(1. 內(nèi)蒙古科技大學(xué) 化學(xué)與化工學(xué)院，包頭 014010；
2. 北京有色金屬研究總院 分析測試所，北京 100088)
摘 要: 利用化學(xué)沉淀法在球形Ni(OH)2表面復(fù)合包覆Co(OH)2和Er(OH)3，利用XRD、SEM和恒電流充放電技術(shù)測試其結(jié)構(gòu)、表面微觀形貌和充放電性能。研究不同包覆量對其常溫和高溫性能的影響，確定最佳包覆比為1%(質(zhì)量分?jǐn)?shù))。循環(huán)伏安測試結(jié)果表明：包覆Er(OH)3的球形Ni(OH)2可以有效提高鎳正極在高溫環(huán)境下的析氧副反應(yīng)電位，從而抑制析氧副反應(yīng)的發(fā)生，最終提高鎳電極在高溫環(huán)境下的充電效率和活性物質(zhì)利用率。
關(guān)鍵字: 球形Ni(OH)2；充放電性能；高溫性能；Er(OH)3；包覆
spherical Ni(OH)2 coated with Co(OH)2 and Er(OH)3
（1. School of Chemistry and Chemical Engineering，Inner Mongolia University of Science & Technology,
Baotou 014010, China;
2. Analysis & Measurements Research Center, General Research Institute for Non-Ferrous Metals,
Beijing 100088, China）
Abstract:The spherical nickel hydroxide coated by Co(OH)2 and Er(OH)3 was prepared by chemical precipitation. The structure, surface microstructures and charge-discharge properties were analyzed by X-ray diffractometry, scanning electron microscopy and galvanostatic charge-discharge cycling technology. The optimum coating amount of was determined to be 1% (mass fraction) by comparing different amounts of coating on their electrochemical properties at room temperature and high temperature. The cyclic voltammetry results indicate that the coating of the erbium hydroxide on the spherical nickel hydroxide can enhance the potential of oxygen evolution at high temperature, and thus inhibit the occurrence of oxygen evolution. Simultaneously, the charge efficiency and the active material utilization of nickel hydroxide electrode are increase at high temperature.
Key words: spherical nickel hydroxide; charge-discharge properties; high-temperature performance; erbium hydroxide; coating
