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Positive plate of lithium ion battery, and preparation method and application thereof

A technology for lithium ion batteries and positive electrode sheets, which is applied in electrode manufacturing, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of unilateral warping of the diaphragm, easy blocking of the pores of the diaphragm, complicated processes, etc., so as to improve the air permeability. , improve the stability, the effect of simple process

Inactive Publication Date: 2016-01-06
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the technical solution of this patent application, organic solvents such as NMP and ethanol are used for coating. In addition, the inorganic coating and the organic coating need to be coated separately, and the process is relatively complicated.
[0004] Chinese Patent Application Publication No. 103441230A published on August 21, 2013 discloses an organic / inorganic composite porous separator, which includes a porous substrate and an organic / inorganic composite coating. The process is simpler than the above patent and can be coated at one time. Complete, and water is used as the solvent. However, since the substrate is an organic porous membrane material, the coating and drying process needs to be precisely controlled, otherwise it will cause one side of the membrane to warp and easily block the pores of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of positive electrode sheet:

[0033] Lithium cobaltate (positive electrode active material), conductive agent superconducting carbon (Super-P), and adhesive polyvinylidene fluoride (PVDF) are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a lithium ion battery with a certain viscosity The positive electrode slurry is coated on the aluminum foil of the current collector, dried at 85° C., then cold pressed and cut into a suitable size; then the tabs are welded to form the positive electrode sheet of the lithium ion battery.

[0034] Preparation of positive electrode coating:

[0035] 0.6 parts by mass of dimethyl carbonate (plasticizer), 6 parts by mass of polyvinylidene fluoride (PVDF) powder and 63 parts by mass of deionized water were added to the double planetary mixer and stirred for 1 hour; 0.4 parts by mass of carboxymethyl were added Base cellulose was mixed at 45° C. for 0.5 hours; then 30 parts by mass of alumina (average particle size of 2 μm) was...

Embodiment 2

[0043] The positive electrode sheet, the negative electrode sheet, the separator, the non-aqueous electrolyte, and the battery cell were formed in the same way as in the comparative example. Only the positive electrode sheet coating was prepared as follows:

[0044] 0.6 parts by mass of dimethyl carbonate (plasticizer), 6 parts by mass of polyvinylidene fluoride (PVDF) powder and 63 parts by mass of deionized water were added to the double planetary mixer and stirred for 1 hour; 0.4 parts by mass of carboxymethyl were added The base cellulose was mixed at 45°C for 0.5 hours; then 30 parts by mass of calcium carbonate (average particle size of 2 μm) was added, and stirred at room temperature for 2 hours to obtain an organic / inorganic composite slurry.

[0045] The surface of the positive pole piece is coated by screen printing. After the coating is completed, it is dried in an oven at 50 degrees. The thickness of the coating after drying is 12um.

Embodiment 3

[0047] The positive electrode sheet, the negative electrode sheet, the separator, the non-aqueous electrolyte, and the battery cell were formed in the same way as in the comparative example. Only the positive electrode sheet coating was prepared as follows:

[0048] 0.4 parts by mass of methyl isobutyl ketone, 4 parts by mass of polyacrylonitrile powder and 60 parts by mass of deionized water were added to the double planetary mixer and stirred for 1 hour; 0.2 parts by mass of polymethyl acrylate were added and mixed at 45°C 0.5 hour; then add 20 parts by mass of calcium oxide (average particle size of 1 μm) and stir at room temperature for 2 hours to obtain an organic / inorganic composite slurry.

[0049] The surface of the positive pole piece is coated by screen printing. After the coating is completed, it is dried in an oven at 50 degrees. The thickness of the coating after drying is 1um.

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Abstract

The invention discloses a positive plate of a lithium ion battery, and a preparation method and application thereof. A coating layer made of a composite coating material is arranged on the surface of a positive plate substrate, and the composite coating material mainly comprise the following constituents based on weight ratio: 20-40 parts of inorganic particle, 0.2-0.6 part of binder, 4-8 parts of organic particle having swelling property, 0.4-0.8 part of plasticizer and 60-66 parts of solvent. Compared with the prior art, the novel dual-layer electrode material is adopted, an inorganic and organic protection layer is additionally arranged on the basis of the traditional electrode material, the mechanical strength and thermal stability of the battery are improved, a positive electrode and a negative electrode can be prevented from being contacted in an extreme condition, and thus, a combustion phenomenon is avoided. Compared with the a diaphragm technology applying the organic and inorganic layers, the purpose of using the dual-layer electrode can be achieved only by applying a layer to one end of the positive electrode, the coating process is simplified, and the cost is saved.

Description

Technical field [0001] The invention relates to a lithium ion battery positive electrode sheet, a preparation method and application thereof, and belongs to the technical field of new battery materials. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, and other mobile phones because of their high mass energy density and volumetric energy density, high working voltage, wide operating temperature, long service life, and environmental friendliness. Kind of electric vehicles, even aerospace, wind and solar energy storage equipment. However, lithium-ion batteries have certain safety hazards when they are used, especially when they are exposed to high temperatures and sharp objects, they will burn violently, which will bring great harm in the field of power batteries. In order to solve this problem, it is necessary to provide a polymer lithium ion battery with higher safety performance and mechanical performance to improve the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M4/04H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/62H01M10/0525Y02E60/10
Inventor 陶泽天侯贵华张勤芳岳鹿曹月斌
Owner YANCHENG INST OF TECH
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