Lithium ion battery fire retardation electrolyte and preparation method thereof

Abstract

The invention discloses a lithium ion battery fire retardation electrolyte, which comprises a lithium salt, an organic solvent, a flame retardant additive and a film forming additive. The invention further discloses a preparation method of the lithium ion battery fire retardation electrolyte. The preparation method comprises: sequentially adding 50-70 parts by weight of an organic solvent, 5-20 parts by weight of a film forming additive, and 10-30 parts by weight of a flame retardant additive into a stainless steel container, completely stirring to obtain a mixed solution, adding 8-15 parts by weight of a lithium salt into the mixed solution, and uniformly mixing so as to obtain the lithium ion battery fire retardation electrolyte. According to the present invention, the lithium ion battery fire retardation electrolyte has characteristics of low cost, fire retardation, high safety and high conductivity, and can meet the requirements of the lithium ion battery in the wide temperature range.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a 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 advantages of high specific energy, high specific power, no memory effect, long cycle life, etc., which makes lithium-ion batteries popular since their appearance in the 1990s. extensive attention. At present, lithium-ion batteries have occupied the energy market of portable electronic products such as mobile phones, digital cameras, PDAs and camcorders, and have begun to enter the electric bicycle market, gradually attracting the attention of the electric vehicle field. [0003] Although lithium-ion batteries have great advantages as power sources for electric vehicles and hybrid vehicles, lithium-ion batteries can still explode or burn when abused or...

AI Technical Summary

Problems solved by technology

Therefore, the issue of battery safety has become one of the limiting factors for the scale-up of lithium-ion batteries.

Compared with lithium batteries, the negative electrode of lithium-ion batteries replaces the active lithium metal with stable carbon materials, which greatly improves the safety of the battery, but there are still unsafe factors. For example, the commonly used electrolyte is flammable and the positive electrode The thermal stability of the material is low during overcharging, and lithium is deposited on the negative electrode under overcharging conditions. Under extreme conditions, the battery will spontaneously generate heat inside. When the heat generated is too late to dissipate, the battery will leak liquid, gas, and smoke. , or even burn or explode

At present, power batteries mostly use high-safety positive electrode materials, but because the electrolyte still uses flammable organic solvents, it will still be unsafe in the case of needle-punched leakage