Chelation treatment for reduced self-discharge in Li-ion batteries

摘要

The extent of self-discharge of rechargeable Li-ion secondary batteries is significantly reduced by treatment of LiMn2O4 intercalation compound electrode material with a chelating agent, such as acetylacetone. This treatment decreases the incidence of non-coordinated Mn-ion sites which can lead to battery electrolyte decomposition and resulting loss of battery capacity. The treatment, which also includes annealing at about 400 DEG C. to 800 DEG C., further prevents such decomposition by varying the surface area and topography of the potentially catalytic electrode material.