Battery electrolyte, secondary battery and terminal

Abstract

The invention provides a battery electrolyte, which comprises an electrolyte salt and a non-aqueous organic solvent, and the non-aqueous organic solvent comprises a first organic solvent represented by a formula (I) and/or a second organic solvent represented by a formula (II): R1-S (= O) x-N (-R3)-R2 formula (I), r1-S (= O) x-N (-R3)-S (= O) y-R4 formula (II); r < 1 > and R < 4 > are independently selected from a fluoroalkyl group, a fluoroalkoxy group, a fluoroalkenyl group, a fluoroalkenyloxy group, a fluoroaryl group or a fluoroaryloxy group; r2 and R3 are respectively and independently selected from alkyl, alkoxy, alkenyl, alkenyloxy, aryl or aryloxy; x = 1 or 2; y = 1 or 2; and the total mass content of the first organic solvent and/or the second organic solvent in the electrolyte is 10-90%. The electrolyte contains the first organic solvent and/or the second organic solvent with relatively large mass content, so that the side reaction between the electrolyte and a negative electrode can be reduced, and the coulombic efficiency and the cycle performance of the battery are improved.

Description

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on December 16, 2020, with application number 202011490108.5 and titled "Battery Electrolyte, Secondary Battery, and Terminal," the entire contents of which are incorporated herein by reference. Applying. technical field [0002] The embodiments of the present application relate to the technical field of secondary batteries, in particular to a battery electrolyte, a secondary battery and a terminal. Background technique [0003] With the development of economy and technology, various products such as portable electronic devices (such as smartphones, digital cameras, and laptops), drones, and electric vehicles are in urgent need of energy storage devices with high energy density. The energy density of commercial lithium-ion batteries using graphite as the negative electrode material is close to the upper limit, but it still cannot meet the user's battery life and standby...

AI Technical Summary

Problems solved by technology

The energy density of commercial lithium-ion batteries using graphite as the negative electrode material is close to the upper limit, but it still cannot meet the user's needs for battery life and standby for the above-mentioned devices

Using anode materials such as silicon-based, tin-based and metal with higher theoretical capacity to partially or completely replace graphite anode is an effective way to increase the energy density of batteries. However, such anode materials with high theoretical capacity have high activity due to their large volume expansion. , in the process of charging and discharging the battery, a large amount of electrolyte will be consumed, resulting in low

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