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

A non-aqueous electrolyte and non-aqueous electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of high impedance, high-temperature performance and low-temperature performance, and lack of high-temperature effect of low-impedance additives, etc. problems, to achieve excellent high-temperature storage performance and low film resistance

Pending Publication Date: 2022-02-08
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 general additives have better high-temperature effects , the impedance is larger, and the high-temperature effect of low-impedance additives is 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
Comparison scheme
Effect test

Embodiment 1

[0088] Control group 1 of embodiment 1

[0089] (1) Preparation of positive electrode sheet

[0090] The positive electrode active material 4.4V lithium cobalt oxide (LCO), the binder polyvinylidene fluoride (PVDF), and the conductive agent acetylene black are mixed according to the weight ratio of 97:1.5:1.5, and N-methylpyrrolidone (NMP) is added. Stir under the action of a vacuum mixer until the mixed system forms a uniform fluid positive electrode slurry; evenly coat the positive electrode slurry on an aluminum foil with a thickness of 12 μm; bake the above-mentioned coated aluminum foil in an oven with 5 different temperature gradients Afterwards, it was dried in an oven at 120° C. for 8 hours, and then rolled and cut to obtain positive electrode sheets.

[0091] (2) Negative sheet preparation

[0092] Negative electrode active material graphite, thickener carboxymethylcellulose sodium (CMC-Na), binder styrene-butadiene rubber, conductive agent acetylene black are mixed...

Embodiment 2

[0126] Control group 1 of embodiment 2

[0127] (1) Preparation of positive electrode sheet

[0128] 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.

[0129] (2) Negative sheet preparation

[0130] 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 3

[0164] The control group 1 of embodiment 3

[0165] (1) Preparation of positive electrode sheet

[0166] The positive electrode active material 4.4V lithium cobalt oxide (LCO), the binder polyvinylidene fluoride (PVDF), and the conductive agent acetylene black are mixed according to the weight ratio of 97:1.5:1.5, and N-methylpyrrolidone (NMP) is added. Stir under the action of a vacuum mixer until the mixed system forms a uniform fluid positive electrode slurry; evenly coat the positive electrode slurry on an aluminum foil with a thickness of 12 μm; bake the above-mentioned coated aluminum foil in an oven with 5 different temperature gradients Afterwards, it was dried in an oven at 120° C. for 8 hours, and then rolled and cut to obtain the desired positive electrode sheet.

[0167] (2) Negative sheet preparation

[0168] Negative electrode active material graphite, thickener carboxymethylcellulose sodium (CMC-Na), binder styrene-butadiene rubber, conductive agent acetylene ...

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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 the non-aqueous electrolyte further comprises at least one of compounds as shown in a formula 1. The non-aqueous electrolyte further comprises at least one substance which has a synergistic effect with the compound shown in the formula 1. Through the synergistic effect of the substance and the compound, the negative electrode is protected to a certain extent while the positive electrode is protected. The battery has better high-temperature storage performance and cycle performance and also has good low-temperature performance at the same time.

Description

[0001] This application requires that the patent application number submitted to the State Intellectual Property Office of China on December 30, 2020 is 2020116287539, 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 202011628744X, and the name of the invention is "a non-aqueous electrolyte for lithium-ion batteries and a lithium-ion battery including the non-aqueous electrolyte"; the patent application number is 2020116312403, and the name of the invention is "a non-aqueous Electrolyte and lithium-ion battery including the non-aqueous electrolyte”; the patent application number is 2020116312441, and the invention title is “a non-aqueous electrolyte for lithium-ion batteries and a lithium-ion battery including the non-aqueous electrolyte” Priority to Priority Applications, the entirety of the above four prior applications are hereby incorporated by ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 曾长安李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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