Y掺杂对氢氧化镍电极高温性能的影响  

Effects of Yttrium-Doping on High-temperature Electrochemical Performances of Nickel Hydroxide Electrodes

作　　者：任俊霞[1] 周震[1] 阎杰[1] 

机构地区：[1]南开大学新能源材料化学研究所,天津300071

出　　处：《物理化学学报》2007年第5期738-742,共5页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划项目(2002CB211800)资助项目

摘　　要：合成了内掺稀土元素Y的β-Ni(OH)_2和α-Ni(OH)_2材料,并通过XRD、TEM、CV和充放电测试等方法研究了Y元素对这两种晶型活性材料的结构、形貌以及高温电化学性能方面的影响,发现Y元素可显著提高β-Ni(OH)_2和α-Ni(OH)_2材料的高温性能,且作用机理相同,均是通过提高析氧过电位来改善镍电极的高温充电效率.但是α-Ni(OH)_2在高温下的相稳定性仍有待提高.Y-doped β-Ni（OH）2 and α-Ni（OH）2 materials were synthesized, and the influences of Y on the structure, morphology and high-temperature electrochemical characteristics of the two kinds of materials were studied through XRD, TEM, CV, and charging/discharging tests. The results indicated that yttrium improved high-temperature electrochemical performances of β-Ni（OH）2 and α-Ni（OH）2 materials by the same mechanism that the charge efficiency was enhanced through the increase of oxygen evolution overpotentials. However, further efforts are still necessary to improve the phase stability of α-Ni（OH）2 at high temperatures.

关 键 词：MH/NI电池 镍电极 高温性能 充电效率 稀土元素 

分 类 号：TM912[电气工程—电力电子与电力传动]