CaSn(OH)6的结构及其在锌镍电池中的应用

来源期刊:中南大学学报(自然科学版)2010年第1期

论文作者:杨占红 王升威 廖建平 胡俊 易师

文章页码:73 - 76

关键词:添加剂;锌酸钙;锌负极;循环伏安法;共沉淀

Key words:additive; calcium zincate; zinc electrode; cyclic voltammetry; coprecipitation

摘    要:为了改善锌负极的循环性能,采用共沉淀法合成CaSn(OH)6,并将其作为锌镍电池的负极添加剂,研究其对锌负极电化学性能的影响。研究结果表明:通过共沉淀方法合成的CaSn(OH)6粒度分布均匀,平均粒径在1 μm左右,并且具有较高的纯度;添加CaSn(OH)6的锌负极在循环过程中游离出了Ca(OH)2和金属锡等有益物质,并进一步与ZnO反应生成锌酸钙,降低了锌负极活性物质在电解液中的溶解性,从而显著提高了锌电极的循环性能;以CaSn(OH)6与ZnO的混合物为负极活性物质的模拟锌镍电池具有较高的放电平台和优良的循环性能,经过50次循环后,电池放电容量保持为起始容量的72.6%。

Abstract: In order to improve the cycling performance of zinc electrode, CaSn(OH)6 was prepared by coprecipitation method and added in zinc anode. The influences of CaSn(OH)6 on electrochemical properties of Zn/Ni batteries were studied. The results show that the sample is well dispersed particles with high purity and an average size of about 1 μm. Favorable substances of Ca(OH)2 and Sn appear during the cycling of zinc electrode containing CaSn(OH)6, Ca(OH)2 has continues to react with ZnO to produce calcium zincate, which can highly reduce the dissolvability of anode active materials and greatly improve the cycling performance of zinc electrode. The simulated Ni/Zn battery using CaSn(OH)6 and ZnO as the active material of zinc electrode has a high discharge plateau and an excellent cycling ability, and it can retain about 72.6% of initial discharge capacity after 50 charge-discharge cycles.

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