(中南大學 化學化工學院，長沙 410083)
摘 要: 采用化學沉積法在四邊形鋅酸鈣表面包覆一層金屬錫化合物。利用X射線衍射、掃描電子顯微鏡、電化學阻抗譜、Tafel曲線以及充放電循環(huán)(用做鋅鎳電池的負極材料)等方法，對包覆前后的鋅酸鈣樣品進行表征。結(jié)果表明：包覆物化學組成為CaSn(OH)6，該包覆物在鋅酸鈣的表面分布均勻，沉積較為致密；包覆后的鋅酸鈣材料具有更好的耐腐蝕性能，且其電化學循環(huán)性能良好，經(jīng)過135次循環(huán)后，電池放電容量仍保持設計容量的65.5%。
關(guān)鍵字: 鋅酸鈣；表面包覆；CaSn(OH)6；Tafel曲線；電化學性能
（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