核殼式陽極結構與電解液添加劑對鋅漿料空氣電池之電化學特性影響研究;Effects of core-shell anode structure and additives in electrolyte on the electrochemical performance of zinc slurry air battery

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Title:	核殼式陽極結構與電解液添加劑對鋅漿料空氣電池之電化學特性影響研究;Effects of core-shell anode structure and additives in electrolyte on the electrochemical performance of zinc slurry air battery
Authors:	黃識軒;Huang,Shih-Hsuan
Contributors:	機械工程學系
Keywords:	碳氈;核殼式結構;添加劑;鋅空氣電池;Carbon fiber;Core-shell structure;Additives;Zinc-air battery
Date:	2016-08-18
Issue Date:	2016-10-13 14:55:44 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究主要著重於開發高電容量鋅漿料空氣電池的開發與測試，分為三大研究部分如下：第一部分為改善金屬電極，採用核殼式結構鋅電極，以電極實驗部分利用水熱法鍍錫晶種搭配無電鍍化學還原法成長鋅金屬於碳氈上製備本研究之電極，根據掃描式電子顯微鏡(Scanning electrcon microscope, SEM)觀察得知，水熱法鍍錫晶種於碳氈上改善原本碳氈鍍鋅上去會有不均勻的缺點並可充分的發揮碳氈高比表面積的特性。第二部分則於電解液中加入添加劑去改善鋅的自腐蝕情況及抑制枝晶(dendrite)之形成；本研究分別使用五種添加劑EDTA、Tween20、Tartaric acid、SnCl2、BiCl3並以塔佛分析(Tafel plot)、循環伏安法(Cyclic voltammetry plot, CV)及SEM分析觀測電化學特性及表面形貌。第三部分則綜合上述兩部分組成鋅漿料空氣電池全電池進行電池特性分析，由一次放電測試可得知，核殼式陽極結構可成功傳遞電子進行鋅的氧化還原反應，而由循環充放電結果可知，Tartaric acid、Tween20無法有效抑制dendrite之產生並降低其電池之庫倫效率，故選擇一適當之添加劑為未來發展空氣電池之一大挑戰。;Secondary zinc slurry air battery has more and more attention due to their high energy density, low cost and environmental friendliness in recent. The primary zinc air battery has been used in small devices such as hearing aids, and the secondary one may be considered as one of potential candidates for a grid-scale energy storage device in the future. In this study, we attempted to develop a high capacity of zinc slurry air battery by three ways. In the first part, we prepared core-shell structure zinc anode on the carbon firber via hydrothermal method (Sn-modified) and electroless plating deposition (Zn-coating). The effects of reducing agent, working temperature and pH value on microstructural, morphological and electrochemical characteristic have been investigated using scanning electron microscope (SEM). Result from SEM, the carbon fiber was coated by an uniform Zn film after Sn-modified. In the second part, we used five additives (i.e., EDTA, Tween20, Tartaric acid, SnCl2 and BiCl3) into the battery electrolyte in order to avoid self-discharge and dendrite formation during the battery test, respectively. Tafel plot and cyclic voltammetry plot have analyzed the performance of these additives. Finally, base on above results, the core-shell structure zinc anode and these suitable additives were chosen to applied in the house-made rechargeable zinc air battery module. Result from battery performance, the core-shell structure zinc anode can improve capacity of Zn-air battery due to its high surface area of three dimension structure. It consequently improves the overall voltage efficiency mainly due to the utilization of higher surface area of three dimension structure than that of traditional zinc plate anode. However, some additives like Tartaric acid and Tween20 can′t inhibited the dendrite formation and decrease the Coulomb efficiency of battery. In the future work, development of suitable additives is an important issue in air battery.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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