Enhanced discharge capacity and cycling properties in high-samarium, praseodymium/neodymium-free, and low-cobalt A2B7 electrode materials for nickel-metal hydride battery. (5th January 2015) - Cao, Zhijie
Abstract: A high-Sm, Pr/Nd-free, and low-Co La0.95 Sm0.66 Mg0.40 Ni6.25 Al0.42 Co0.32 alloy is reported as an A2 B7 -type electrode for Ni/MH batteries. The structural characteristics and electrochemical properties of this alloy have been investigated. La0.95 Sm0.66 Mg0.40 Ni6.25 Al0.42 Co0.32 is composed of La2 Ni7 and LaNi5 phases, and shows high discharge capacity and excellent cyclic property. The discharge capacity can reach 311.8 mAh/g and 227.0 mAh/g at large discharge currents of 2C and 5C, respectively, and 80% of the capacity is retained after 239 cycles at 1C. Highlights: A high-Sm, Pr/Nd-free, and low-Co La0.95 Sm0.66 Mg0.40 Ni6.25 Al0.42 Co0.32 alloy was prepared. This alloy showed a high discharge capacity (227.0 mAh/g at 5C). This alloy exhibited an excellent cyclic stability (80% after 239 cycles).