Water-based electrode binding agent and preparation method thereof

A binder and electrode technology, used in adhesives, battery electrodes, binder types, etc., can solve the problem of not many water-based binders, and achieve fast polymerization reaction speed, high monomer conversion rate, and narrow molecular weight distribution. Effect

Active Publication Date: 2017-01-04
浙江杰特维新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are not many reports on the application of water-based binders in positive electrodes, and most of them focus on the modification and compounding of several binders, or try to use other non-electrode binders in electrodes, and few of them are bonded according to the requirements of electrodes. Binder structure design

Method used

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  • Water-based electrode binding agent and preparation method thereof
  • Water-based electrode binding agent and preparation method thereof
  • Water-based electrode binding agent and preparation method thereof

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preparation example Construction

[0025] The preparation method of water-based electrode binder butyl acrylate / styrene / methyl acrylate block copolymer latex of the present invention comprises the following steps:

[0026] (1) stirring and dissolving 0.2-0.8 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent in 30-50 parts by weight of water to form an aqueous phase, then pouring 10 parts by weight of BA into the reactor and stirring and mixing; Raise the reaction temperature to 60-80°C, keep stirring, pass nitrogen to remove oxygen for 5-30 minutes, add 0.005-0.02 parts by weight of a water-soluble initiator, and polymerize for 0.5-2 hours to obtain R-AA n1 -b-St n2-b-BA n3 -X block copolymer, R-AA n1 -b-St n2 -b-BA n3 -X block copolymers are stably dispersed in water in the form of particles to form latex;

[0027] (2) Add 1.25-5 parts by weight of St monomer to the latex obtained in step 1, and continue to react for 0.5-1 hour to obtain R-AA n1 -b-St ...

Embodiment 1

[0048] (1) 0.2 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent is stirred and dissolved in 30 parts by weight of water to form an aqueous phase, then 10 parts by weight of BA is poured into the reactor and stirred and mixed; the reaction temperature is raised To 70°C, keep stirring, pass nitrogen to remove oxygen for 20 minutes, add 0.005 parts by weight of water-soluble initiator, and polymerize for 2 hours to obtain R-AA n1 -b-St n2 -b-BA n3 -X block copolymer, R-AA n1 -b-St n2 -b-BA n3 -X block copolymers are stably dispersed in water in the form of particles to form latex;

[0049] (2) Add 5 parts by weight of St monomer to the latex obtained in step 1, and continue to react for 1 hour to obtain R-AA n1 -b-St n2 -b-BA n3 -b-St n4 -X block copolymer, R-AA n1 -b-St n2 -b-BA n3 -b-St n4 -X block copolymers are stably dispersed in water in the form of particles to form latex;

[0050] (3) Add 30 parts by weigh...

Embodiment 2

[0056] (1) 0.8 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent is stirred and dissolved in 50 parts by weight of water to form an aqueous phase, then 10 parts by weight of BA is poured into the reactor and stirred and mixed; the reaction temperature is raised To 70°C, keep stirring, pass nitrogen to remove oxygen for 20 minutes, add 0.02 parts by weight of water-soluble initiator, and polymerize for 0.5 hours to obtain R-AA n1 -b-St n2 -b-BA n3 -X block copolymer, R-AA n1 -b-St n2 -b-BA n3 -X block copolymers are stably dispersed in water in the form of particles to form latex;

[0057] (2) Add 1.25 parts by weight of St monomer to the latex obtained in step 1, and continue to react for 0.5 hours to obtain R-AA n1 -b-St n2 -b-BA n3 -b-St n4 -X block copolymer, R-AA n1 -b-St n2 -b-BAn3 -b-St n4 -X block copolymers are stably dispersed in water in the form of particles to form latex;

[0058] (3) Add 12.5 parts b...

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Abstract

The invention discloses a water-based electrode binding agent and a preparation method thereof. According to the water-based electrode binding agent, an emulsion polymerization system is adopted, and a reversible addition-fragmentation chain transfer free-radical polymerization technology is used for preparing butyl acrylate/styrene/methyl acrylate block copolymer latex which is used as the electrode binding agent. A preparation process has the advantages of energy saving and environment protection; compared with a traditional binding agent polyvinylidene fluoride, the water-based electrode binding agent has the advantages of low price, simple process, no pollution and the like; the discharge specific capacity of a used electrode in a lithium iron phosphate electrode can reach 153.4mAh/g, and the discharge specific capacity in a graphite electrode can reach 358.6mAh/g; and therefore, the water-based electrode binding agent has great application prospects.

Description

technical field [0001] The invention belongs to the field of polymer material technology and lithium ion batteries, and in particular relates to a preparation method of a water-based electrode binder. Background technique [0002] Electrode optimization is also one of the important means to improve the performance of lithium-ion batteries. The composition of the electrode includes an active material, a conductive agent and a binder, which are prepared by coating a mixed slurry of the three materials in a certain composition ratio on the current collector. Although the binder accounts for a small proportion in the electrode composition, the influence of the binder on the electrode structure cannot be ignored, and improving its binding force, elasticity, and ion conductivity has a significant effect on improving battery performance. Therefore, it is of great research significance to select and optimize the binder. [0003] Polyvinylidene fluoride PVDF is one of the most wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/00C08F285/00C08F212/08C08F220/14H01M4/62
CPCC08F285/00C08F2438/03C09J151/006H01M4/622C08F212/08C08F220/14Y02E60/10
Inventor 高翔郑哲楠罗英武张帆
Owner 浙江杰特维新材料有限公司
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