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Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same

A non-aqueous electrolyte, non-aqueous technology, used in secondary batteries, circuits, electrical components, etc., can solve the problems of high impedance, inability to balance high-temperature performance and low-temperature performance, and lack of high-temperature effects of low-impedance additives to reduce dissolution. , The effect of protecting the positive electrode

Pending Publication Date: 2022-03-01
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most lithium-ion battery products have the problem that high-temperature performance and low-temperature performance cannot be balanced. For this reason, additives are usually added to the electrolyte to improve the high-low temperature performance of lithium-ion batteries.
However, when the general additives have better high-temperature effects, the impedance is larger, and the high-temperature effects of low-impedance additives are lacking, so it is difficult to obtain a non-aqueous electrolyte for lithium-ion batteries with both high and low temperature performance.

Method used

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  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Control group 1 of embodiment 1

[0053] (1) Preparation of positive electrode sheet

[0054] Mix the positive electrode active material 4.3V NCM523, the binder polyvinylidene fluoride, and the conductive agent acetylene black according to the weight ratio of 97:1.5:1.5, add N-methylpyrrolidone (NMP), and stir under the action of a vacuum mixer until mixed The system forms a positive electrode slurry with uniform fluidity; the positive electrode slurry is evenly coated on an aluminum foil with a thickness of 10 μm; dried in a vacuum oven for 9 hours, and then rolled and cut to obtain the positive electrode sheet.

[0055] (2) Negative sheet preparation

[0056] Negative electrode active material graphite, thickener carboxymethylcellulose sodium (CMC-Na), binder styrene-butadiene rubber, conductive agent acetylene black are mixed according to the weight ratio 97:1:1:1, add deionized water, Under the action of a vacuum mixer, the negative electrode slurry is obtained; ...

Embodiment 2

[0092] Control group 1 of embodiment 2

[0093] (1) Preparation of positive electrode sheet

[0094] Mix the positive electrode active material 4.3V NCM523, the binder polyvinylidene fluoride (PVDF-5130), and the conductive agent acetylene black according to the weight ratio of 97:1.5:1.5, add N-methylpyrrolidone (NMP), and work in a vacuum mixer Stir until the mixed system becomes a positive electrode slurry with uniform fluidity; evenly coat the positive electrode slurry on an aluminum foil with a thickness of 10 μm; bake the above-mentioned coated aluminum foil in an oven with 5 different temperature gradients, and then It was dried in a vacuum oven at 100° C. for 9 hours, and then rolled and cut to obtain the desired positive electrode sheet.

[0095] (2) Negative sheet preparation

[0096] Negative electrode active material graphite, thickener carboxymethylcellulose sodium (CMC-Na), binder styrene-butadiene rubber, conductive agent acetylene black are mixed according to...

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Abstract

The invention provides a non-aqueous electrolyte for a lithium ion battery and the lithium ion battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte comprises a lithium salt and a non-aqueous organic solvent, and further comprises a compound as shown in a formula 1, the non-aqueous electrolyte further comprises at least one of a compound shown in the formula 2 or a compound shown in the formula 3. The electrolyte can protect the positive electrode, meanwhile, the negative electrode also plays a certain protection role, and the battery has better cycle performance, high-temperature storage performance and low-temperature performance.

Description

[0001] This application requires that the patent application number submitted to the State Intellectual Property Office of China on December 30, 2020 is 2020116287399, and the title of the invention is "a non-aqueous electrolyte for lithium-ion batteries and a lithium-ion battery including the non-aqueous electrolyte"; The application number is 2020116287562, and the title of the invention is "a non-aqueous electrolyte for lithium-ion batteries and a lithium-ion battery including the non-aqueous electrolyte". The full text of the above-mentioned two prior applications is approved The way cited is incorporated in this application. technical field [0002] The invention belongs to the technical field of electrolyte solution for lithium ion batteries, and in particular relates to a nonaqueous electrolyte solution for lithium ion batteries and a lithium ion battery including the nonaqueous electrolyte solution. Background technique [0003] Since its commercialization, lithium-i...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 曾长安李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD