Development of High Rate Capacitor by Optimizing Electrode Structure

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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.