(1. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001；
2. 哈尔滨工业大学 化工学院，哈尔滨 150001；
3. 江苏双登集团有限公司，姜堰 225526；4. 长虹集团公司 军事代表室，绵阳 621000)
摘 要: 采用沉淀转化法制备掺杂Co的纳米Ni(OH)2，利用XRD和TEM分析材料的结构和微观形貌，利用循环伏安技术和恒流充放电技术研究材料的电化学性能尤其是高倍率放电性能。结果表明：掺杂Co后，纳米Ni(OH)2仍为β晶型，但其结晶度和颗粒形状均发生变化，颗粒的团聚变得明显，同时材料的晶格参数c和材料质子扩散系数D随着掺杂量的增大呈先增大再减小的趋势；当Co掺杂量为5%(质量分数)时，材料的c值最大，质子扩散系数D也最大，达到3.127×10−10 cm2/s，0.2C放电比容量达到312 mA·h/g，1C和5C放电比容量分别比未掺杂材料的提高7%和10%。
关键字: 纳米材料；氢氧化镍；沉淀转化法；高倍率放电；钴；掺杂
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
