| Title |
Electrode Characteristics of Laves Phase Hydrogen Storage Alloys |
| Authors |
김찬중(Chan Jung Kim) ; 이재명(Jae Myoung Lee) ; 김대용(Dai Ryong Kim) |
| Abstract |
In order to develope a high capacity hydrogen-absorbing alloys for Ni-MH secondary battery, charge and discharge characteristic, of Ti-based and Zr-based Laves phase alloys were investigated. Ti-based Laves phase alloys showed low discharge capacity because of their poor electrode catalysis and lower hydrogen diffusivity in the alloys. However, some Ti-based alloys revealed relatively high discharge capacities up to 200mAh/g indicating possibility to use as electrode materials by a modification of alloys. Zr-based alloys showed higher discharge capacities and better electrode characteristics than Ti-based alloys. In the Zr-based alloys. Zr_(0.4)Ti_(0.6)Mn_(0.4)V_(0.6)Ni_(0.8)Fe)(0.2) electrode exhibited remarkably improved discharge capacity of 385mAh/g, in the case of slow charge and discharge. However in order to use this alloy for MH electrode, it is necessary further improvement of charge and discharge rate capability and cycle life. |