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Composite electrode plate of lithium ion battery, preparation method of composite electrode plate and lithium ion battery

A lithium-ion battery and composite electrode technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of unstable attachment of inorganic ceramic diaphragm layers, material dropping, and easy cracks in the diaphragm layer. To achieve the effects of improving safety performance and cycle life, overcoming unstable material, high safety performance and cycle life

Active Publication Date: 2014-10-29
HONOR DEVICE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the first aspect of the embodiment of the present invention provides a lithium-ion battery composite electrode sheet, which is used to solve the problem of unstable attachment of the inorganic ceramic diaphragm layer on the electrode sheet in the prior art, and the separation of the diaphragm during the winding and assembly process. The layer is prone to cracks and material drop problems, while improving the flexibility of the lithium-ion battery composite electrode sheet, improving the safety performance and cycle life of the lithium-ion battery

Method used

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preparation example Construction

[0048] In the second aspect, the embodiment of the present invention provides a method for preparing a lithium-ion battery composite electrode sheet, comprising the following steps: dispersing inorganic ceramic particles and a binder in an organic solvent, after grinding, adding organic fibers, and stirring to form Mixture, the melting point of the organic fiber is greater than 200°C, the diameter of the organic fiber is 0.1 μm to 10 μm, the length is 1 mm to 10 mm, and the mass of the organic fiber is 0.1% to 2% of the mass of the inorganic ceramic particles ;

[0049] Take an electrode sheet, the electrode sheet is composed of a current collector and an electrode active material coated on the surface of the current collector, uniformly coat the mixture obtained above on the electrode sheet, and dry at 60-100°C for 60 minutes to obtain a lithium-ion battery Composite electrodes.

[0050] The organic fiber is one or more of polyester fiber, polyamide fiber, polyvinyl alcohol ...

Embodiment 1

[0072]A preparation method for a composite negative electrode sheet for a lithium ion battery, comprising the steps of:

[0073] (1) Negative electrode sheet preparation

[0074] The mixture of 200 grams of negative electrode active material artificial graphite, 3 grams of binder styrene-butadiene rubber (SBR) and 3 grams of carboxymethyl cellulose (CMC) is added to 200 grams of water, then stirred in a vacuum mixer to form a uniform slurry . The slurry was uniformly coated on a 9-micron copper foil, then dried at 100° C., and rolled to obtain a negative electrode sheet with a thickness of 120 microns.

[0075] (2) Preparation of composite negative electrode sheets for lithium-ion batteries

[0076] Al with a particle size of 500nm 2 o 3 Powder and binder polyvinylidene fluoride-cohexafluoropropylene (PVDF-HFP) dispersed in acetone solvent, in which, Al 2 o 3 The mass ratio of powder and PVDF-HFP is 95:5. After grinding for 30 minutes, add polyacrylonitrile fibers with a...

Embodiment 2

[0083] A preparation method for a composite negative electrode sheet for a lithium ion battery, comprising the steps of:

[0084] (1) Negative electrode sheet preparation

[0085] The mixture of 200 grams of negative electrode active material artificial graphite, 3 grams of binder styrene-butadiene rubber (SBR) and 3 grams of carboxymethyl cellulose (CMC) is added to 200 grams of water, then stirred in a vacuum mixer to form a uniform slurry . The slurry was uniformly coated on a 9-micron copper foil, then dried at 100° C., and rolled to obtain a negative electrode sheet with a thickness of 120 microns.

[0086] (2) Preparation of composite negative electrode sheets for lithium-ion batteries

[0087] Al with a particle size of 500nm 2 o 3 Powder and binder polyvinylidene fluoride-cohexafluoropropylene (PVDF-HFP) dispersed in acetone solvent, in which, Al 2 o 3 The mass ratio of powder and PVDF-HFP is 95:5. After grinding for 30 minutes, add polyacrylonitrile fibers with ...

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Abstract

The invention provides a composite electrode plate of a lithium ion battery. The composite electrode plate of the lithium ion battery is composed of an electrode plate body and a diaphragm layer arranged on the surface of the electrode plate body, wherein the electrode plate body is composed of a current collector and an active electrode material, the surface of the current collector is coated with the active electrode material, the diaphragm layer is prepared from inorganic ceramic particles, a binder and organic fibers, the melting point of the organic fibers is larger than 200 DEG C, the diameter of the organic fibers is 0.1 micron to 10 microns, the length of the organic fibers is 1-10mm, and the mass of the organic fibers is 0.1-2% of that of the inorganic ceramic particles. According to the composite electrode plate of the lithium ion battery, the diaphragm layer is stably attached to the electrode plate body and has high heat stability, the problem in the prior art that the diaphragm layer easily cracks and falls during winding can be solved, the safety performance of the lithium ion battery can be improved, and the circulation service life of the lithium ion battery can be prolonged. The embodiment of the invention also provides a preparation method of the composite electrode plate of the lithium ion battery and the lithium ion battery comprising the composite electrode plate.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery composite electrode sheet, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, notebook computers and other fields due to their advantages such as light weight, small size, high working voltage, high energy density, high output power, high charging efficiency and no memory effect. [0003] Lithium-ion batteries usually consist of a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a casing. Among them, the material of the diaphragm is mainly porous polyolefin diaphragm, such as polypropylene, polyethylene film and multilayer composite film formed therefrom. As a lithium battery material, polyolefin separator technology is relatively mature. The limitation of this material is that its melting point is very low and its ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525H01M50/403H01M50/411H01M50/44H01M50/461Y02E60/10
Inventor 王成王圣杨胜男
Owner HONOR DEVICE CO LTD
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