摘要
研究了储氢合金(MlMg)Ni4-xCo0.7Znx(0≤x≤0.3)的气相储氢特性和电化学性能。结果表明,随着Zn含量的增加,合金吸、放氢(室温下)的平台压力降低,最大储氢量减少,分别从1.58%(x=0)减少到1.44%(x=0.2)、1.19%(x=0.3);合金的放电容量减少,分别从380mAh/g(x=0)减少到366mAh/g(x=0.1)、345mAh/g(x=0.2)、271mAh/g(x=0.3),但循环稳定性得到提高,经100次充放电循环后的容量衰减率从16%(x=0)降低到4%(x=0.3);适当控制Zn含量,既对合金的放电容量无大的影响,又可提高合金放电的稳定性,尤其是在大电流下放电的稳定性。
The gas hydrogen storage characteristics and electrochemical properties of (MlMg)Ni4-xCo0.7Znx (0≤x≤0.3) were studied. The results indicate that the absorption/desorption plateau pressures of the alloys lower and the highest hydrogen contents decrease from 1.58% (x=0) to 1.44% (x=0.2) and 1.19% (x=0.3) respectively with the increase of Zn in the alloys. The discharge capacities of the alloys decrease to a certain extent from 380 mAh/g (x=0) to 366 mAh/g (x=0.1), 345 mAh/g (x=0.2) and 271 mAh/g (x=0.3) respectively with the increase of Zn in the alloys, but their cycle stabilities are improved. The attenuation rate of capacity decreases from 16% (x=0) to 4% (x=0.3) after 100 charge/discharge cycles. The proper content of Zn influences the discharge capacity of the alloys a little, but promotes the discharge stability, especially at high current density.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2003年第2期428-431,共4页
The Chinese Journal of Nonferrous Metals
基金
国家教育部骨干教师基金资助项目
