A kind of conductive composite material and its preparation method and application in lithium ion battery electrode

A technology of conductive composite materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve battery safety performance and cycle performance deterioration, increased lithium ion transmission paths, and pole piece pores 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: 2022-08-05
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of conductive composite material and its preparation method and application in lithium ion battery electrode
  • A kind of conductive composite material and its preparation method and application in lithium ion battery electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of a conductive composite material is provided, which specifically comprises the following steps:

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

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

[0046] Step 3. A...

Embodiment 2

[0049] A preparation method of a conductive composite material is provided, which specifically comprises the following steps:

[0050] Step 1: Add polystyrene and conductive material carbon nanotubes to the organic solvent dimethylfuran, heat and stir at 60°C for 3 hours, and prepare an electrospinning solution A with a concentration of polystyrene and conductive material of 10%. The mass ratio of polystyrene is 0.2:1. Electrospinning solution A was carried out by electrospinning equipment with a voltage of 20 kV, a spinning rate of 60 mL / min, and an electrode distance of 20 cm to obtain nanofibers with a diameter of 734 nm.

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

[0052] In step 3, hydrogen peroxide is added to the mixed liquid B obtained in step 2, and the mass ratio of pyrrole to hydrog...

Embodiment 3

[0055] A preparation method of a conductive composite material is provided, which specifically comprises the following steps:

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

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

[0058] In step 3, ferric chloride is added to the mixed liquid B obtained i...

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Abstract

The invention discloses a conductive composite material, a preparation method thereof and an application in a lithium ion battery electrode. The composite material includes a hollow conductive polymer tube and a conductive material, the conductive material is uniformly dispersed inside the conductive polymer tube in an incomplete filling manner, and the inner diameter of the conductive polymer tube is 100-4000 nm. Its preparation: electrospinning an electrospinning solution containing a high molecular polymer and a conductive material to obtain nanofibers, then dispersing into a hydrochloric acid solution containing a conductive polymer monomer, adding an initiator to carry out a polymerization reaction, and obtaining a surface coating The nanofibers coated with the conductive polymer are finally added into an organic solvent to fully dissolve the high molecular polymers in the nanofibers, so as to obtain a conductive composite material. The conductive composite material has good electrical conductivity and ion-conducting properties at the same time. When used as a conductive agent in electrodes, it can effectively eliminate the polarization phenomenon under high current charge and discharge conditions, relieve battery swelling, and improve rate performance and cycle performance.

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 a lithium ion battery electrode. Background technique [0002] Lithium-ion battery is a high-capacity, long-life, environmentally friendly battery with many advantages, such as high voltage, large 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 popularization of charging piles, especially compared with fuel vehicles, the charging speed of charging piles is far less than that of consumers. Therefore, the requirements for the rate performance of lithium-ion batteries are getting higher and higher. [0003] At present, comme...

Claims

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Application Information

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Patent Type & Authority Patents(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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