高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (12): 2256.

• 论文 • 上一篇    下一篇

添加元素对AB2型Laves相合金电化学性能的影响

韩树民1,2, 赵敏寿1,2, 吴来磊1, 郑炀曾1   

  1. 1. 燕山大学环境与化学工程系, 秦皇岛 066004;
    2. 中国科学院长春应用化学研究所, 稀土化学与物理重点实验室, 长春 130022
  • 收稿日期:2002-12-24 出版日期:2003-12-24 发布日期:2003-12-24
  • 通讯作者: 韩树民(1962年出生),男,硕士,教授,从事镍氢电池负极材料研究.E-mail:hanshumin@yahoo.com.cn E-mail:hanshumin@yahoo.com.cn
  • 基金资助:

    国家自然科学基金(批准号:20171042);中国科学院稀土化学与物理重点实验室基金资助

Effect of Additive Elements on Electrochemical Properties of AB2-type Laves Phase Alloys

HAN Shu-Min1,2, ZHAO Min-Shou1,2, WU Lai-Lei1, ZHENG Yang-Zeng1   

  1. 1. Department of Environmental and Chemical Engineering; Yanshan University, Qinhuangdao 066004, China;
    2. Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2002-12-24 Online:2003-12-24 Published:2003-12-24

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摘要： 比较系统地研究了AB2型Laves相合金Zr0.9Ti0.1Ni0.1Mn0.7V0.3M0.1(M=None,Ni,Mn,V,Co,Cr,Al,Fe,Mo,Si,C,Zn,Cu和B)的相结构和电化学性能以及高温和低温放电性能等.结果表明,14种合金均具有六方C14型Laves相的主相晶体结构,同时,含有少量立方C15型Laves相和一些由Zr0.9Ni11及ZrNi组成的非Laves相;添加V和Mn可提高AB2合金的放电容量;添加B和Mn则显著提高了AB2合金的高倍率放电性能和低温放电容量;添加Al,C,Si和Co对合金电极的循环稳定性改善明显;而Mn,Ni,V,Fe,Cu,Mo和B等却不同程度地降低了循环稳定性;添加Si,Mo,V,Cr和Al可明显改善合金电极的自放电性能;添加Si,Cr,V可显著改善AB2合金电极的高温放电性能.讨论了各种添加元素影响合金性能的可能原因.

关键词: Laves相合金, 添加元素, 电化学性能, 贮氢合金

Abstract: For examining the effect of the additive elements on the AB2-type Laves phase alloys Zr0.9Ti0.1Ni0.1Mn0.7V0.3M0.1(M=None, Ni, Mn, V, Co, Cr, Al, Fe, Mo, Si, C, Zn, Cu and B), the phase structure, the electrochemical capacity, high rate dischargeability, charge retention, cycling stability, high-temperature and low-temperature dischargeability of the alloys have been investigated. The XRD results show that all alloys consist of a large amount of the hexagonal C14Laves phase along with a small level of the cubic C15Laves phase and some non-Laves phases. The addition of Vand Mn increases the discharge capacity of the AB2alloy electrodes and the high rate capacity, and low-temperature dischargeability is dramatically increased with Band Mn addition, the Zr0.9Ti0.1Ni1.1Mn0.7V0.3B0.1exhibited the discharge capacity of 200mAh/g at discharge current of 1320mA/g. It is found that a small amount ddition of Al, C, Si and Co greatly improved the cycle life, but addition of Mn, V, Ni, Fe, Cu, Mo and Bdecreased the cycling stability of the AB2alloy electrodes to some extent, especially addition of Mn resulted in decreasing of cycling stability drastically. The addition of Si, Mo, V, Cr and ALIs useful to improving self-discharge characteristics. Considerable improvement in the high-temperature dischargeability was observed by addition of Si, Cr and V, the discharge capacity was up to 210 mAh/g at 65 ℃ for Zr0.9Ti0.1Ni1.1Mn0.7V0.3Si0.1alloy electrode.

Key words: Laves phase alloy, Addition of elements, Electrochemical properties, Hydrogen storage alloy

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