(1. 浙江大学 化学系， 杭州 310027；
2. 中国科学院 金属研究所 金属腐蚀与防护国家重点实验室， 沈阳 110015)
摘 要: 通过直接化学反应法、化学共沉淀法以及物理混合方法在可充锌电极活性物质—氧化锌中掺入钙添加剂，研究了锌电极的充放电特性、放电容量及循环寿命等电化学性能。SEM分析表明直接化学反应法制备的样品是基面为四角形的薄片，化学共沉积法制备的样品是基面为六角形的多面体。XRD分析表明两种化学反应方法制备的样品均为锌酸钙晶体，由于制备过程中晶体优先生长方向不同而具有不同的形状。电极充放电实验结果表明，掺钙锌电极的电化学性能明显优于无钙锌电极，化学掺钙对锌电极电化学性能的改善优于物理混合掺钙。X射线照片表明由锌酸钙组成锌电极的表面活性物质分布较均匀，不掺钙的锌电极经多次充放电循环后电极表面已基本上没有活性物质。
关键字: 锌负极； 氧化锌； 氢氧化钙； 锌酸钙；循环寿命
performance of pasted zinc electrode
（1. Department of Chemistry， Zhejiang University，
Hangzhou 310027， P.R.China;
2. State Key Laboratory for Corrosion and Protection，
Chinese Academy of Science,Shenyang 110015， P.R.China）
Abstract:Calcium additive was added into the active material (zinc oxide) of the pasted zinc electrodes using directly chemical reaction， chemical co-precipitation and physical mixture of zinc oxide and calcium hydroxide. SEM images show that the sample prepared by directly chemical reaction is tetragonal shape and the sample prepared by chemical co-precipitation is hexagonal shape. XRD analyses show that these two samples are calcium zincate crystals. Shapes of calcium zincate crystals result from different prior growth direction of crystal in the preparation process of calcium zincate. The charge/discharge performance， discharge capacity， cycle life and surface pattern of the pasted zinc electrodes were studied. Constant current charge/discharge and X-ray radiographs indicatethat the charge/discharge performance and surface uniformity of the pasted zinc electrodes with calcium zincate are better than those with physical mixture of zinc oxide and calcium hydroxide. The performance of the pasted zinc electrode with calcium additive is always prior to that of the calcium-free pasted zinc electrodes.
Key words: pasted zinc electrode； zinc oxide； calcium hydroxide； calcium zincate；cycle life
