Lithium-ion battery negative pole piece, and preparation method and application thereof

A technology of lithium ion battery and negative electrode sheet, which is applied to battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of complicated processes, unilateral lifting of the diaphragm, and easy blocking of the pores of the diaphragm, and achieves simple process and improved air permeability. performance, improve stability

Inactive Publication Date: 2015-11-18
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 binder polyvinylidene fluoride (PVDF) are uniformly mixed at a mass ratio of 96:2.0:2.0 to make a lithium-ion battery with a certain viscosity Positive electrode slurry, the slurry is coated on the aluminum foil of the current collector, after drying at 85°C, it is cold-pressed and cut into a suitable size; then the tabs are welded to make the positive electrode sheet of the lithium-ion battery.

[0034] Preparation of negative electrode sheet:

[0035] Make slurry with graphite and conductive agent superconducting carbon (Super-P), thickener sodium carboxymethyl cellulose (CMC), and binder styrene-butadiene rubber (SBR) at a mass ratio of 96.5:1.0:1.0:1.5 , coated on the copper foil of the current collector, dried at 85°C and cut into a suitable size; welded tabs to make lithium-ion battery negative plates.

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Embodiment 2

[0043] The positive electrode sheet, negative electrode sheet, separator, non-aqueous electrolyte, and cell molding are the same as the comparative example, and only the negative electrode sheet coating is prepared in the following manner:

[0044] Add 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 to a double planetary mixer and stir for 1 hour; add 0.4 parts by mass of carboxymethyl Base cellulose, mixed at 45°C for 0.5 hours; then added 30 parts by mass of calcium carbonate (average particle size: 2 μm), and stirred at room temperature for 2 hours to obtain an organic / inorganic composite slurry.

[0045] The surface of the negative electrode sheet was coated by screen printing, and dried in a 50-degree oven after coating, and the thickness of the coating after drying was 12um.

Embodiment 3

[0047] The positive electrode sheet, negative electrode sheet, separator, non-aqueous electrolyte, and cell molding are the same as the comparative example, and only the negative electrode sheet coating is prepared in the following manner:

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

[0049] The surface of the negative electrode sheet was coated by screen printing, and dried in an oven at 50 degrees after coating, and the thickness of the coating after drying was 1um.

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Abstract

The invention discloses a lithium-ion battery negative pole piece, and a preparation method and the application thereof. The surface of the base of the negative pole piece is coated with a coating which is prepared by a composite coating material; the composite coating material mainly comprises the following components in parts by weight: 20 to 40 parts of inorganic particles, 0.2 to 0.6 part of bonding agent, 4 to 8 parts of organic particles with swelling property, 0.4 to 0.8 part of plasticizer and 60 to 66 parts of solvent. Compared with the prior art, a novel bi-layer electrode material is adopted; an inorganic-organic protective layer is added on the basis of the conventional electrode material, so that the mechanical strength and the thermal stability of the battery are improved; the contact between a negative pole and a positive pole can be avoided under extreme conditions; therefore, a combustion phenomenon is avoided. Compared with the technology of a separation membrane which adopts an organic-inorganic layer, the purpose can be achieved by only coating a layer of coating at one end of the negative pole of the bi-layer electrode; the coating process is simplified; the cost is saved.

Description

technical field [0001] The invention relates to a lithium-ion battery negative plate, 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 various A variety of electric vehicles, even aerospace, wind and solar energy storage equipment. However, there are certain safety hazards in the application of lithium-ion batteries, especially in the case of high temperature and contact with sharp objects, violent combustion will occur, 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 high safety performance and mechanical performance, so as to improve the safety performance and cycle performance of the polymer lithium-ion battery. [0003] Chinese Patent Application Publication No. CN102610773A published on July 2, 2012...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M10/0525H01M2004/027Y02E60/10
Inventor 陶泽天侯贵华张勤芳岳鹿曹月斌
Owner YANCHENG INST OF TECH
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