▎ 摘　　要

NOVELTY - The preparation method of an ultralow-temperature graphite-based lithium-ion battery electrolyte involves: taking 50-90 pts. wt. glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and 1,3-dioxolane and mixing, and rotationally stirring for 30 minutes to prepare a solvent; taking lithium trifluoromethanesulfonate, lithium hexafluorophosphate, lithium difluoro(oxalate)borate, lithium bis(trifluoromethanesulfonyl)imide and lithium bis(trifluoromethanesulfonyl)imide, adding the solvent, stirring, and waiting for the solution to be cooled to room temperature; and adding the semi-finished electrolyte, dissolving all the salts, uniformly mixing becomes transparent, and cooling after room temperature. USE - Preparation method of an ultralow-temperature graphite-based lithium-ion battery electrolyte used in portable electronic product, national defense, aerospace and polar exploration. ADVANTAGE - The electrolyte has simple synthesis technology and low reaction energy consumption, and is beneficial to large-scale commercial production. The electrolyte can not be solidified at the temperature of -100 ℃, has higher ionic conductivity, and can enable a lithium-ion half-cell assembled by a graphite cathode and lithium metal to be rapidly charged and discharged at low temperature (≤ -40℃). The electrolyte has high oxidation stability. DESCRIPTION OF DRAWING(S) - The drawing shows a graphite lithium half cell assembled by using the electrolyte synthesized. (Drawing includes non-English language text).