Compositional optimization of vanadium-free hypo-stoichiometric AB2 metal hydride alloy for Ni/MH battery application

► A cost-effective MH alloy was developed to replace rare-earth based AB5. ► Composition of V-free AB2 alloy was optimized by the electrochemical performance. ► V-free alloy provides a better charge retention but a shorter cycle life comparing to V-containing AB2 alloy.