Crystal structural and electrochemical properties of Ti0.17Zr0.08V0.35Cr0.10Ni0.30−xMnx (x = 0–0.12) alloys

To get the Ni–MH batteries used within wide temperature with high discharge capacity, the crystal structural and electrochemical properties of Ti0.17Zr0.08V0.35Cr0.10Ni0.30−xMnx (x = 0–0.12) alloys were investigated. The partial substitution of Ni by Mn remains the crystal structure of these alloys, and they are still composed of bcc phase and C14 Laves phase. Both the lattice parameter and phase abundance of bcc phase decrease slightly, however, those of C14 Laves phase increase. The discharge capacity, the exchange current density and limit current density of these alloy electrodes at 298 K enhance obviously, but the electrochemical cyclic stability, the rate dischargeability and the polarization resistance decrease with increasing Mn content. Also, the electrochemical properties of these alloy electrodes at 273 K and 343 K were examined. The results show that Ti0.17Zr0.08V0.35Cr0.10Ni0.25Mn0.05 (x = 0.05) compound has a good performance, which maybe has a potential application within the wide temperature.