Electrolyte and battery thereof

Abstract

The invention discloses an electrolyte and a battery thereof, the electrolyte comprises an electrolyte salt, an organic solvent and an additive, and the additive comprises at least one of an additive A, an additive B and an additive C; wherein the additive B is fluoroethylene carbonate; the additive C is two or more of vinylene carbonate, 1, 3-propane sultone, ethylene sulfate, butanedinitrile, adiponitrile, 1, 3, 6-hexane trinitrile, propene sultone, methylene methanedisulfonate, ethylene glycol bis (propionitrile) ether and fluorine-containing ether, and the additive C is one or more of ethylene carbonate, 1, 3-propane sultone, ethylene sulfate, butanedinitrile, adiponitrile, 1, 3, 6-hexane trinitrile, propene sultone, methylene methanedisulfonate, ethylene glycol bis (propionitrile) ether and fluorine-containing ether. The additive A has a structural general formula I shown in the specification, wherein R1 is any one of fluorine atoms, alkyl and alkyl substituents; r2 is any one of-CnH2n-and-Cn + 1H2n-, wherein n is greater than or equal to 1 and less than or equal to 5; and R3 to R5 are respectively selected from any one of alkyl and alkyl substitutes.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte and a battery thereof. Background technique [0002] A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Due to the advantages of high specific energy, no memory effect, long cycle life, and small self-discharge, lithium-ion batteries are widely used in digital, energy storage, electric vehicles and other fields. [0003] With the continuous upgrading of electronic products such as mobile phones and tablet comput...

AI Technical Summary

Problems solved by technology

However, under high voltage, the structure of the positive electrode material is unstable, and it is prone to oxidation reaction with the electrolyte.

However, the huge volume expansion of the silicon-based negative electrode material causes the repeated filming of the electrolyte to consume, deteriorating the battery cycle and high-temperature storage performance

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