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

摘要:

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3 C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。

Abstract:

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 material utilization rate at 65 °C (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 °C.