Lithium ion battery electrolyte capable of improving positive and negative electrode film formation

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as poor compatibility, affecting the performance of electrolytes and lithium-ion batteries, and improve film-forming performance , improve the electrochemical performance, improve the effect of cycle performance

Active Publication Date: 2020-06-19
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of poor compatibility between different additives is likely to occur, which in turn affects the performance of the electrolyte and lithium-ion batteries.

Method used

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  • Lithium ion battery electrolyte capable of improving positive and negative electrode film formation
  • Lithium ion battery electrolyte capable of improving positive and negative electrode film formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The lithium ion battery electrolyte of the present embodiment comprises additive, non-aqueous organic solvent, lithium salt, and non-aqueous organic solvent is ethylene carbonate, propylene carbonate, dimethyl carbonate and Composition of diethyl carbonate; Lithium salt is LiPF 6 , and its molar concentration in the electrolyte is 1.0mol / L. The second lithium salt is lithium difluorooxalate borate, the addition amount is 1%, and the additive is 5-cyanothiophene-2-boronic acid, whose mass is 1% of the electrolyte mass.

[0015] The preparation of the electrolyte is carried out in an argon glove box (moisture6 and lithium difluorooxalate borate were dissolved in the above-mentioned mixed organic solvent, and then 5-cyano-2-bromothiophene was added thereto, and the electrolyte solution 1 was obtained after uniform stirring.

Embodiment 2

[0017] The lithium-ion battery electrolyte of the present embodiment includes additives, non-aqueous organic solvents, and lithium salts. The non-aqueous organic solvents are composed of ethylene carbonate, propylene carbonate, and ethyl methyl carbonate with a mass ratio of 1:1:3; lithium Salt is LiPF 6 , and its molar concentration in the electrolyte is 1.0mol / L. The second lithium salt is lithium tetrafluoroborate, the additive amount is 0.5%, and the additive is 5-cyanothiophene-2-boronic acid, whose mass is 3% of the electrolyte mass.

[0018] The preparation method of the electrolyte solution in this embodiment refers to the method described in Example 1.

Embodiment 3

[0020] The lithium ion battery electrolyte of the present embodiment comprises additive, non-aqueous organic solvent, lithium salt, and non-aqueous organic solvent is dimethyl carbonate, 1,3-propane sultone, 1,3-propane sultone, Composition of propylene carbonate; Lithium salt is LiPF 6 , its molar concentration in the electrolyte is 1.0mol / L, the second lithium salt is lithium bisoxalate borate, its addition is 0.8%, the additive is 5-cyanothiophene-2-boronic acid, its mass is the electrolyte 2% of mass.

[0021] The preparation method of the electrolyte solution in this embodiment refers to the method described in Example 1.

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Abstract

The invention relates to a lithium ion battery electrolyte capable of improving positive and negative electrode film formation. The electrolyte comprises a non-aqueous organic solvent, a lithium saltand an additive, wherein the additive is 5-cyanothiophene-2-boric acid, the mass fraction of the 5-cyanothiophene-2-boric acid in the battery electrolyte is 0.5-3 percent, the mass fraction of the 5-cyanothiophene-2-boric acid in the battery electrolyte is 1-25, the non-aqueous organic solvent is the combination of at least two of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methyl formate, methyl acetate, methyl propionate, ethyl acetate, 1, 3-propane sultone, adiponitrile, succinonitrile, ethylene carbonate and propylene carbonate. There are two lithium salts, one lithium salt is lithium hexafluorophosphate with the molar concentration of 1 mol/L, and the other lithium salt is one of lithium difluorophosphate, lithium difluoroborate, lithium tetrafluoroborate and lithium bis (oxalato) borate. The lithium ion battery electrolyte has the advantages that the film forming performance of the lithium ion battery electrolyte on the surfaces of the positive and negative electrode materials is remarkably improved, and the cycle performance of the lithium ion battery under high voltage is improved.

Description

technical field [0001] The invention relates to the technical field of lithium electronic batteries, in particular to a lithium ion battery electrolyte that can improve positive and negative electrode film formation. Background technique [0002] As the application range of lithium-ion batteries becomes wider and wider, there are still many problems in its high-voltage resistance. At a voltage greater than 4.2V, various transition metals in the positive electrode material of lithium-ion batteries are in a relatively high oxidation state, which is easy to dissolve from the positive electrode material, thereby destroying the structure of the positive electrode material, and the dissolved metal ions will migrate through the electrolyte. to the negative electrode and destroy the SEI film on the surface of the negative electrode. At the same time, commonly used lithium-ion battery electrolytes are mostly carbonate organic solvents, and the SEI film formed on the surface of the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235Y02P70/50
Inventor 张二斌李娟茹小虎闫平安杨玉慧菅玉航张三成王琳王怀王乾
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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