Dual-layer structure positive electrode plate and fabrication method and application thereof

A technology of positive electrode sheet and double-layer structure, which is applied in the direction of electrode manufacturing, structural parts, electrode rolling/calendering, etc., can solve the problems of poor electrolyte wettability, unsatisfactory, poor electrical conductivity, etc., and achieve good electrochemical performance, Good compatibility and the effect of improving wettability

Inactive Publication Date: 2019-04-02
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the positive electrode sheet of the lithium ion battery, the wettability of the electrolyte is poor, and the electrical conductivity is poor, which cannot meet the requirements of the positive electrode sheet of the lithium ion battery

Method used

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  • Dual-layer structure positive electrode plate and fabrication method and application thereof
  • Dual-layer structure positive electrode plate and fabrication method and application thereof
  • Dual-layer structure positive electrode plate and fabrication method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A method for preparing a double-layer structure positive pole piece comprises the steps of:

[0065] (1) Mix nickel-cobalt lithium aluminate, carbon black, and polyvinylidene fluoride in a mass ratio of 97:1:2 to prepare a mixture, and then mix the mixture with N-methylpyrrolidone in a mass ratio of 3:1, Prepare electrode slurry;

[0066] (2) Coating the electrode slurry on both sides of the current collector with an area density of 30 mg / cm 2 The first coating layer, the first coating layer is rolled once, the thickness of the first coating layer is 83 μm, and then the electrode slurry is coated on the first coating layer after rolling with an area density of 30mg / cm 2 The second coating layer is finally rolled twice, the second coating thickness is 102 μm, and the porosity of the first electrode material layer is 18.0%, and the porosity of the second electrode material layer is 33.0%. Structural positive pole piece.

Embodiment 2

[0068] The difference with Example 1 is that the areal density of the first coating layer in step (2) is 30mg / cm 2 , the thickness of the first coating layer is 80 μm, and the porosity of the first electrode material layer in the double-layer structure positive electrode sheet is 15%.

Embodiment 3

[0070] The difference with Example 1 is that the areal density of the first coating layer in step (2) is 30mg / cm 2 , the thickness of the first coating layer is 87 μm, and the porosity of the first electrode material layer in the double-layer structure positive electrode sheet is 22%.

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Abstract

The invention relates to a dual-layer structure positive electrode plate. The positive electrode plate comprises a current collector and positive active units, wherein the positive active units are arranged at two sides of the current collector, each positive active unit comprises first electrode material layers and second electrode material layers, the first electrode material layers are arrangedat two sides of the current collector, the second electrode material layers are arranged on surfaces of the first electrode material layers, the porosity of the first electrode material layer is 15-22%, and the porosity of the second electrode material layer is 25-50%. With the adoption of the dual-layer porous structure of which the porosity in the positive active units is gradually increased, the porosity of the second electrode material layer is larger than the porosity of the first electrode material layer, the wettability of an electrolyte in the positive electrode material, lithium ioneffective diffusion coefficient and the utilization rate of a positive active substance are improved, and the actual-volatizing gram capacity of the positive electrode material is further improved.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a double-layer positive pole piece, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in energy storage and electric vehicles. With the rapid development of industrial technology, various application fields, especially the development of electric vehicles, put forward higher requirements for lithium-ion batteries. In order to ensure good safety, In the case of cycle life and rate performance, it is an inevitable trend for future development to continuously improve the energy density of lithium-ion batteries and develop high-energy lithium-ion batteries. [0003] At present, all countries in the world are increasing investment in research on lithium-ion batteries, and are conducting research on various aspects of batteries, with the purpose of improving the energy density, power density, safety and life of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/04H01M10/0525
CPCH01M4/0404H01M4/0435H01M4/131H01M4/136H01M4/1391H01M4/1397H01M10/0525H01M2220/20Y02E60/10
Inventor 巫湘坤张锁江宋开放张兰陈占
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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