(1. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001；
2. 哈爾濱工業(yè)大學(xué) 化工學(xué)院，哈爾濱 150001；
3. 江蘇雙登集團(tuán)有限公司，姜堰 225526；4. 長(zhǎng)虹集團(tuán)公司 軍事代表室，綿陽(yáng) 621000)
摘 要: 采用沉淀轉(zhuǎn)化法制備摻雜Co的納米Ni(OH)2，利用XRD和TEM分析材料的結(jié)構(gòu)和微觀形貌，利用循環(huán)伏安技術(shù)和恒流充放電技術(shù)研究材料的電化學(xué)性能尤其是高倍率放電性能。結(jié)果表明：摻雜Co后，納米Ni(OH)2仍為β晶型，但其結(jié)晶度和顆粒形狀均發(fā)生變化，顆粒的團(tuán)聚變得明顯，同時(shí)材料的晶格參數(shù)c和材料質(zhì)子擴(kuò)散系數(shù)D隨著摻雜量的增大呈先增大再減小的趨勢(shì)；當(dāng)Co摻雜量為5%(質(zhì)量分?jǐn)?shù))時(shí)，材料的c值最大，質(zhì)子擴(kuò)散系數(shù)D也最大，達(dá)到3.127×10−10 cm2/s，0.2C放電比容量達(dá)到312 mA·h/g，1C和5C放電比容量分別比未摻雜材料的提高7%和10%。
關(guān)鍵字: 納米材料；氫氧化鎳；沉淀轉(zhuǎn)化法；高倍率放電；鈷；摻雜
of nano-scale Ni(OH)2
（1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China;
3. Jiangsu Shuangdeng Group Co. Ltd, Jiangyan 225526, China;
4. Military Representative, Changhong Group Company, Mianyang, 621000, China）
Abstract:The nano-scale Ni(OH)2 doped with Co was prepared by precipitate transformation method, and its structure and morphology were characterized by XRD and TEM. The electrochemical performances, especially high rate discharge performance, of the material were investigated by cyclic voltammetry (CV) and constant current technology. The results indicate that the material doped with Co is still nano-scale β-Ni(OH)2, but the crystallinity and shape change to some extent, the agglomeration of particles becomes obvious, and the crystal lattice parameter c and the proton diffusion coefficient D assume regular change with the amount of Co-doping. The material doped with 5% Co (mass fraction) exhibits larger c value and proton diffusion coefficient (3.127×10−10 cm2/s), the discharge specific capacity of 0.2C is up to 312 mA·h/g, the specific capacity of 1C and 5C are enhanced by 7% and 10%, respectively, compared with that of the un-doped material.
Key words: nano material; nickel hydroxide; precipitate transformation method; high-rate discharge; cobalt; doping
