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Composite conductive agent with special structure for lithium ion battery and preparation method of battery containing the conductive agent

A composite conductive agent and lithium-ion battery technology, applied in battery electrodes, structural parts, secondary batteries, etc., can solve problems such as high addition amount and uneven dispersion of conductive agent, achieve high conductivity, reduce material cost, and easily scattered effect

Active Publication Date: 2022-04-29
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the defects of the prior art: the conductive agent is dispersed unevenly and added in a high amount during the homogenate dispersion process, and to provide a composite conductive agent with a special structure that has good conductivity, is uniformly dispersed and is not easy to agglomerate

Method used

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  • Composite conductive agent with special structure for lithium ion battery and preparation method of battery containing the conductive agent
  • Composite conductive agent with special structure for lithium ion battery and preparation method of battery containing the conductive agent
  • Composite conductive agent with special structure for lithium ion battery and preparation method of battery containing the conductive agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]1) Disperse 4g of polyacrylonitrile and 4g of Super-P into a conical flask filled with 50ml of dimethylformamide, stir for 6h to disperse evenly;

[0041] 2) Inject the uniformly dispersed mixed solution into a plastic syringe connected with a stainless steel needle, the diameter of which is 1.0mm;

[0042] 3) Adjust the injection rate of the syringe to 0.2mL / min through the precision propeller, and place a collector made of aluminum at about 15cm in the direction of the stainless steel needle to collect the prepared product, that is, a composite conductive agent with a special structure;

[0043] 4) The obtained composite conductive agent with special structure is extracted with alcohol at 80° C. for 10 minutes to infiltrate, and then the solvent is removed; and then dried to obtain the composite conductive agent with special structure.

[0044] 5) Preparation of the positive pole piece: mix the positive active material lithium cobaltate, the special structure composite...

Embodiment 2

[0048] 1) Disperse 4g of polyacrylonitrile and 4g of Ketjen Black in a conical flask filled with 50ml of dimethylformamide, stir for 6h to disperse evenly;

[0049] 2) Inject the uniformly dispersed mixed solution into a plastic syringe connected with a stainless steel needle, the diameter of which is 1.0mm;

[0050] 3) Adjust the injection rate of the syringe to 0.2mL / min through the precision propeller, and place a collector made of aluminum at about 15cm in the direction of the stainless steel needle to collect the prepared product, that is, a composite conductive agent with a special structure;

[0051] 4) The obtained composite conductive agent with special structure is extracted with alcohol at 80° C. for 10 minutes to infiltrate, and then the solvent is removed; and then dried to obtain the composite conductive agent with special structure.

[0052] 5) Preparation of the positive pole piece: mix the positive active material lithium cobaltate, the special structure compo...

Embodiment 3

[0056] 1) Disperse 4g of polyacrylonitrile and 4g of acetylene black into an Erlenmeyer flask filled with 50ml of dimethylformamide, stir for 6h to disperse evenly;

[0057] 2) Inject the uniformly dispersed mixed solution into a plastic syringe connected with a stainless steel needle, the diameter of which is 1.0mm;

[0058] 3) Adjust the injection rate of the syringe to 0.2mL / min through the precision propeller, and place a collector made of aluminum at about 15cm in the direction of the stainless steel needle to collect the prepared product, that is, a composite conductive agent with a special structure;

[0059] 4) The obtained composite conductive agent with special structure is extracted with alcohol at 80° C. for 10 minutes to infiltrate, and then the solvent is removed; and then dried to obtain the composite conductive agent with special structure.

[0060] 5) Preparation of the positive pole piece: mix the positive active material lithium cobaltate, the special struct...

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Abstract

The invention relates to a composite conductive agent with a special structure for lithium ion batteries and a preparation method for a battery containing the conductive agent. One-dimensional carbon fibers are prepared by electrospinning technology. During the preparation process, the conductive agent is embedded in it to synthesize a composite conductive agent with a special structure. agent, and then use this special structure composite conductive agent as positive or negative electrode conductive agent. The carbon fiber prepared by the present invention is an ultrafine uniaxial or multiaxial fiber material with a diameter of 3nm-5μm. The carbon fiber structure disperses the conductive agent evenly, and the conductive agent is not easy to agglomerate during the homogenization process; in addition, because there are conductive agent particles between the carbon fibers, It is not easy to agglomerate itself, and the two conductive agents support each other to form a conductive network; the slurry is well dispersed, and the electrolyte is better infiltrated. Good electrolyte infiltration can improve the activity of the active material, and provide a better transmission platform for lithium ions and The way to activate the energy of the material, thereby improving the electrochemical activity of the entire electrode material.

Description

technical field [0001] The invention relates to a composite conductive agent with a special structure for a lithium ion battery and a preparation method for a battery containing the conductive agent, belonging to the technical field of lithium ion batteries. Background technique [0002] First commercialized in 1991, lithium-ion batteries are today the most widely used portable power source due to their high energy density and stable chemistry. [0003] At present, the homogenization process of the positive and negative electrodes of commercial lithium-ion batteries is to disperse active material powder, conductive agent, and binder into a slurry, and then coat them on the surface of aluminum foil and copper foil to form positive and negative electrodes. The active material should be uniformly dispersed without agglomeration, and the conductive agent particles should also be uniformly dispersed to form an all-round conductive network, which plays a role in comprehensively im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 孔丽娟张勇张明慧徐子福
Owner 安普瑞斯(无锡)有限公司
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