表面包覆Yb(OH)3的Ni(OH)2正极材料的高温性能研究

稀有金属材料与工程, 2012, 41(7): 1129-1134.

表面包覆Yb(OH)3的Ni(OH)2正极材料的高温性能研究

1.内蒙古科技大学,内蒙古包头 014010

2.内蒙古科技大学,内蒙古包头 014010

3.内蒙古科技大学,内蒙古包头 014010

4.北京有色金属研究总院,北京 100088

基金项目: Scientific Research Project of Higher Education Institutions of Inner Mongolia(NGZZ 12101) Natural Science Foundation of Inner Mongolia(2012MS0205) Scientific Planning Project of Baotou(2011Z1006)

关键词：氢氧化镍 , 放电容量 , 充放电性 , 氢氧化镱

Study on the Performances of Nickel Hydroxide Coated with Ytterbium Hydroxide at High-Temperature

He Wenxiu ^1, , An Shengli ^2, , Zhang Yongqiang ^3, , Jiang Wenquan ^4,

1.内蒙古科技大学,内蒙古包头 014010

2.内蒙古科技大学,内蒙古包头 014010

3.内蒙古科技大学,内蒙古包头 014010

4.北京有色金属研究总院,北京 100088

Keywords： nickel hydroxide , discharge capacity , charge-discharge properties , ytterbium hydroxide

在氢氧化镍表面包覆氢氧化镱和氢氧化钴并用XRD、XPS、SEM和恒电流充放电技术进行表征.结果表明:β-Ni(OH)2为六方晶型,Co的存在形式主要为Co2+及有少量的Co3+.样品表面Co和Ni原子比大于8∶1.65℃下0.2、1和3C恒电流充放电时,表面包覆2％Yb(OH)3的样品放电容量和活性物质利用率最大.65℃时经过30次充放电循环后,在不同的充放电倍率下,表面包覆不同量Yb(OH)3的氢氧化镍的放电循环稳定性和放电容量随着Yb(OH)3含量的增加而增大.

The surface of nickel hydroxide [Ni(OH)2] coated with ytterbium hydroxide [Yb(OH)3] and cobalt hydroxide [Co(OH)2]were studied and characterized by XRD,XPS,SEM and constant current recharge technology.The results show that the structure of β-Ni(OH)2 is hexagonal,Co exists mainly in the form of Co2+ with a small amount of Co3+,and the atomic ratio of Co and Ni on the sample surface is more than 8∶1.The samples coated of 2 wt％ Yb(OH)3 show the maximum discharge capacity and active materialutilization rate at 65 ℃ (0.2,1,3 C).After 30 charge/discharge cycles,the discharge cycling stability and the discharge capacity of Ni(OH)2 coated with different contents of Yb (OH)3 are enhanced with increasing of content of Yb(OH)3 under different charge/discharge rates at 65 ℃.

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