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Conductive aqueous binder applied to lithium ion battery and preparation method and application thereof

A technology of lithium-ion batteries and water-based binders, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of not being able to reduce the internal resistance of pole pieces, short service life of binders, and affecting battery performance, and achieve enhanced Effects of improving mechanical properties, improving cohesive force, and improving dispersion effect

Active Publication Date: 2020-01-14
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the binder has a short service life and high production costs, so it has not yet been used on a large scale.
CN106866846A discloses a water-based binder, which can strengthen the polymer and current collector by modifying the hydroxyl group in the repeating unit group of the water-soluble polymer to achieve the introduction of flexible side chain polar groups containing polar anionic groups The polarity effect, thereby improving the bonding force, in addition to improving the flexibility of the polymer, so that the battery pole piece with good flexibility can be made, and the electrode pole piece can have a high initial Coulombic efficiency, but this binder Can not reduce the internal resistance of the pole piece, thus affecting the performance of the battery

Method used

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  • Conductive aqueous binder applied to lithium ion battery and preparation method and application thereof
  • Conductive aqueous binder applied to lithium ion battery and preparation method and application thereof
  • Conductive aqueous binder applied to lithium ion battery and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0097] The conductive aqueous binder for lithium ion batteries provided in this embodiment has a three-dimensional conductive grid structure, and the structure is shown in formula II.

[0098] The preparation method is as follows:

[0099] (1) 10g of lithium silicate and 50g of acrylamide are dissolved in water to obtain an aqueous solution with a mass fraction of lithium silicate of 5%, and the aqueous solution is added dropwise to 80g of polyvinyl alcohol (the molar number of the repeating unit M is 1.82mol), Stir at 30°C for 10 hours to obtain a water-soluble polymer represented by formula I.

[0100] (2) the water-soluble polymer 57g that step (1) obtains, 13.7g silver particle (being 5% of binding agent quality) and methacrylic acid are under the triggering of 4g ammonium persulfate, polymerized 20 hours at 0 ℃, A conductive aqueous binder for lithium ion batteries is obtained.

Embodiment 2

[0102] The conductive aqueous binder for lithium ion batteries provided in this embodiment has a three-dimensional conductive grid structure, and the structure is shown in formula II.

[0103] (1) 10g lithium silicate, 6g acrylamide and 5g propylene oxide are dissolved in water, obtain lithium silicate mass fraction and be the aqueous solution of 20%, the aqueous solution is added dropwise to 80g polyvinyl alcohol (the number of moles of repeating unit M is 1.82mol), stirred at 90°C for 0.5 hour to obtain the water-soluble polymer represented by formula I.

[0104] (2) the water-soluble polymer 141g that step (1) obtains, 137g conductive polymer (being 50% of binding agent quality) and methacrylic acid are under the initiation of 4g ammonium persulfate, polymerized 1 hour at 100 ℃, A conductive aqueous binder for lithium ion batteries is obtained.

Embodiment 3

[0106] The conductive aqueous binder for lithium ion batteries provided in this embodiment has a three-dimensional conductive grid structure, and the structure is shown in formula II.

[0107] (1) 10g lithium silicate, 0.01g acrylamide and 0.01g propylene oxide are dissolved in water, obtain lithium silicate mass fraction and be the aqueous solution of 90%, the aqueous solution is added dropwise to 80g polyvinyl alcohol (the mole of repeating unit M number is 1.82mol), stirred at 60°C for 4 hours to obtain a water-soluble polymer represented by formula I.

[0108] (2) 7g of the water-soluble polymer obtained in step (1), 78g of silver particles (5% of the mass of the binder) and acrylic acid were polymerized at 50°C for 10 hours under the initiation of 0.004g of ammonium persulfate to obtain lithium Conductive aqueous binder for ion batteries.

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Abstract

The invention provides a conductive aqueous binder applied to a lithium ion battery and a preparation method and application thereof. The binder is in a three-dimensional grid structure formed by polymerizing conductive particles, water-soluble monomers, and water-soluble polymers. The binder provided by the invention comprises a water-soluble monomer. The water-soluble monomer can provide water solubility and adhesion and forms the three-dimensional grid structure with conductive particles and water-soluble polymers. The conductivity, water solubility, and mechanical properties of the binderprovided by the invention are further enhanced. The binder provided by the invention is safe, environmentally friendly, and low in cost, and is suitable for manufacturing positive and negative electrode pieces of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and relates to a conductive water-based adhesive for lithium-ion batteries and a preparation method and application thereof. Background technique [0002] Today, lithium-ion batteries have been widely used in products such as mobile phones, computers and electric vehicles, and have great commercial value. At present, the cathode materials of commercial lithium-ion batteries are based on oxides such as LiCoO 2 , LiMn 2 o 4 and LiFePO 4 etc.; the negative electrode material is mainly graphite. Due to the low theoretical capacity of graphite (372mAh / g), it is difficult to meet the needs of the rapid development of today's electronic information and energy technologies. Therefore, high-capacity silicon-based materials (theoretical capacity 4200mAh / g) have been developed. g) It has become a major issue in the development of lithium-ion battery technology. However, because silicon-base...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M4/624H01M10/0525Y02E60/10
Inventor 刘俊王伟华任建国黄友元岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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