A double-sided coating integrated three-dimensional substrate manufacturing method and manufacturing equipment

A technology for manufacturing equipment and substrates, applied in electrode manufacturing, electrode rolling/calendering, electrode collector coating, etc., which can solve the problems of difficult control of coating uniformity and coating thickness, uneven distribution of conductive paste, Affect the passage of conductive ions, etc., to improve injection efficiency and moisture drying efficiency, reduce defect generation, and ensure the effect of bonding area

Active Publication Date: 2021-07-09
长沙锂安能电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the hole is filled with conductive paste, which affects the passage of conductive ions.
In addition, the conductivity of the conductive paste is limited. In order to ensure the performance of the battery, the coating thickness is usually limited, generally a few microns. This method is difficult to control the coating uniformity and coating thickness. It is difficult to form an H-shaped structure, and the conductive paste in the pores is unevenly distributed, which affects the performance of the battery. If the pore size is too small, the conductive paste may be erected at the upper and lower openings of the micropores, and it is difficult to penetrate into the pores, which will increase the size of the battery. Internal resistance

Method used

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  • A double-sided coating integrated three-dimensional substrate manufacturing method and manufacturing equipment
  • A double-sided coating integrated three-dimensional substrate manufacturing method and manufacturing equipment
  • A double-sided coating integrated three-dimensional substrate manufacturing method and manufacturing equipment

Examples

Experimental program
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Effect test

example 1

[0070] The positive electrode aluminum foil has a thickness of 12 μm, and a CNT conductive layer with a diameter of 6 to 10 nm and a length of 500 nm is pre-coated on both sides, and a thickness of 1 μm is pre-coated on one side. The thickness of the negative electrode copper foil is 8 μm, and the material and thickness of the conductive layer pre-coated on both sides of the copper foil are the same as those of the positive electrode.

[0071] The burr micro-holes are rolled on both sides of the pre-coated foil, with a pore size of 30-40 μm and a pore density of 50 pcs / mm 2 , the porosity is 5%, and the burr height on one side is 50μm. Then, the active material is coated on the surface of the pre-coated foil with micropores by extrusion coating, and then dried, rolled, slit, and die-cut to make positive and negative electrodes.

[0072] Among them, the positive electrode active material is lithium iron phosphate, accounting for 90-95%, the binder uses PVDF, accounting for 2-5...

example 2

[0074] Based on Example 1, the difference is that the positive and negative micropores are all burr-free micropores (i.e., plane holes), and the pore diameter, pore density and porosity are the same as in Example 1.

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Abstract

The invention discloses a double-sided coating integrated three-dimensional substrate manufacturing method and manufacturing equipment. The method includes: pre-coating a conductive layer on both sides of the substrate; The pores are coated with active material layers on both sides of the substrate, so that the active material layers are located on the conductive layer and filled in the micropores and connected as a whole. This method can increase the coating amount of the active material and the bonding area between it and the substrate, reduce the occurrence of micropore processing defects, ensure the internal structure of the three-dimensional substrate and the consistency of the coating, and at the same time, the moisture, electrolyte, and active material Components such as conductive ions can more efficiently realize three-dimensional intercommunication through micropores, improving battery safety, production efficiency, charge-discharge rate and cycle life.

Description

technical field [0001] The invention relates to the technical fields of coil coating, processing and batteries, in particular to a double-sided coating integrated three-dimensional substrate manufacturing method and manufacturing equipment. Background technique [0002] With the popularization of electronic equipment and electric vehicles, secondary batteries are widely used. In traditional secondary batteries, active materials are mostly coated on the surface of two-dimensional metal foils to make electrodes. In order to improve the adhesion between metal foils and active materials, adhesives need to be added, which affects the energy density and cycle of the battery. Life, and this non-porous electrode, moisture drying and electrolyte diffusion consistency is limited. [0003] Setting through holes on the metal foil is considered to be a method to improve the electrical performance of the electrode. As disclosed in the Chinese patent with the publication number CN10787187...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/66H01M4/13
CPCH01M4/0404H01M4/0435H01M4/13H01M4/667Y02E60/10
Inventor 吴达红
Owner 长沙锂安能电子科技有限公司
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