鋅空氣電池之電解質開發;Electrolyte development of zinc air battery

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题名:	鋅空氣電池之電解質開發;Electrolyte development of zinc air battery
作者:	曾兪銜;TSENG, YU-HSIEN
贡献者:	材料科學與工程研究所
关键词:	枝晶狀結構;庫倫效率;鋅腐蝕;添加劑;膠態電解液;高濃度;dendritic structure;coulombic efficiency;zinc corrosion;additives;flexible electrolyte;high concentration
日期:	2018-10-18
上传时间:	2019-04-02 14:30:27 (UTC+8)
出版者:	國立中央大學
摘要:	研究從鋅空氣電池電解質的觀點切入，在水系電解質中，藉由使用複合添加劑以提高庫倫效率、降低鋅負極的腐蝕速率，並抑制充放電過程中鋅枝晶狀結構的生成，使電池充放電效率增加、循環使用壽命延長。發現四元添加劑為3000 ppm 1-Methylpiperazine、1500 ppm檸檬酸、6000 ppm酒石酸與50 ppm PEI能達到最高庫倫效率90.5%，降低腐蝕電流至196 μA/cm2，而從SEM形貌圖確定枝晶狀結構被抑制生成，呈現菱角狀的結構。希望鋅空氣電池能輕薄短小，利用聚合物電解質設計有利於鋅空氣電池的物理靈活性，防止電解質洩漏的問題。本研究膠態電解質的製程，使其更容易吸附鹼性電解液，在一般環境下，將零件疊壓成全電池就能進行充放電，不需考慮密閉性問題，在50 mA/cm2電流密度下，放電電壓約為1.1 V。尋求更高庫倫效率與抑制氫氣的產生，本研究利用高濃度雙三氟甲烷磺酰亞胺鋰(LiTFSI)有極大的幫助，能提高效率至96.3%，多次循環後庫倫效率幾乎不變，可以得知其穩定性很好，SEM形貌圖為蘚苔狀結構，不會形成枝晶狀結構。 ;This study cuts into the idea of zinc-air battery electrolyte. In the water-based electrolyte, the battery is charged by using a composite additive to improve the coulombic efficiency, reduce the corrosion rate of the zinc negative electrode, and inhibit the formation of zinc dendritic structure during charge and discharge. The discharge efficiency is increased and the cycle life is prolonged. It was found that the quaternary additive was 3000 ppm 1-Methylpiperazine, 1500 ppm citric acid, 6000 ppm tartaric acid and 50 ppm PEI to achieve a maximum coulombic efficiency of 90.5%, reducing the corrosion current to 196 μA/cm2, It was confirmed from the SEM topography that the dendritic structure was hindered from being generated, and a rhombohedral structure was exhibited. It is hoped that the zinc-air battery can be light and thin, and the polymer electrolyte design is beneficial to the physical flexibility of the zinc-air battery and the problem of electrolyte leakage. In this study, the process of colloidal electrolyte makes it easier to adsorb alkaline electrolyte. In the general environment, Charge and discharge the parts by stacking them into a full battery, regardless of the tightness problem.At a current density of 50 mA/cm2, the discharge voltage is approximately 1.1 V. Seeking higher coulombic efficiency and suppressing the generation of hydrogen, this study used the high concentration of lithium hexafluoromethane sulfonate (LiTFSI) to greatly improve the efficiency to 96.3%, and the coulombic efficiency was almost unchanged after repeated cycles. It can be known that its stability is very good, and the SEM topography is a moss-like structure, which does not form a dendritic structure.
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