Suppression of electrochemical decomposition of electrolyte in lithium ion batteries using electrolyte containing vinyl group compounds

A liquid organic electrolyte system for lithium-ion batteries with graphite anode containing vinyl group compounds (vinyl butyrate, vinyl hexanoate, vinyl benzoate, vinyl crotonate and vinyl pivalate) as electrolyte additives has been studied. The decomposition of a propylene carbonate (PC) based electrolyte on the graphite electrode could be remarkably suppressed by the addition of vinyl butyrate (VB) additive, leading to the improvement of electrochemical performances of the cell. The correlation between the lowest unoccupied molecular orbitals (LUMO) energy and the reduction potential of the additives is roughly linear.