The variations of structure and electrochemical properties of Li1-xNi1-yMnyO2 (y=0 and 0.2) were studied as lithium was deintercalated from the materials. The LiNi1-yMnyO2 was prepared by easily available LiOH, Ni(OH)2 and ƒÁ-MnOOH under air flow. Exchange of nickel into the lithium site (3(a)site) made it difficult for the lithium ion to move through the lithium layer, and decreased the electrical capacity for cyclic charge/discharge. Partial substitution of manganese for nickel was effective in preventing abrupt changes of the lattice constant c and Ni-O distances as x increases, resulting in suppressing the phase transitions (hexagonal•m onoclinic•¨hexagonal). XPS, XANES and ESR analyses suggested that the charge compensation in charge/discharge of Li1-xNi0.8Mn0.2O2 could be attributed to changing valences of nickel.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.