Flame-retardant electrolyte for lithium ion battery and preparation method thereof

The invention provides a flame-retardant electrolyte for a lithium ion battery and a preparation method thereof, and relates to the technical field of an electrolyte for the lithium ion battery. The flame-retardant electrolyte for the lithium ion battery is prepared from the following raw materials of adiponitrile, dimethylacetamide, diacetic acid lithium borate, sodium sulfite, propylene carbonate, trimethyl phosphite, lithium salt, a filming agent, and a flame-retardant agent. The flame-retardant electrolyte for the lithium ion battery has the advantages that the burning and firing are avoided, and the safety of the lithium ion battery is effectively improved; the heat stability is obviously improved, and the discoloring and precipitate separation-out of the electrolyte are avoided whenthe electrolyte is stored for five months or more at the temperature of 50 DEG C. The lithium ion battery prepared by the electrolyte has the advantages that the flame-retardant property is good, thecyclic property is good, a