| Summary: | 碩士 === 國立聯合大學 === 能源工程學系碩士班 === 106 === Zinc-air batteries with high energy density and low material cost have great potential for large-scale energy storage and electric vehicle applications. However, the power density and the round-trip efficiency of zinc-air batteries are the key factors for those applications. Most of the studies focus on the modified zinc electrode, oxygen reduction reaction/oxygen evolution reaction (ORR/OER) catalyst and electrolyte additive. Only a few literatures studied the battery configuration and structure of catalytic layer to increase the battery power density. Thus, this study is divided into two parts: one is the single cell design and optimization of zinc-air battery and the other is the modification of catalytic layer of ORR (oxygen reduction reaction). The first part studied the influences of the ratio of air/zinc electrode area, natural/forced convection, open-cell and closed-cell on the battery power density. The battery power density was improved from 30 mW cm-2 to 103 mW cm-2. Second part was studied ORR electrode. The ratio of PTFE and the carbon slurry, the mixing method were studied to reduce the carbon peeling off and electrode flooding problems. Using NaCl as the pore former in the activated carbon layer, the ORR electrode power density was increased from 28 mW cm-2 to 58 mW cm-2.
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