| abstract |
The present invention relates to a process for the preparation of lithium dihydrogenphosphate (LiDFOP), trimethylsilylpropylphosphate (TMSPa), 1,3-propensulfone (PRS) and ethylene sulfate (Esa And at least one additive selected from the group consisting of a non-aqueous electrolyte and a non-aqueous electrolyte. According to the electrolyte additive for a lithium secondary battery of the present invention, the decomposition of PF6- on the surface of the anode, which may occur in a high-temperature cycling operation of the lithium secondary battery, can be suppressed and the oxidation reaction of the electrolyte can be prevented. The improvement and the swelling phenomenon can be suppressed. |