镍
电极
阴极
材料科学
电化学
介电谱
无机化学
氢化物
氢氧化物
扫描电子显微镜
金属
化学工程
化学
冶金
复合材料
物理化学
工程类
作者
Jing Li,Enbo Shangguan,Dan Guo,Quanmin Li,Zhaorong Chang,Xiao‐Zi Yuan,Haijiang Wang
标识
DOI:10.1016/j.jpowsour.2014.03.134
摘要
In this paper, a novel additive, calcium metaborate (CMB), is proposed to improve the high-temperature characteristics of the nickel electrodes for nickel–metal hydride batteries. As a soluble calcium salt, CMB can easily and uniformly be dispersed in the nickel electrodes. The effects of CMB on the nickel electrode are investigated via a combination of cyclability, capacity retention, electrochemical impedance spectroscopy, scanning electron microscope and X-ray diffraction. Compared with conventional nickel electrodes, the electrode containing 0.5 wt.% CMB exhibits superior electrode properties including enhanced discharge capacity, improved high-rate discharge ability and excellent cycle stability at an elevated temperature (70 °C). The improved cell performance of the nickel electrode containing CMB additives can be attributable to the increased oxygen evolution overvoltage and slower oxygen evolution rate. Compared with insoluble calcium salts, such as Ca(OH)2, CaCO3, and CaF2, CMB is more effective as a cathode additive to improve the high-temperature performance of Ni–MH batteries.
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