Additive for lithium ion battery electrolyte, lithium ion battery electrolyte and lithium ion battery containing electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problem that the cycle life and storage of lithium-ion batteries cannot be balanced, and achieves the effects of being suitable for industrialized promotion and application, with a simple preparation method and a controllable process.

Active Publication Date: 2022-04-26
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a kind of additive for lithium-ion battery electrolyte, lithium-ion battery electrolyte and lithium-ion battery, particularly a kind of electrolyte that is used for lithium-ion battery containing additive, lithium ion battery provided by the invention The battery electrolyte can not only improve the cycle life of the battery but also improve the high-temperature storage performance, effectively solving the problem that the current lithium-ion battery cycle life and storage cannot be balanced

Method used

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  • Additive for lithium ion battery electrolyte, lithium ion battery electrolyte and lithium ion battery containing electrolyte
  • Additive for lithium ion battery electrolyte, lithium ion battery electrolyte and lithium ion battery containing electrolyte
  • Additive for lithium ion battery electrolyte, lithium ion battery electrolyte and lithium ion battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Electrolyte preparation: In a glove box filled with argon, ethylene carbonate, diethyl carbonate, and ethyl methyl carbonate were mixed in a mass ratio of EC:DEC:EMC=1:1:1, and then added to the mixed solution Slowly add 12.5wt% lithium hexafluorophosphate (LiPF 6), based on 1.25wt% lithium bisfluorosulfonimide (LiTFSI) based on the total weight of the electrolyte, and finally add 1.0wt% based on the total weight of the electrolyte with a compound shown in formula I, 5wt% fluoroethylene carbonate ( FEC) and 0.5wt% vinylene carbonate (VC), after stirring uniformly, the lithium-ion battery electrolyte of Example 1 is obtained.

[0088] Preparation of soft-pack battery: stack the prepared positive electrode sheet (active material lithium cobaltate), diaphragm, and negative electrode sheet (active material graphite) in order, so that the diaphragm is in the middle of the positive and negative electrode sheets, and wind up to obtain a bare cell; Put the bare cell into the a...

Embodiment 2～8

[0089] Embodiment 2~8 and comparative example 1~4

[0090] In Examples 2-8 and Comparative Examples 1-4, except that the proportions of the components of the electrolyte are added as shown in Table 1, the others are the same as in Example 1.

[0091] Referring to Table 1, Table 1 is the composition ratio of each component in the examples of the present invention and comparative examples

[0092] Table 1

[0093]

[0094]

[0095] Performance tests were performed on the lithium-ion soft-pack batteries prepared by using the electrolytes prepared in Examples 1-8 of the present invention and the lithium-ion soft-pack batteries prepared in Comparative Examples 1-4.

[0096] Relevant performance tests were carried out on the batteries and their electrolytes prepared in Examples 1-8 and Comparative Examples 1-4.

[0097] (1) High temperature cycle performance test: At 45°C, charge the divided battery to 4.40V at 0.7C constant current and constant voltage, cut-off current at 0...

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Abstract

The invention provides an additive for a lithium ion battery electrolyte. The additive comprises a compound with a structure as shown in a formula I and/or a formula II. The additive with the specific structure and group for the lithium ion battery electrolyte is an aromatic compound containing fluoroalkyl, fluorosilicon group, sulfonyl and nitrile group, and can effectively complex transition metal at a positive electrode end, inhibit the reaction activity of an electrode surface, stabilize the structure of a positive electrode material, reduce oxygenolysis of the electrolyte at a high temperature and improve the service life of the lithium ion battery. The high-temperature storage and thermal shock passing rate of the battery is improved; moreover, the interface stability can be improved, a low-impedance SEI film can be preferentially reduced and formed at the negative electrode of the battery, the charge-discharge process of the lithium ion battery is improved, and the cycle life is prolonged. Meanwhile, the preparation method provided by the invention is simple, controllable in process and more suitable for industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrolyte, relates to an additive for lithium ion battery electrolyte, lithium ion battery electrolyte and lithium ion battery, especially relates to an additive for lithium ion battery electrolyte, lithium ion battery electrolyte and Lithium-ion batteries containing the electrolyte. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. 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. Batteries generally use materials containing lithium elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 熊伟马斌陈杰杨山项海标
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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