稀土Nd^(3+)与Cu^(2+)掺杂非晶态纳米Ni(OH)_2材料的电化学性能  

Electrochemical performance of rare earth Nd^(3+) and Cu^(2+)-codoped material of amorphous nano-Ni(OH)_2

作　　者：李广燕[1] 刘长久[1] 吴华斌[1] 赵卫民[1] 

机构地区：[1]桂林工学院材料与化学工程系,广西桂林541004

出　　处：《化学工程》2009年第12期55-58,共4页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(20563001);广西科学研究与技术开发计划项目(桂科能05112001-2A1);广西研究生教育创新人才基地资助项目(200718);广西研究生教育创新计划资助项目(2008105960817M21)

摘　　要：晶态氢氧化镍[Ni(OH)2]在碱性电解液中易发生相变,影响其电化学性能。文中采用微乳液快速冷冻共沉淀法制备Nd3+和Cu2+复合掺杂非晶态纳米Ni(OH)2粉体材料,并对其结构形貌及物理特性进行表征分析。结果表明,制备出的非晶态Ni(OH)2样品材料,微结构含有较多结晶水,物相近似球形,粒径大小在20—30nm。对样品电极材料的电化学性能测试发现,掺杂Nd3+和Cu2+的摩尔比为2∶1时,所制备的样品材料合成镍电极,并组装成MH-Ni模拟电池,在恒电流80mA/g下充电6h,40mA/g放电,终止电压为1.0V的充放电条件下,放电比容量高达348.0mA.h/g,放电中值电压为1.2723V,同时样品电极材料的氧化还原可逆性较好,电极过程的电化学阻抗较小。电化学性能优于目前MH-Ni生产应用的晶态β-Ni(OH)2电极材料。The crystalline nickel hydroxide is easily phase-changed in alkalescent electrolyte and its electrochemical performances are affected. The Nd3 ＋ and Cu2 ＋ -codoped material of amorphous nano-Ni（OH） 2 was prepared by the method of rapid freezing precipitation of micro-emulsion. The structure and physical characteristics of the samples were characterized. The results show that the sample powder synthesized by this method is amorphous, which contains a large amount of crystal water and its shape is similar to spherical shape with the average particle size of 20-30 nm. The electrochemical performances of this electrode material were also studied. When the mole ratio of Nd3＋ to Cu2＋ was 2 ： 1, the sample powder was prepared as the nickel electrode material, and then assembled into the MH-Ni simulation battery. Under the conditions that it is charged at 80 mA/g for 6 h and discharged at 40 mA/g to the final voltage 1.0 V, the discharge specific capacity is as high as 348.0 mA · h/g, and the middle discharge voltage is 1. 272 3 V; the circle reversibility is good and the electrochemical impedance in the electrochemical reaction is small. The electrochemical performances of this samples are much better than those of β-Ni（OH） 2 applied in MH-Ni production.

关 键 词：微乳液快速冷冻共沉淀法 Nd3+和Cu2+复合掺杂 非晶态纳米Ni(OH)2材料 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]