High capacity hydrogen storage alloy negative electrodes for use in nickel-metal hydride batteries

Rare earth-free V-based TiV2.1 xCrxNi0.3 (x = 0.4-1.0) alloys were prepared by arc-melting. All alloys were composed of two phases, the primary phase in which the V and Cr constituents were mainly distributed and the secondary phase in which the Ti and Ni constituents were mainly distributed. When the Cr content was increased, the maximum discharge capacity was decreased, but charge-discharge cycle durability was improved. The lower the charge-transfer resistance and the higher the specific discharge current at which the positive shift of potential at degree of discharge of 50% stagnates, the higher the HRD. In the present study, the TiV1.6Cr0.5Ni0.3 alloy electrode had the highest HRD. (C) 2015 Elsevier B.V. All rights reserved.