电池用氧化锌的制备及其性能研究

Preparation and Performance of Zinc Oxide Used in the Batteries

通过络合沉淀法制备了可充锌电极的活性物质－氧化锌，采用ＸＲＤ、ＳＥＭ和ＢＥＴ等方法对样品进行了表征，并应用充放电方法测试了其电化学活性．实验考察了反应液pＨ值和氨水浓度等主要工艺参数对样品性能的影响，并从理论上讨论了其影响原因．ＳＥＭ照片与比表面积数据表明，样品颗粒是许多微晶的聚集体，具有较高的比表面积，因而其电化学活性较高．在最佳的合成条件下，制备出了具有较高堆积密度（＞１．７０g·ｃｍ－3）和电化学放电比容量＞４２０ｍＡｈ·ｇ－１的氧化锌样品．

The active material of secondary zinc electrode (zinc oxide) was synthesized by the complexation-precitation method, and characterized by XRD, SEM and BET. The electrochemical activity of the product was determined by the charge-discharge method. The effects of some important preparative conditions such as the pH value of reaction solution and the content of aqueous ammonia, in the tank on the performance of the product were studied by experimental investigation and theoretical analysis. The SEM photographs and BET data show that the samples consist of the aggregates of many tiny crystals and have larger specific surface area, therefore, their electrochemical capacities axe higher. The zinc oxide sample obtained under the optimum preparative conditions possesses a tapping density higher than 1.70g.cm(-3) and an electrochemical discharge capacity higher than 420mAh.g(-1).