacitance of MCE and MLE was improved from that of a normal electrode in the high discharge rate region.We also built the model taking into acount mass transfer resistance of ion passing through the pore in the particle and between the particles in order to give the design guideline of EDLC.