Adhesive for negative pole material of lithium ion battery and preparation method of electrode containing adhesive

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of first efficiency reduction, cycle and rate performance deterioration, etc.

Active Publication Date: 2013-11-20
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the objectives of the present invention is to provide an adhesive for lithium-ion battery negative electrode materials in view of the deficiencies in the prior art. problems such as reduction, poor cycle and rate performance

Method used

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  • Adhesive for negative pole material of lithium ion battery and preparation method of electrode containing adhesive
  • Adhesive for negative pole material of lithium ion battery and preparation method of electrode containing adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, A binder for negative electrode materials of lithium ion batteries, which is a polyacrylic acid polymer, which is formed by condensation of polyacrylic acid and polyether polymers, wherein polyacrylic acid accounts for the polyacrylic acid polymer The percentage by weight of the total weight of the product is 10%, and the molecular weight of the polyether polymer is 100. Polyether polymers include: 1 mol% of repeating units derived from monomers represented by structural formula (I),

[0023] (I)

[0024] and 99 mol% of repeating units derived from monomers represented by structural formula (II);

[0025] (II)

[0026] Wherein, X is a methyl group.

Embodiment 2

[0027] Example 2, A binder for negative electrode materials of lithium ion batteries, which is a polyacrylic acid polymer, which is formed by condensation of polyacrylic acid and polyether polymers, wherein polyacrylic acid accounts for the polyacrylic acid polymer The percentage by weight of the total weight of the product is 15%, and the molecular weight of the polyether polymer is 200. Polyether polymers include: 10mol% of repeating units derived from monomers represented by structural formula (I),

[0028] (I)

[0029] and 90 mol% of repeating units derived from monomers represented by structural formula (II);

[0030] (Ⅱ)

[0031] Wherein, X is an ethyl group.

Embodiment 3

[0032] Example 3, A binder for negative electrode materials of lithium ion batteries, which is a polyacrylic acid polymer, which is formed by condensation of polyacrylic acid and polyether polymers, wherein polyacrylic acid accounts for the polyacrylic acid polymer The percentage by weight of the total weight of the product is 20%, and the molecular weight of the polyether polymer is 400. Polyether polymers include: 25mol% of repeating units derived from monomers represented by structural formula (I),

[0033] (I)

[0034] and 75 mol% of repeating units derived from monomers represented by structural formula (II);

[0035] (Ⅱ)

[0036] Wherein, X is a propyl group.

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to an adhesive for a negative pole material of a lithium ion battery. The adhesive is a polyacrylic acid type polymer, and the polyacrylic acid type polymer is formed by condensation of polyacrylic acid and a polyether type high molecular polymer, wherein the polyacrylic acid accounts for 10-30% by weight of the total weight of the polyacrylic acid type polymer. The adhesive disclosed by the invention adopts the water-soluble polyether type polymer with high lithium ion conductivity to modify carboxylic acid groups in the polyacrylic acid. Therefore, the obtained novel polyacrylic acid type polymer after modification can be used as the adhesive for the negative pole material of the lithium ion battery, the first charge-discharge efficiency of the battery can be effectively improved, and the high-temperature circulation performance, high-temperature storage performance, charge-discharge rate and low-temperature rate performance of the battery are also greatly improved. In addition, the invention further discloses a preparation method of a lithium ion electrode.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a binder for negative electrode materials of lithium-ion batteries and a method for preparing an electrode containing the binder. Background technique [0002] Polyacrylic acid (PAA) has been widely used as a binder for lithium-ion secondary battery anode materials due to its excellent adhesive properties. However, due to the presence of free carboxylic acid groups, the battery consumes a large amount of lithium ions to neutralize the carboxylate groups during the initial charge and discharge process, resulting in a large irreversible capacity loss. Moreover, due to the weak thermal stability of free carboxylate, it will undergo irreversible decarboxylation reaction at high temperature, which will greatly reduce the high-temperature cycle and storage performance of the battery and cause problems such as high-temperature flatulence of the battery. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139C08F20/06C08F8/00C08G81/02
CPCY02E60/122Y02E60/10
Inventor 钟开富
Owner DONGGUAN AMPEREX TECH
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