Effects of various electrolyte additives on electrochemical deposition/dissolution of the anode in zinc secondary batteries

• Main Authors: Yu-ling Lin, 林玉羚
• Other Authors: Jeng-kuei Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/h2n5rc

碩士 === 國立中央大學 === 材料科學與工程研究所 === 103 === From the point of zinc-air battery electrolyte, we aim at solving the zinc anode dendritic structure which is formed during charge/discharge process, easing corrosion and enhance current efficiency in an alkaline aqueous solution. In this study, 6 M potassium hydroxide solution containing 25 g/L zinc oxide was added 3000 ppm of different additives found that by adding tartaric acid, can promote current efficiency from 75.3% to 83.8%. In morphology, after charge-discharge cycles, the solution adding citric acid has no significant dendritic structure. Adding CTAB, PEG 600 and PEG 1000 refine zinc grains and inhibit the formation of dendritic structure; XRD analysis also found that the diffraction intensity of basal plane (002) in Zn is lower compared no additives solution. In corrosion inhibition, polarization curves shows that organic acids such as EDTA, PEG of different molecular weight, ionic liquids anionic salts such as LiPF6, NaBF4, NaDCA, surfactants such as CTAB has a slowing effect of zinc corrosion additives, and PEG 1000 Additives make corrosion potential of zinc metal increased from -1.517 V to -1.489 V, the corrosion current decreased from 498.05 μA / cm2 to 159.87 μA / cm2 which has best property of anti-corrosion in Zn metal.