覆钴层晶型对球形Ni(OH)_2电化学性能的影响  

Effects of crystal structures of cobalt compounds on electrochemical properties of spherical Ni(OH)_2

作　　者：杜晓华[1] 姜长印[1] 

机构地区：[1]清华大学核能技术设计研究院,北京102201

出　　处：《电源技术》2002年第5期346-347,396,共3页Chinese Journal of Power Sources

摘　　要：现代科技的发展要求蓄电池具有快速充放能力 ,镍电极活性材料Ni(OH) 2 的表面改性可以有效改善MH Ni电池的大电流充放电性能。利用积分进料工艺控制反应参数 ,在球形Ni(OH) 2 的表面包覆了不同晶型钴的化合物 ,并研究了包覆层化合物的晶型对样品电化学性能的影响。研究结果表明 ,与 β相Co(OH) 2 包覆层相比 ,α相Co(OH ) 2 包覆层的晶粒细小 ,结晶度较差 ,活化速度较快 ,活化程度也比较完全 ,能够更有效地提高活性材料的电化学性能。The large current charge/discharge property of Ni MH battery can be improved by the surface modification of active material Ni(OH) 2 for nickel electrode effectively. Cobalt compounds with various crystal structures were coated over the surface of spherical Ni(OH) 2 by means of integral feeding technology, and the effects of crystal structures of cobalt compounds on electrochemical properties of spherical Ni(OH) 2 were studied. The results show that compared with the β Co(OH) 2 coating layer, the α Co(OH) 2 coating layer can improve the electrochemical properties of Ni(OH) 2 active material more effectively because it has finer grain size, lower crystallinity, higher activation rate and more complete activation degree.

关 键 词：覆钴层晶型 电化学性能 蓄电池 氢氧化镍 表面改性 

分 类 号：TM912[电气工程—电力电子与电力传动]