High-voltage performance of LiCoO2/graphite batteries with methylene methanedisulfonate as electrolyte additive

► MMDS is newly evaluated as an electrolyte additive. ► This additive tends to be decomposed on LiCoO2 cathode prior to the solvents. ► A highly ionic conductivity film can be formed using MMDS in the electrolyte. ► The cycle performance of LIB (3.0-4.5 V) can be improved using this additive.