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Non-aqueous electrolyte solution, preparation method thereof and lithium ion battery

A non-aqueous electrolyte and lithium-ion battery technology, which is applied in the field of batteries, can solve the problems that the low-temperature discharge performance of the battery needs to be further improved, and achieve the effects of improving the normal temperature cycle of the battery, avoiding further contact, good rate performance and low-temperature discharge performance

Inactive Publication Date: 2021-01-22
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the above solutions all have the problem that after the electrolyte is prepared into a battery, the rate performance and low-temperature discharge performance of the battery need to be further improved.

Method used

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  • Non-aqueous electrolyte solution, preparation method thereof and lithium ion battery
  • Non-aqueous electrolyte solution, preparation method thereof and lithium ion battery

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Embodiment 1

[0047] This embodiment provides a non-aqueous electrolytic solution, which is composed of cyclic carbonates, chain carbonates, lithium salts and additives.

[0048] The additive is composed of a sulfonic anhydride additive and a non-sulfonic anhydride additive, the sulfonic anhydride additive is methylsulfonic anhydride, and the non-sulfonic anhydride additive is 1,4-butane sultone. The cyclic carbonate is ethylene carbonate, the chain carbonate is dimethyl carbonate, and the lithium salt is LiPF 6 .

[0049] The mass ratio of the cyclic carbonate and the chain carbonate is 1:2.5; the molar concentration of the lithium salt in the mixed solvent formed by the cyclic carbonate and the chain carbonate is 1.3mol / L; the sulfur The quality of anhydride additives is 0.5% of the total mass of lithium salts, cyclic carbonates and chain carbonates; the quality of non-sulfonic anhydride additives is the lithium salt, cyclic carbonates and chain carbonates 3.0% of the total mass.

[00...

Embodiment 2

[0053] This embodiment provides a non-aqueous electrolytic solution, which is composed of cyclic carbonates, chain carbonates, lithium salts and additives.

[0054] The additive is composed of sulfonic anhydride additives and non-sulfonic anhydride additives, the sulfonic anhydride additive is 2-thiophenesulfonic anhydride, and the non-sulfonic anhydride additives are 1,3-propane sultone and 1,4 - Butane sultone (the mass ratio of 1,3-propane sultone and 1,4-butane sultone is 1:2). The cyclic carbonate is γ-butyrolactone, the chain carbonate is ethyl methyl carbonate, and the lithium salt is LiPF 6 .

[0055] The mass ratio of the cyclic carbonate and the chain carbonate is 1:2; the molar concentration of the lithium salt in the mixed solvent formed by the cyclic carbonate and the chain carbonate is 1.0mol / L; the sulfur The quality of acid anhydride additives is 0.1% of the total mass of said lithium salt, cyclic carbonate and chain carbonate; the quality of said non-sulfoni...

Embodiment 3

[0057] This embodiment provides a non-aqueous electrolytic solution, which is composed of cyclic carbonates, chain carbonates, lithium salts and additives.

[0058] Described additive is made up of sulfonic anhydride additive and non-sulfonic anhydride additive, and described sulfonic anhydride additive is benzenesulfonic anhydride, and described non-sulfonic anhydride additive is adiponitrile and lithium difluorophosphate (adiponitrile and difluoro The mass ratio of lithium phosphate is 1:1). The cyclic carbonate is propylene carbonate, the chain carbonate is diethyl carbonate, and the lithium salt is LiPF 6 .

[0059] The mass ratio of the cyclic carbonate and the chain carbonate is 1:3; the molar concentration of the lithium salt in the mixed solvent formed by the cyclic carbonate and the chain carbonate is 1.5mol / L; the sulfur The quality of acid anhydride additives is 1.0% of the total mass of said lithium salt, cyclic carbonate and chain carbonate; the quality of said ...

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Abstract

The invention provides a non-aqueous electrolyte solution, a preparation method thereof and a lithium ion battery. The non-aqueous electrolyte solution comprises: cyclic carbonate, chain carbonate, alithium salt and additives, wherein the additives comprise a sulfonic anhydride additive and a non-sulfonic anhydride additive. The sulfonic anhydride additive and the non-sulfonic anhydride additivein the non-aqueous electrolyte solution cooperate with each other to generate a synergistic effect, films can be formed on the surfaces of a positive electrode and a negative electrode, the formed films are uniform and compact, oxidation of the electrolyte solution of the positive electrode under high voltage is inhibited, further contact between the electrolyte solution and the surface of a negative electrode material is avoided, side reactions are reduced, due to the fact that the film forming impedance is small, battery polarization is reduced, and good rate capability and low-temperature discharge performance are kept while normal-temperature circulation and high-temperature storage of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a nonaqueous electrolytic solution, a preparation method thereof and a lithium ion battery. Background technique [0002] As the charging cut-off voltage of the ternary material increases, the reactivity between the positive electrode material and the electrolyte also increases, causing the electrolyte to decompose and oxidize on the surface of the positive electrode, resulting in gas swelling, resulting in the normal temperature and high temperature cycle characteristics of the battery. , the safety and high temperature storage properties are reduced. These problems will reduce the interface performance between the positive electrode and the electrolyte, and it is necessary to develop functional electrolyte additives to improve the contact interface between the active positive electrode and the electrolyte. [0003] The thienyl sulfide compound can form a polythiophene film on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 邹志群曾汉民何巍刘建华刘金成
Owner EVE ENERGY CO LTD
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