体相掺钇、铝的α-Ni(OH)2的固相合成和高温电化性能  

High Temperature Electrochemical Performance of α-Ni(OH)_2 Doped with Aluminum and Yttrium by Solid-State Synthesis

作　　者：庄玉贵[1] 林东风[2] 杨吉满[1] 陈秀宇[1] 

机构地区：[1]福建师范大学福清分校,福建福清350300 [2]南开大学新能源材料化学研究所,天津300071

出　　处：《中国稀土学报》2008年第5期577-583,共7页Journal of the Chinese Society of Rare Earths

基　　金：福建师大福清分校科研基金(KY2007008)资助项目

摘　　要：固相法合成含不同Y^3＋的铝基α-Ni（OH）2样品的组成、晶相结构、表面形态等用XRD，SEM，FT-IR，AAS和CT等表征。用此材料组装成氢镍模拟电池。在不同温度下做了恒流充放电研究。结果表明，在30℃时Y^3＋使铝基α-Ni（OH）2电极材料的放电比容量稍有下降。而60℃时，在各实验倍率充放电情况下以掺Y（OH），摩尔含量1．2％为合适比例，它比不掺钇的铝基α-Ni（OH）2放电比容量要高出17％～29％。高温放电电位也有所改善。对电极材料的高温性能改善的机制也做了探讨。Al-doped α-Ni （OH）2 with different amounts of Y（OH）3 were prepared by the solid state synthesis to improve their high-temperature electrochemical performances. Their structure, morphology and composition were characterized by ASS, XRD, FT-IR, SEM and CT techniques. The simulated MH/Ni batteries were assembled. The constant current charge-discharge was studied at different temperatures. It wasshown that y^3＋ slightly decreased the specific capacities of the Al-doped a-Ni （OH）2 at 30 ℃, but increased the capacities by 17% - 29% at 60 ℃. The high-temperature discharge potential was improved. Based on the charge-discharge curves, the mechanism of the higher specific capacity of Al-doped a-Ni（OH）2 electrode caused by doping y^3＋ at high-temperature was also discussed.

关 键 词：固相法 Α-NI(OH)2 体相掺钇 高温性能 稀土 

分 类 号：TM912.2[电气工程—电力电子与电力传动]