化学合成法制备锌镍电池负极材料锌酸钙

Preparation of calcium zincate as negative electrode material for Ni/Zn battery by chemo-synthesis method

以摩尔比为1:2.02的Ca(OH)2和ZnO为原料,通过化学合成法制备锌酸钙。采用X射线衍射、热重分析、粒度分析、循环伏安以及模拟电池的充放电等方法,对制备的样品进行表征。研究结果表明:所制得锌酸钙样品的化学组成为Ca(OH)2.2Zn(OH)2.2H2O;样品的颗粒粒径分布均匀,平均粒径为23.18μm;以该锌酸钙为负极活性物质的模拟锌镍电池具有很高的放电平台,达到1.686 V;制得的锌酸钙的实际比容量为195.8 mA.h/g,达到了理论比容量的56.4%。

Calcium zincate was prepared by chemo-synthesis method from Ca（OH）2 and ZnO with the molar ratio of Ca（OH）2 to ZnO of 1：2.02. The sample was characterized by XRD, TGA, particle size analysis, cyclic voltammetry and charge-discharge test of simulated Ni/Zn battery. The results show that the chemical composition of sample is Ca（OH）2·2Zn（OH）2·2H2O. The sample consists of well dispersed particles with diameter about 23.18 μm. The simulated Ni/Zn battery has very high discharge plateau of 1.686 V, as well as a discharge capacity of 195.8 mA.h/g, which approaches 56.4% of the theoretical specific capacity.