Structure and electrochemical property of ball-milled Ti 0.26Zr 0.07Mn 0.1Ni 0.33V 0.24 alloy

Abstract

In present study, high-energy ball-milling (HEBM) is used in order to improve the cyclic stability and other electrochemical properties of Ti 0.26Zr 0.07Mn 0.1Ni 0.33V 0.24 alloy. The effect of the milling time on crystallographic and electrochemical characteristics of the alloy has been investigated systematically. From X-ray diffraction (XRD) patterns, it can be found that the ball-milled alloys retain their respective phase structures with increasing the ball-milling time from 30 min to 180 min. Electrochemical studies show that the cyclic stability of the ball-milled alloys is noticeably improved after charge–discharge cycles. The capacity retention rate C 40/ C max after 40 cycles increases from 46.3% ( t = 30 min) to 78.3% ( t = 180 min), although the maximum discharge capacity of the ball-milled alloys decreases moderately. Both electrochemical impedance spectra (EIS) and Potentiostatic discharge technique studies indicate that the electrochemical kinetics of the ball-milled alloys is improved with increasing the ball-milling time.