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Composite binder for negative electrode of silicon-based lithium-ion battery and preparation method thereof, and silicon-based lithium-ion battery

A lithium-ion battery, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inability to effectively disperse negative electrode particles and high interaction force

Active Publication Date: 2022-03-25
CALB CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, polyhydroxyl or carboxylic acid polymers usually have too high an intramolecular interaction force, resulting in a better interaction with the negative electrode active material, and cannot effectively disperse the negative electrode particles.

Method used

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  • Composite binder for negative electrode of silicon-based lithium-ion battery and preparation method thereof, and silicon-based lithium-ion battery
  • Composite binder for negative electrode of silicon-based lithium-ion battery and preparation method thereof, and silicon-based lithium-ion battery

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preparation example Construction

[0026] The method of preparing a composite binder with a silicon-based lithium ion battery negative electrode provided by the present invention includes the following steps:

[0027] Aqueous solution of aqueous polymer binder is provided; the first unsaturated ethylene monomer, the second unsaturated olefinoid monomer, and the initiator are added to the aqueous solution; the first The unsaturated olefinoid is selected from the group consisting of organic acids of the first carbon-containing carbon double bond, the organic acid salt of the first carbon-containing carbon double bond, the first carbon-containing carbon double-bonded amide, the first carbon-containing carbon double bond At least one of the second unsaturated ethylenically monomers selected from the second carbon-containing carbon double-containing amide, the second carbon-containing carbon double bond ester, the second carbon-containing carbon double bond organic acid, At least one of the organic acid salts containing...

Embodiment 1

[0048] The method for preparing a composite binder of the silicon-based lithium ion battery negative electrode, including the following steps:

[0049] 1) Add 10 g of carboxymethylcellulose and 300 g of deionized water to 500 ml of three bottles, stirred with 200 rwand / division to stir up to 80 ° C, heat insulation 2h is completely dissolved, to obtain a sodium carboxymethylcellulose sodium dispersion; The average molecular weight of the carboxymethylcellulose used is 300,000;

[0050] 2) Reduce the resulting carboxymethylcellulose sodium dispersion to 70 ° C, 8.1 g of water-soluble unsaturated ethylene monomer acrylic acid, and hydroxyethyl acrylate 13.2 g dispersion uniform (calculated sodium carboxymethylcarbonate) The molar ratio of the structural unit, acrylic acid, and hydroxyethyl acrylate is 1: 2.5: 2.5), passed into high purity nitrogen emptying oxygen for 1 h, then gradually added 30 g of aqueous solution of 0.21 g of ammonium persulfate, and then adding 4H.

[0051] A...

Embodiment 2

[0055] The method of preparing a composite binding agent for the negative electrode of the silicon-based lithium ion battery of the present embodiment, including the steps of:

[0056] 1) Add 30 g of sodium alginate and 300 g of deionized water to 500 ml of three bottles, stirred with 200 rwat / min, and heat up to 80 ° C, heat insulation 2h is completely dissolved, to obtain sodium alginate dispersion; sodium alginate The average molecular weight is 50,000;

[0057] 2) Reduce the resulting alginate dispersion to reduce temperature to 70 ° C, add water-soluble monomer unsaturated ethylenically acrylic acid 5.5 g and hydroxyethyl acrylate 8.96g dispersion (calculated structural unit, acrylic acid, acrylic acid) The molar ratio of hydroxyethyl acrylate is 2: 1: 1), which is introduced into high purity nitrogen emptying oxygen for 1 h, and then adding 30 g of aqueous solution containing 0.21 g of ammonium persulfate, 4H drop;

[0058] As the initiator is added, the polymerization rea...

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Abstract

The invention relates to a composite binder for negative electrodes of silicon-based lithium ion batteries, a preparation method thereof and a silicon-based lithium ion battery, belonging to the technical field of lithium ion batteries. The preparation method of the present invention comprises providing an aqueous solution of a water-soluble polymer binder; adding a first unsaturated ethylenic monomer, a second unsaturated ethylenic monomer and an initiator to the aqueous solution for in-situ polymerization, That is, the first and second unsaturated ethylenic monomers are independently selected from at least one of amides, esters, organic acids, and organic acid salts containing carbon-carbon double bonds. The unsaturated ethylenic monomer used in the preparation method of the present invention contains a dispersing group, and through multi-monomer copolymerization, its dispersibility to the silicon-based negative electrode material and its ability to combine with the water-soluble polymer binder can be regulated. The compatibility of the silicon-based negative electrode material can improve the dispersion and uniformity of the negative electrode slurry, and the capacity and consistency of the battery can be improved.

Description

Technical field [0001] The present invention relates to a composite binder for a silicon-based lithium ion battery and a preparation method thereof, a silicon-based lithium ion battery, belonging to a lithium ion battery technology. Background technique [0002] In recent years, in the face of longer-resumed electric vehicles, portable electronic products, aerospace and high-end military equipment, higher requirements, high-capacity, low-cost lithium-ion batteries have become the hotspots of R & D. Among them, positive and negative electrode materials with high-specific capacity are key factors in improving energy density of lithium ion batteries. At present, for the negative electrode material, traditional graphite has only 372 mAh / g of only 372 mAh / g, and the high energy density of lithium ion batteries cannot be realized. Compared to graphite carbon-based materials, silicon is not only in the crust in the crust, but also its theoretical capacity is the highest in the negat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 戴静闻王志敏怀永建王海文吉星
Owner CALB CO LTD
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