DESIGNED ELECTROLYTES AND ELECTRODE- ELECTROLYTE INTERFACES FOR HIGH PERFORMANCE LITHIUM-ION BATTERIES

摘要

Rechargeable lithium-ion batteries with high capacities,high rates,long cycle lives,wide temperature ranges,and improved safety are needed for numerous applications including electric vehicles, aircraft,and consumer electronics.To meet the performance and safety requirements,the electrolyte must provide adequate conductivity over the temperature range,a wide electrochemical stability window,and result in high capacities when used with cathodes and anodes.Current lithium-ion batteries utilize an electrolyte composed of a lithium salt(e.g.LiPF6)and organic solvents(e.g.ethylene carbonate,ethyl methyl carbonate,diethyl carbonate,etc.),and various additives(e.g.vinylene carbonate,etc.). The electrolyte composition is a compromise between these various factors,and different electrolyte compositions are needed depending on the specific application and its requirements(e.g.desired temperature range,electrode materials,rate,etc.)