复合包覆Co(OH)_x+Yb(OH)_3的Ni(OH)_2正极材料的高温性能研究  

Performances of Nickel Hydroxide Coated with Co(OH)_x+Yb(OH)_3 at High-Temperature

作　　者：赫文秀[1,2] 安胜利[2] 张永强[2] 孙海峰[3] 杨慧[3] 蒋文全[3] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]内蒙古科技大学化学与化工学院,包头014010 [3]北京有色金属研究总院分析测试所,北京100088

出　　处：《中国稀土学报》2010年第4期464-470,共7页Journal of the Chinese Society of Rare Earths

基　　金：内蒙古自然科学基金(2009MS0204);内蒙古自治区高等学校科学研究项目(NJ09084)资助

摘　　要：化学共沉淀法合成氢氧化镍,并在表面用"梯度共晶法"复合包覆Co(OH)x+Yb(OH)3。XRD,XPS,SEM表征结果表明:制备的样品为六方球形β-N i(OH)2,表面包覆了Co(OH)x+Yb(OH)3,Co的存在形式应该主要为Co2+及少量的Co3+。65℃下0.2C,1C和3C恒电流充放电时,复合包覆Co(OH)x+2%Yb(OH)3的氢氧化镍的放电比容量和放电效率最大。大倍率充放电和循环稳定性等性能也得到改善。Nickel hydroxide was synthesized by chemical co-precipitation method,and the surface of particles Co（OH）x＋Yb（OH）3 was coated with the co-precipitation-gradient coating method.The results of XRD,XPS,SEM showed that,the nickel hydroxide coated with some Yb（OH）3 and Co（OH）x was β-Ni（OH）2 with hexagonal structure,and Co was in a form mainly Co2＋ and a small amount of Co3＋.The sample coated with Co（OH）x and 2%Yb（OH）3 showed that the maximum discharge capacity and the active material utilization at 65 ℃（0.2C,1C,3C）.The discharge cycling stability and discharge capacity of Ni（OH）2 coated with different amount of Yb（OH）3 were improved.

关 键 词：包覆 放电容量 循环性能 Yb(OH)3 稀土 

分 类 号：TQ150.7[化学工程—电化学工业]