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Polyurethane binder, preparation method thereof and positive electrode of lithium battery

A polyurethane and binder technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems affecting battery life and safety performance, unsatisfactory mechanical properties and elasticity, poor electronic and ion conductivity, etc., to achieve Excellent mechanical properties, improved lithium ion migration number, good electronic and ion conductivity effects

Pending Publication Date: 2022-05-13
广东粤港澳大湾区黄埔材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] PVDF has become the most common lithium-ion battery binder because of its excellent electrochemical stability and thermal stability, but it has the following shortcomings: (1) poor electronic and ionic conductivity; (2) easily dissolved by the electrolyte, resulting in The adhesion of the active material on the current collector becomes poor; (3) the mechanical properties and elasticity are not ideal; (4) it is easy to form lithium carbide with metal lithium, which affects the service life and safety performance of the battery; (5) the environment is harmful to the environment during storage and use high humidity requirements

Method used

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  • Polyurethane binder, preparation method thereof and positive electrode of lithium battery
  • Polyurethane binder, preparation method thereof and positive electrode of lithium battery
  • Polyurethane binder, preparation method thereof and positive electrode of lithium battery

Examples

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Effect test

Embodiment 1

[0041] The polyurethane adhesive of the present embodiment is prepared from the following raw materials in parts by weight: 82 parts of isocyanate, 200 parts of PTMEG, 10 parts of the first chain extender, 16 parts of the second chain extender, 15 parts of lithium salt and 390 parts of solvent , wherein, the isocyanate is IPDI; PTMEG polyol molecular weight 1000, purchased from BASF; catalyst is dibutyltin dilaurate; the first chain extender is MOCA; the second chain extender is BDO, the solvent is NMP, and the lithium salt is LITFSI.

[0042] The preparation method of the polyurethane binder of the present embodiment may further comprise the steps:

[0043] (1) Under the protection of nitrogen, put 200 parts of PTMEG, 10 parts of the first chain extender, and 16 parts of the second chain extender, and remove water under vacuum for 4 hours at 110°C and 800 rpm.

[0044] (2) The temperature is reduced to 80 degrees, and 390 parts of solvent are added to the material obtained in...

Embodiment 2

[0055] The polyurethane adhesive of this embodiment is prepared from the following raw materials in parts by weight: 120 parts of isocyanate, 200 parts of PTMEG, 20 parts of the first chain extender, 24 parts of the second chain extender, 15 parts of lithium salt, 520 parts of solvent , wherein, the isocyanate is IPDI; PTMEG polyol molecular weight 1000, purchased from BASF; catalyst is dibutyltin dilaurate; the first chain extender is MOCA; the second chain extender is BDO, the solvent is NMP, and the lithium salt is LITFSI.

[0056] (1) The preparation method of the present embodiment polyurethane adhesive comprises the following steps:

[0057] Under the protection of nitrogen, 200 parts of PTMEG, 20 parts of the first chain extender, and 24 parts of the second chain extender were put in, and water was removed under vacuum for 4 hours at 110° C. at a speed of 800 rpm.

[0058] (2) The temperature is reduced to 80 degrees, and 520 parts of solvent are added to the material obt...

Embodiment 3

[0066] The polyurethane adhesive of the present embodiment is prepared from the following raw materials in parts by weight: 160 parts of isocyanate, 200 parts of PTMEG, 30 parts of the first chain extender, 32 parts of the second chain extender, 15 parts of lithium salt and 650 parts of solvent , wherein, the isocyanate is IPDI; PTMEG polyol molecular weight 1000, purchased from BASF; catalyst is dibutyltin dilaurate; the first chain extender is MOCA; the second chain extender is BDO, the solvent is NMP, and the lithium salt is LITFSI.

[0067] The preparation method of the polyurethane binder of the present embodiment may further comprise the steps:

[0068] (1) Under the protection of nitrogen, put in 120 parts of PTMEG, 30 parts of the first chain extender, and 32 parts of the second chain extender, and remove water under vacuum for 4 hours at 110°C and 800 rpm.

[0069] (2) The temperature is reduced to 80 degrees, and 650 parts of solvent are added to the material obtaine...

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Abstract

The invention discloses a polyurethane binder which comprises the following components in parts by weight: 100-200 parts of isocyanate; 200 to 300 parts of PTMEG (polytetramethylene ether glycol); 10 to 20 parts of a catalyst; 5 to 50 parts of MOCA; 5 to 50 parts of BDO; 15 to 30 parts of lithium salt; and 300 to 800 parts of a solvent. The invention also discloses a preparation method of the polyurethane binder and a lithium battery positive electrode prepared from the polyurethane binder. According to the invention, the electron and ion conductivity is improved, and the service life of the lithium battery is prolonged; and the used raw materials are easily available, the synthesis operation is simple, and the method is suitable for industrial production application.

Description

technical field [0001] The invention relates to the field of binders for lithium batteries, in particular to a polyurethane binder, a preparation method thereof, and a positive electrode of a lithium battery. Background technique [0002] The binder is a key component in the preparation of the positive electrode of a lithium battery. The active material and the conductive agent are firmly adhered to the current collector through the binder to prevent it from falling off, maintain the integrity and structural stability of the electrode, and enhance the stability of the electrode sheet. Mechanical stability and availability of active substances. [0003] PVDF has become the most common lithium-ion battery binder because of its excellent electrochemical stability and thermal stability, but it has the following shortcomings: (1) poor electronic and ionic conductivity; (2) easily dissolved by the electrolyte, resulting in The adhesion of the active material on the current collec...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/136H01M10/0525
CPCH01M4/622H01M4/625H01M4/136H01M10/0525H01M2004/028Y02E60/10
Inventor 萧景驰张淑雅崔庆实黄泽熹王杰袁黎光杨小牛
Owner 广东粤港澳大湾区黄埔材料研究院