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Conductive composite material, preparation method thereof and application of conductive composite material in lithium ion battery electrode

A conductive composite material and conductive polymer technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve battery safety performance and cycle performance deterioration, increase lithium ion transmission path, and pole piece porosity The reduction of the rate and other problems, to achieve the effect of good conductivity, good ion conduction ability, and good conductivity

Active Publication Date: 2021-06-15
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the design of thick electrodes to increase the energy density, the transmission path of lithium ions is constantly increasing; with the high-pressure design of the electrodes, the porosity of the pole pieces is constantly decreasing; resulting in the penetration of the electrolyte. more and more difficult
With the increase of electrode polarization during high-rate charging of the battery, lithium precipitation may occur in local areas, which will eventually lead to poor safety performance and cycle performance of the battery.

Method used

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  • Conductive composite material, preparation method thereof and application of conductive composite material in lithium ion battery electrode
  • Conductive composite material, preparation method thereof and application of conductive composite material in lithium ion battery electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing a conductive composite material is provided, specifically comprising the steps of:

[0044] Step 1. Add polymethyl methacrylate and conductive carbon black into the organic solvent N,N-dimethylformamide, heat and stir at 40°C for 6 hours, and prepare polymethyl methacrylate and conductive agent with a concentration of 5 % electrospinning solution A, wherein the mass ratio of conductive agent to polymethyl methacrylate is 0.1:1. Electrospinning equipment was used to set the voltage at 10kV, the spinning rate at 100mL / min, and the electrode distance at 30cm, and electrospin the solution A to obtain nanofibers with a diameter of 302nm.

[0045] Step 2. Add the nanofibers obtained in step 1 into the 1mol / L hydrochloric acid solution of aniline, the mass ratio of aniline and nanofibers is 0.8:1, stir at 500 rpm for 6 hours, and the nanofibers are evenly dispersed to obtain mixed liquid B ;

[0046] Step 3. Add ammonium sulfate to the mixed liquid B obt...

Embodiment 2

[0049] A method for preparing a conductive composite material is provided, specifically comprising the steps of:

[0050] Step 1, adding polystyrene and conductive agent carbon nanotubes into the organic solvent dimethyl furan, heating and stirring at 60°C for 3 hours, and preparing an electrospinning solution A with a polystyrene and conductive agent concentration of 10%, the conductive agent and The mass ratio of polystyrene is 0.2:1. Electrospinning equipment was used to set the voltage at 20kV, the spinning rate at 60mL / min, and the electrode distance at 20cm, and electrospin the solution A to obtain nanofibers with a diameter of 734nm.

[0051] Step 2, adding the nanofibers obtained in step 1 into a 1mol / L hydrochloric acid solution of pyrrole, the mass ratio of pyrrole and nanofibers is 0.9:1, stirring at 1000 rpm for 4 hours to obtain a mixed liquid B;

[0052] Step 3, add hydrogen peroxide to the mixed liquid B obtained in step 2, the mass ratio of pyrrole to hydrogen...

Embodiment 3

[0055] A method for preparing a conductive composite material is provided, specifically comprising the steps of:

[0056] Step 1, adding polyvinyl acetate and conductive agent graphene into the organic solvent N-methylpyrrolidone, heating and stirring at 100°C for 1 hour, and preparing an electrospinning solution A with a concentration of polyvinyl acetate and conductive agent of 20%, conductive The mass ratio of agent to polyvinyl acetate is 0.3:1. The electrospinning equipment was used to set the voltage at 30kV, the spinning rate at 20mL / min, and the electrode distance at 15cm, and electrospin the solution A to obtain nanofibers with a diameter of 1326nm.

[0057] Step 2, adding the nanofibers obtained in step 1 into a 1mol / L hydrochloric acid solution of thiophene, the mass ratio of thiophene and nanofibers is 1:1, stirring at 2000 rpm for 2 hours to obtain a mixed liquid B;

[0058] Step 3: Add ferric chloride to the mixed liquid B obtained in step 2, the mass ratio of t...

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Abstract

The invention discloses a conductive composite material, a preparation method thereof and application of the conductive composite material in a lithium ion battery electrode. The composite material comprises a hollow conductive polymer tube and a conductive agent, the conductive agent is uniformly dispersed in the conductive polymer tube in an incomplete filling manner, and the inner diameter of the conductive polymer tube is 100-4000 nm. The preparation method comprises the following steps: carrying out electrostatic spinning on an electrostatic spinning solution containing a high-molecular polymer and a conductive agent to obtain nanofibers, dispersing the nanofibers into a hydrochloric acid solution containing a conductive polymer monomer, adding an initiator to carry out polymerization reaction to obtain the nanofibers coated with the conductive polymer on the surface, finally adding the nanofibers into an organic solvent, and fully dissolving the high-molecular polymer in the nanofibers to obtain the conductive composite material. The conductive composite material has good conductivity and ion conductivity at the same time, and when the conductive composite material is used as a conductive agent in an electrode, the polarization phenomenon under the large-current charging and discharging condition can be effectively eliminated, battery expansion is relieved, and the rate performance and the cycle performance are improved.

Description

technical field [0001] The invention belongs to the technical field of conductive materials, and in particular relates to a conductive composite material, a preparation method thereof and an application in lithium ion battery electrodes. Background technique [0002] Lithium-ion battery is a high-capacity, long-life and environmentally friendly battery with many advantages such as high voltage, high specific energy, long cycle life, good safety performance, small self-discharge, no memory effect, fast charge and discharge, and wide operating temperature range. Widely used in energy storage, electric vehicles, portable electronic products and other fields. With the development of society and the popularity of charging piles, especially compared with fuel vehicles, the charging speed of charging piles is far behind consumers' needs. Therefore, the requirements for the rate performance of lithium-ion batteries are getting higher and higher. [0003] At present, commercialized...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/0525H01M10/42
CPCH01M4/362H01M4/602H01M4/624H01M10/4235H01M10/0525Y02E60/10
Inventor 曹余良姜倩荣赵阿龙艾新平杨汉西
Owner WUHAN UNIV
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