Wide-temperature efficient anti-flaming electrolyte for lithium ion battery and preparation method thereof

Abstract

The invention discloses wide-temperature efficient anti-flaming electrolyte for a lithium ion battery. The wide-temperature efficient anti-flaming electrolyte for the lithium ion battery is prepared by the following raw materials by mass percentage: 80-85% of a non-aqueous organic solvent, 10-13% of lithium salt, 1-5% of a function additive, and 1-5% of an anti-flaming assistant, wherein the non-aqueous organic solvent is formed by mixing cyclic carbonate, dimethyl sulfite, dimethyl carbonate and Gamma-butyrolactone, wherein the mass ratio is 2-5:1-3:1-3:1; the lithium salt is lithium oxalyldifluroborate (LiODFB) and lithium bisoxalatoborate (LiBOB), wherein the mole ratio is 25-40:75-60; the function additive is ethylene carbonate ec and ethylene sulfate, wherein the mass ratio is 1:1-3; and the anti-flaming assistant is a fluoro-phosphonitrile compound. The wide-temperature efficient anti-flaming electrolyte has the better electrochemical stability within the working voltage range of the battery, the usability of the lithium ion battery containing the electrolyte from the low-temperature to the high-temperature is effectively improved, and the application range of the battery is more effectively widened.

Description

technical field [0001] The invention relates to the technical field of battery electrolyte and its preparation, in particular to a wide-temperature high-efficiency flame-retardant electrolyte for lithium-ion batteries and a preparation method thereof. Background technique [0002] Compared with traditional lead-acid batteries and nickel-cadmium batteries, lithium-ion batteries have the characteristics of high specific power, high specific energy, no memory effect, and long cycle life. . At present, lithium-ion batteries have occupied most of the energy market of portable electronic products such as mobile phones, digital cameras, notebook computers and camcorders, and have begun to enter the market of electric bicycles and cars, gradually attracting the attention of the field of electric vehicles. [0003] The operating temperature of traditional lithium-ion batteries is between -20 and 40°C, but due to the constraints of regions, climates, and special use requirements, the...

AI Technical Summary

Problems solved by technology

Among them, organophosphorus compounds as flame retardants have better flame retardant effect, low toxicity, and more researches. Although these flame retardants can reduce the flammability of the electrolyte, the electrochemical stability of these flame retardants in the battery is poor. Or its physical properties are poor, such as too high melting point, too high viscosity, etc., and the addition amount reaches 15%-40%, so most of them will have a negative impact on the electrical performance of the battery