Preparation method of copolymerized PVDF resin for lithium battery binder

A copolymerization, lithium battery technology, used in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of high dispersion requirements for resin slurry configuration and high rotational viscosity of NMP solution, reduce the requirements for configuration dispersion, and avoid shrinkage. and swelling effects, the effect of optimizing the aggregation method

Active Publication Date: 2021-01-01
ZHEJIANG QUZHOU JUSU CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the rotational viscosity of NMP solution is higher
The disadvantage is that there are technical problems such as high requirements for the configuration and dispersion of resin slurry

Method used

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  • Preparation method of copolymerized PVDF resin for lithium battery binder
  • Preparation method of copolymerized PVDF resin for lithium battery binder
  • Preparation method of copolymerized PVDF resin for lithium battery binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of copolymerized PVDF resin for lithium battery binder, comprising the following steps:

[0038] (1) Preparation of metallocene synergist: 0.01kg of 4'-phenyl-2,2':6',2"-terpyridine, 0.1kg of cobalt isooctanoate, 10kg of vinylpyrrolidone, 0.3 kg vinylferrocene, 100kg dimethylhydrosilyl chloride were added to the reaction kettle for hydrosilylation, the reaction temperature was 25°C, and the reaction time was 3h to obtain 66.2kg of metallocene synergist, 0.3kg was taken for later use;

[0039] (2) Prepare the reaction raw materials for subsequent use: by every kg, the reaction raw materials are composed of:

[0040] Deionized water 300kg

[0041] pH buffer regulator: disodium dihydrogen pyrophosphate 0.04kg

[0042] Vinylidene fluoride (VDF) monomer 85kg

[0043] Comonomer:

[0044]

[0045] (3) Prepare pH buffer regulator aqueous solution and dispersant aqueous solution: pH buffer regulator disodium dihydrogen pyrophosphate 0.04kg and 15kg de...

Embodiment 2

[0050] A preparation method of copolymerized PVDF resin for lithium battery binder, comprising the following steps:

[0051] (1) Preparation of metallocene synergist: 0.05kg of 4'-phenyl-2,2':6',2"-terpyridine, 0.2kg of cobalt isooctanoate, 19kg of vinylpyrrolidone, 0.7kg per 1kg Add kg vinyl ferrocene and 122kg dimethylhydrosilyl chloride into the reaction kettle for hydrosilylation reaction. The reaction temperature is 28°C and the reaction time is 2h to obtain 71.8kg of metallocene synergist. Take 0.9kg for use ;

[0052] (2) Prepare the reaction raw materials for subsequent use: according to each 1kg, the reaction raw materials consist of

[0053] Deionized water 500kg

[0054] pH buffer regulator: disodium hydrogen phosphate 0.11kg

[0055] Vinylidene fluoride (VDF) monomer 88kg

[0056] Comonomer:

[0057]

[0058] (3) prepare pH buffer regulator aqueous solution and dispersant aqueous solution: the deionized water of pH buffer regulator disodium phosphate 0.11kg...

Embodiment 3

[0063] A preparation method of copolymerized PVDF resin for lithium battery binder, comprising the following steps:

[0064] (1) Preparation of metallocene synergist: 0.5kg of 4'-phenyl-2,2':6',2"-terpyridine, 1kg of cobalt isooctanoate, 25kg of vinylpyrrolidone, 2kg of ethylene Based on ferrocene, 150kg of dimethylhydrosilyl chloride was added into the reaction kettle, a hydrosilylation reaction occurred, the temperature was 40°C, the reaction time was 5h, and 95kg of metallocene synergist was obtained, and 3kg was taken for later use;

[0065] (2) Prepare the reaction raw materials for subsequent use: according to each 1kg, the reaction raw materials are composed of:

[0066] Deionized water 600kg

[0067] pH buffer regulator: sodium pyrophosphate 0.25kg

[0068] Vinylidene fluoride (VDF) monomer 99.5kg

[0069] Comonomer:

[0070] Acrylic 5kg

[0071] Methacrylic acid 10kg

[0072] Initiator:

[0073]

[0074] (3) Preparation of pH buffer regulator aqueous solutio...

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Abstract

The invention discloses a preparation method of copolymerized PVDF resin for a lithium battery binder. The preparation method comprises the following steps: reacting 300-600 parts of deionized water,0.04-0.25 part of a pH buffer regulator, 85-99.5 parts of a vinylidene fluoride (VDF) monomer, 0.5-15 parts of a comonomer, 0.3-3 parts of a metallocene synergist, 0.2-1.0 part of an initiator and 0.08-0.35 part of a dispersing agent at 40-65 DEG C under 5.5-8.0 Mpa, recovering unreacted monomers after the reaction is finished, washing, filtering and drying to obtain the copolymerized PVDF resin.According to the copolymerized PVDF resin for the lithium battery binder, the bonding performance of the PVDF resin to a positive electrode active substance and a current collector is improved, the rotary viscosity of an NMP solution is reduced, and meanwhile, the preparation and dispersion requirements on PVDF resin slurry are reduced.

Description

technical field [0001] The invention relates to a preparation method of PVDF resin, in particular to a preparation method of copolymerized PVDF resin for lithium battery binder. Background technique [0002] Polyvinylidene fluoride (PVDF) resin is mainly used in anode (positive electrode) binders in lithium battery applications. In terms of specific application formulas, PVDF and NMP are made into slurry, and positive electrode active materials (LFP, lithium manganese oxide, cobalt acid Lithium), conductive agent (SUPER_P conductive carbon black), and then coated on the current collector to make lithium battery cathode material. [0003] At present, in the lithium battery market, especially in power batteries, grafted PVDF resins are mainly used, such as Solvay 5130, 5140 and other PVDF resins. The polymer is usually dissolved in a solvent with a very high boiling point (202°C) (N -Methylpyrrolidone, NMP). Although this polymer is very effective as a binder and is electroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F214/06C08F220/18C08F220/14C08F220/06C08F220/44C08F2/44C08F2/20C08J3/24H01M4/62H01M10/052C08L27/16
CPCC08F214/225C08F2/44C08F2/20C08J3/24H01M4/623H01M10/052C08F214/06C08F220/1808C08F220/14C08F220/1804C08F220/06C08F220/44C08J2327/16Y02E60/10
Inventor 韩金铭吴志刚吴宇鹏马从礼王金明苏兰辉王正良赵鑫犇
Owner ZHEJIANG QUZHOU JUSU CHEM IND CO LTD
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