纳米Ni(OH)_2的制备及其电化学性能

Preparation and electrochemical performances of nano-sized Ni(OH)_2

采用固相法制备了纳米 β Ni(OH) 2 ,采用Scherrer公式由其中一样品的 (10 0 )、(10 1)及 (110 )晶面参数计算得到晶粒尺寸分别为 11.1nm、3.6nm和 12 .1nm。采用循环伏安、恒电流充放电等技术对其电化学性能进行了初步研究 ,结果表明 :纳米Ni(OH) 2 的活性比较高 ,其首次容量达 2 0 7.9mA·h·g-1,第 2周期容量即达到最大值 2 4 0 .4mA·h·g-1,但其容量衰退较快。

Nano-sized β -Ni(OH)_2 powder was prepared using solid state reaction method, and the particle sizes of (100), (101) and (110) planes were 11.1 nm, 3.6 nm and 12.1 nm respectively, depending on Scherrer equation. By using cyclic voltammagraph and corresponding electrochemical measurements, the electrochemical performances of the electrodes using the nano-sized Ni(OH)_2 samples were studied. The results show that the electrochemical capacity of the electrode exhibits excellent activation properties. The first discharge capacity is 207.9 mA·h/g and the maximum capacity is 240.4 mA·h/g at the second cycle. However, the degradation of capacity is fast.