Enhancement of specific capacity and charge/discharge cycle life properties for secondary zinc electrode

• Main Authors: ching li Wang, 王景立
• Other Authors: chun chen Yang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/14391360059160618875

碩士 === 明志科技大學 === 工程技術研究所 === 95 === Because Zn/air battery has the characteristic of the high energy density, large amount of Zn easy to obtain, low material cost, and the environmental trendily friendliness(no pollution problem), it become a new generation energy storing device. The secondary Zn/air battery can be reused for many cycles (at present above 50 cycles). For the secondary Zn electrode, the most serious problem of the secondary Zn-air battery is the shape change after discharge, the Zn electrode was oxidized from Zn to ZnO, the solubility of ZnO in KOH electrolyte is quite high. How to reduce the ZnO solubility in KOH solution, it becomes the key issue for the improvement of the Zn electrode during cycle test. The formation and the growth dendrites towards the positive electrode is another, it cause the battery short circuit at the charge period, for this reason the characteristic properties and mechanical strength of the polymer separator become an important factor. The main purpose of the thesis is focused on improving Zn utilization, coulomb efficiency, energy efficiency, and cycle ability of the secondary Zn electrode. The study topic is comprised of the composition of the Zn electrode, the electrolyte, and the polymer electrolyte membranes. The characteristic properties of secondary Zn electrode were will be evaluated by the electrochemical methods, such as AC impedance spectroscopy, Tafel kinetic analysis, galvanstatic charge/discharge method. In addition, the SEM, XRD, and EDX used to examine the properties of the Zn electrode. in order to find the optimum composition of the electrode, the electrolyte, and the polymer electrolyte membrane.