(中南大学 化学化工学院，长沙 410083)
摘 要: 采用化学沉积法在四边形锌酸钙表面包覆一层金属锡化合物。利用X射线衍射、扫描电子显微镜、电化学阻抗谱、Tafel曲线以及充放电循环(用做锌镍电池的负极材料)等方法，对包覆前后的锌酸钙样品进行表征。结果表明：包覆物化学组成为CaSn(OH)6，该包覆物在锌酸钙的表面分布均匀，沉积较为致密；包覆后的锌酸钙材料具有更好的耐腐蚀性能，且其电化学循环性能良好，经过135次循环后，电池放电容量仍保持设计容量的65.5%。
关键字: 锌酸钙；表面包覆；CaSn(OH)6；Tafel曲线；电化学性能
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:Tin compound was coated on the surface of the calcium zincate by chemical deposition. The properties of the samples were characterized by XRD, SEM, EIS, Tafel plot, and charge-discharge test as the cathode materials for Ni/Zn battery. The results show that the chemical composition of coating material, CaSn(OH)6. CaSn(OH)6 can be tightly coated and distributed uniformly on the surface of calcium zincate. The CaSn(OH)6-coated calcium zincate has a better alkali-tolerant performance than pure calcium zincate. The CaSn(OH)6-coated sample shows a much better capacity retention, and it can be retained about 65.5% after 135 charge-discharge cycles.
Key words: calcium zincate; coating; CaSn(OH)6; Tafel plot; electrochemical properties
ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK
ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW