Abstract: A series of multi component, low cobalt and cobalt free AB 5 type hydrogen storage alloys were examined for lowering Ni MH batteries raw materials cost. The effect of partial substitution of alloy components on the electrochemical properties was also investigated. The results show that a partial substitution of Co by a small amount of iron, copper and chromium is very effective in improving the electrochemical cycling stability in the La(NiMnCoAl)5 Alloy. A satisfactory cycling stability is obtained with an alloy composition of La(NiMnAl)4.6(FeCuCr)0.2Co0.2 , which has a maximum capacity of 296 mA·h/g at a rate of 0.2C and whose capacity decay is 21.8% after 300 cycles at 1.0C rate. In addition, the alloys microstructure was examined by X ray diffraction.
Preparation and electrochemical properties of low-Co AB5-type hydrogen storage alloys
Abstract：
A series of multi component, low cobalt and cobalt free AB 5 type hydrogen storage alloys were examined for lowering Ni MH batteries raw materials cost. The effect of partial substitution of alloy components on the electrochemical properties was also investigated. The results show that a partial substitution of Co by a small amount of iron, copper and chromium is very effective in improving the electrochemical cycling stability in the La (NiMnCoAl) 5 Alloy. A satisfactory cycling stability is obtained with an alloy composition of La (NiMnAl) 4.6 (FeCuCr) 0.2 Co 0.2 , which has a maximum capacity of 296?mA·h/g at a rate of 0.2C and whose capacity decay is 21.8% after 300 cycles at 1.0C rate. In addition, the alloys microstructure was examined by X ray diffraction.
