Structure and electrochemical properties of Ti 0.25V 0.35Cr 0.40− xNi x ( x=0.05–0.40) solid solution alloys

Abstract

The structure and electrochemical properties of Ti 0.25 V 0.35 Cr 0.40−x Ni x (x=0.05 –0.40) solid solution alloys have been studied in the paper. It is found that these alloys consist of a main solid solution phase with body centered cubic (bcc) structure and a little TiNi-based secondary phase. The solid solution alloys show easier activation behavior at 313 K as a negative electrode material for MH–Ni battery. With changing x from 0.05 to 0.30, the discharge capacity and the high-rate dischargeability increase. The discharge capacity increases with increasing temperature. The maximum discharge capacity is 240 mA h / g at 313 K for x=0.30 and 280 mA h / g at 343 K for x=0.15.