a non-aqueous electrolyte

Abstract

The invention discloses a non-aqueous electrolyte. The non-aqueous electrolyte comprises the following constituents based on mass: 10-20 parts of compound shown in structural formula (I), 5-12 parts of other lithium salts, 2-5 parts of 1,4-butanediol sulphate, 10-12 parts of adiponitrile, 15-25 parts of pimelicdinitrile, 10-15 parts of octanedinitrile, 8-20 parts of sebaconitrile, 20-40 parts of 4-fluorine-1,3-dioxolane-2-ketone, 5-10 parts of ethylene carbonate, 2-5 parts of propylene carbonate, 5-12 parts of fluoroethylene carbonate, 4-8 parts of carbonated hydroxybenzene olefin ester, 3-5 parts of overshoot resistant additive, 0.5-1.5 parts of flame retardant agent and 1-2 parts of hexamethyl disilazane or triphenyl phosphate. The lithium salts containing oxalate radial groups also can form a solid-state electrolyte membrane on the surface of a positive electrode, the high-voltage resistant performance of a battery can be improved; and the lithium salts containing the oxalate radial groups are friendly to an environment, and the environment cannot be polluted due to the electrolyte problem during disassembly and recycle of the battery.

Description

technical field [0001] The invention belongs to the technical field of new materials and electrochemistry, and in particular relates to a non-aqueous electrolytic solution. Background technique [0002] Lithium-ion batteries are famous for their high specific energy, no pollution, no memory effect, and long life. In recent years, lithium-ion batteries have attracted much attention and been promoted and applied. As small as electronic watches and mobile phones, as large as electric bicycles and automobiles, they are very popular. Even in military and aerospace fields, lithium-ion batteries are becoming more and more popular. Lithium-ion batteries have profoundly affected people's daily life and work. [0003] Both the positive and negative electrodes of lithium-ion batteries have high activity. For charged lithium-ion batteries, the negative electrode has high reducibility, and the positive electrode has high oxidative property. Without the protection of film-forming additi...

AI Technical Summary

Problems solved by technology

At high temperature, the reactivity of the positive and negative electrodes of the battery is further enhanced, and the side reaction speed between the electrolyte and the electrodes is accelerated, resulting in the decomposition of the electrolyte to generate a large amount of gas, which causes the battery to expand and deform and cause damage to electrical appliances

In severe cases, due to battery expansion and deformation, a short circuit occurs inside the battery or the battery package bursts, resulting in flammable electrolyte leakage, which may cause fire and other safety accidents.

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