Electrochemical properties of M1Ni3.5Co0.6Mn0.4Al0.5-x wt% Mm0.89Mg0.11Ni2.97Mn0.14Al0.20Co0.54 composites

• Published in: Rare metals 2015-05, Vol.34 (5), p.338-343
• Main Authors: Huang, Hong-Xia, Li, Guo-Hui, Wang, Xin-Ying, Li, Yin, Teng, Xing, Qi, Ting
• Format: Article
• Language: English
• Subjects: Biomaterials; Chemistry and Materials Science; Energy; LaNi5; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Physical Chemistry; 交换电流密度; 储氢合金; 单晶X-射线衍射; 新型复合材料; 极限电流密度; 电化学性能; 高倍率放电性能
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-014-0384-2

In order to improve the overall electrochemical properties of ABs-type storage alloys, the new type composite alloys M1Ni3.5Co0.6Mn0.4Al0.5-x wt% Mm0.89Mg0.11Ni2.97Mn0.14Al0.20Co0.54 （x = 0, 5, 10; M1 means mischmetal） were prepared by means of ball milling. The composite alloys are shown to be single LaNi5 phase by X-ray diffraction （XRD） patterns. The maximum discharge capacity slightly increases from 315 mAh·g^-1 for M1Ni3.5Co0.6Mn0.4Al0.5 to 324 mAh·g^-1 （x = 5） and 325 mAh·g^-1 （x = 10）. The addition of AB3-type La-Mg- Ni-based alloy has a positive effect on the cycle stability. With the addition of Mm0.89Mg0.11Ni2.97Mn0.14-Al0.20Co0.54 alloy, the exchange current density （I0）, the limiting current density （IL） and the diffusion coefficient of hydrogen （D） of the alloy electrodes increase, leading to a corresponding improvement of the high rate dischargeability.