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Application of organic coatings, pole pieces for lithium-ion batteries and their applications, lithium-ion batteries and their applications

A lithium-ion battery, organic technology, applied in non-aqueous electrolyte battery electrodes, coatings, secondary batteries, etc., can solve the problems of increased cost, increased complexity, limited volume energy density of lithium-ion batteries, etc., and achieves good infiltration. The effect of improving the electrochemical performance and reducing the internal resistance

Active Publication Date: 2021-11-05
REAL POWER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing commercial lithium-ion batteries all have separators, but the existence of separators not only increases the complexity of the production process, but also increases the cost. In addition, due to the limitation of the manufacturing process, the separator is a part that contributes little to the battery capacity. However, it occupies a large volume inside the lithium-ion battery, resulting in a limited volume energy density of the lithium-ion battery, which is not conducive to the development of lithium-ion batteries in the direction of high energy density.

Method used

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  • Application of organic coatings, pole pieces for lithium-ion batteries and their applications, lithium-ion batteries and their applications
  • Application of organic coatings, pole pieces for lithium-ion batteries and their applications, lithium-ion batteries and their applications
  • Application of organic coatings, pole pieces for lithium-ion batteries and their applications, lithium-ion batteries and their applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] 1. Application of organic coatings as separators in the preparation of lithium-ion batteries

[0092] The organic coating is formed by curing the paint, which includes 20g of vinylidene fluoride-hexafluoropropylene copolymer, 210g of acetone and 34.4g of ethanol.

[0093] 2. Preparation of coating

[0094] Add 20 g of vinylidene fluoride-hexafluoropropylene copolymer powder into 210 g of acetone solution, dissolve the copolymer powder and heat at 50° C. for 1.2 hours to obtain a transparent and uniform mixed solution. Further, 34.4 g of ethanol was added to the mixed solution to form a blended solution, and the formed blended solution was heated at 50° C. for 0.8 hours to obtain a coating for coating.

[0095] 3. Pole pieces for lithium-ion batteries

[0096] ① Coating the negative electrode active material layer on the surface of the negative electrode sheet

[0097] The preparation of negative electrode slurry: mix according to the weight ratio of negative electrod...

Embodiment 2

[0107] 1. Application of organic coatings as separators in the preparation of lithium-ion batteries

[0108] The organic coating is formed by curing the paint, which includes 10g of vinylidene fluoride-hexafluoropropylene copolymer, 105g of acetone and 27g of ethanol.

[0109] 2. Preparation of coating

[0110] Add 10 g of vinylidene fluoride-hexafluoropropylene copolymer powder into 105 g of acetone solution, dissolve the copolymer powder and heat at 50° C. for 1 hour to obtain a transparent and uniform mixed solution. Further, 27 g of ethanol was added to the mixed solution to form a blended solution, and the formed blended solution was heated at 50° C. for 1 hour to obtain a coating material for coating.

[0111] 3. Pole pieces for lithium-ion batteries

[0112] ① Coating the negative electrode active material layer on the surface of the negative electrode sheet

[0113] Preparation of negative electrode slurry: mix according to the weight ratio of negative electrode act...

Embodiment 3

[0123] 1. Application of organic coatings as separators in the preparation of lithium-ion batteries

[0124] The organic coating is formed by curing the paint, which includes 10g of vinylidene fluoride-hexafluoropropylene copolymer, 105g of acetone and 34.4g of ethanol.

[0125] 2. Preparation of coating

[0126] Add 10 g of vinylidene fluoride-hexafluoropropylene copolymer powder into 105 g of acetone solution, dissolve the copolymer powder and heat at 50° C. for 1.5 hours to obtain a transparent and uniform mixed solution. Further, 34.4 g of ethanol was added to the mixed solution to form a blended solution, and the formed blended solution was heated at 50° C. for 0.5 hour to obtain a coating for coating.

[0127] 3. Pole pieces for lithium-ion batteries

[0128] ① Coating the negative electrode active material layer on the surface of the negative electrode sheet

[0129] Preparation of negative electrode slurry: mix according to the weight ratio of negative electrode act...

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Abstract

The invention provides an application of an organic coating, a pole piece for a lithium-ion battery and its application, a lithium-ion battery and its application, and belongs to the technical field of lithium-ion batteries. The invention provides an application of an organic coating as a separator in the preparation of a lithium-ion battery; the organic coating is formed by curing a coating, and the coating includes the following components by weight: vinylidene fluoride-hexafluoropropylene copolymer 9-11 Parts, 90-120 parts of solvent and 15-40 parts of non-solvent. The invention also provides the pole piece for the lithium ion battery coated with the organic coating, and provides the lithium ion battery comprising the pole piece. The organic coating of the present invention has a microporous structure, has good wettability to the electrolyte, can reduce the internal resistance, and improves the electrochemical performance of the battery. The lithium-ion battery obtained by coating the pole piece with the organic coating does not need a diaphragm, thereby greatly The space utilization rate inside the lithium-ion battery cell is improved, and the volumetric energy density of the lithium-ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an application of an organic coating, a pole piece for a lithium ion battery and its application, a lithium ion battery and its application. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, long cycle life and no pollution. They have been widely used in smart phones, digital cameras, notebook computers and new energy electric vehicles. With the development of digital products in the direction of lighter and thinner, and the continuous increase of the cruising range requirements of new energy electric vehicles, these products have put forward higher and higher requirements for the energy density of lithium-ion batteries. [0003] The current lithium-ion battery structure mainly includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. Between any adjacent positive electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/426H01M50/417H01M4/13H01M10/0525C09D127/16H01M50/411
CPCH01M4/13H01M10/0525C09D127/16H01M50/411Y02E60/10
Inventor 唐永炳许天军
Owner REAL POWER IND LTD
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