Lithium ion battery negative electrode aqueous adhesive and preparation method thereof

A technology of lithium-ion batteries and water-based binders, applied in battery electrodes, binder types, ester copolymer binders, etc., can solve problems such as environmental pollution, large amount of negative electrode binder usage, and high negative electrode production costs , to reduce production costs, increase energy density, and improve production efficiency

Active Publication Date: 2017-11-07
SICHUAN INDIGO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The binder that uses fluorine-containing olefin polymer solution as the negative electrode material of lithium-ion batteries has two obvious disadvantages: 1. The volatilization of the solvent in the electrode production process is easy to pollute the environment and have a greater impact on the health of the operators. Great harm; 2. The solvent price of fluorine-containing olefin polymer is high and the consumption is large, but special refrigeration equipment is needed to recover the solvent and process it, resulting in high production cost of the negative electrode
However, there are following disadvantages in use: 1. Negative electrode coating and drying need to be carried out at a lower temperature, resulting in low production efficiency of the pole piece, which cannot meet the high-efficiency negative pole production requirements; The pole piece is easy to break during the production process, and the edge is easy to drop when cutting the piece, which cannot meet the high-efficiency battery winding production process requirements; 3. LA132 adhesive is a resin material with a high glass transition temperature (Tg). The battery is prone to warping during the battery formation process, resulting in battery waste, reducing the yield of battery production, and increasing battery production costs
So far, the amount of negative electrode binder used is still relatively large, and the adhesiveness of the binder needs to be further improved

Method used

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  • Lithium ion battery negative electrode aqueous adhesive and preparation method thereof
  • Lithium ion battery negative electrode aqueous adhesive and preparation method thereof
  • Lithium ion battery negative electrode aqueous adhesive and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Add 400g of distilled water and 1.5g of sodium dodecylbenzenesulfonate emulsifier to a four-port reaction vessel with condensed water, set the temperature of the reaction vessel at 72°C, and pass nitrogen to remove oxygen for 30 minutes while stirring. After the internal temperature of the reactor reached the set temperature, 1.5g of potassium persulfate was added at one time, and 200 grams of concentration was added dropwise at the same time as 12% 2-acrylamido-2-methylpropanesulfonate (Amps) aqueous solution to mix with 230g of butyl methacrylate (MBA) and 2-ethylhexyl acrylate (EHA) mixed monomer, wherein the weight ratio of MBA to EHA is 7:3, and the dropping time is controlled within 3 to 4 hours. After the monomer was added dropwise, 20 g of 10% N-hydroxyethylacrylamide (HEMA) aqueous solution was added dropwise within half an hour, and the reaction was continued for 3 hours to obtain a white polymer emulsion.

Embodiment 2

[0057] Add 400g of distilled water and 1.5g of sodium dodecylbenzenesulfonate emulsifier to a four-port reaction vessel with condensed water, set the temperature of the reaction vessel at 72°C, and pass nitrogen to remove oxygen for 30 minutes while stirring. After the internal temperature of the reactor reaches the set temperature, 1.5g of potassium persulfate is added at one time, and 200 grams of concentration are added dropwise at the same time. Butyl ester (MBA) and 2-ethylhexyl acrylate (EHA) mixed monomer, wherein the weight ratio of MBA to EHA is 7:3, and the dropping time is controlled within 3 to 4 hours. After completion, 20 g of 10% N-hydroxyethylacrylamide (HEMA) aqueous solution was added dropwise within half an hour, and the reaction was continued for 3 hours to obtain a white polymer emulsion.

Embodiment 3

[0059] Add 400 g of distilled water and 1.0 g of sodium lauryl sulfate emulsifier to a four-port reaction vessel with condensed water, set the temperature of the reaction vessel at 72°C, and pass nitrogen to remove oxygen for 30 minutes while stirring. After the internal temperature of the reactor reaches the set temperature, 1.5g potassium persulfate is added at one time, and 200 grams of concentration are added dropwise at the same time as 12% hydroxypropyl sulfonate (Haps) aqueous solution of methacrylate and 230g butyl methacrylate. Ester (MBA) and 2-ethylhexyl acrylate (EHA) mixed monomer, wherein the weight ratio of MBA to EHA is 7:3, the dropping time is controlled within 3 to 4 hours, and the monomer dropping is completed After that, within half an hour, 20 g of 10% N-hydroxyethylacrylamide (HEMA) aqueous solution was added dropwise, and the reaction was continued for 3 hours, resulting in a white polymer emulsion.

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Abstract

The invention relates to a lithium ion battery negative electrode aqueous adhesive and a preparation method thereof, and belongs to the field of energy storage device (battery eg.) manufacturing. The lithium ion battery aqueous adhesive comprises polymer emulsion, which comprises a hydrophilic unit, a hydrophobic unit, and an enhancing unit; wherein the hydrophilic unit comprises sulfonic acid groups accounting for 3.0 to 4.0 wt% of the polymer, and the glass-transition temperature of the polymer is -25 to 5 DEG C. Water is taken as the disperse medium, the adhesive is environmentally friendly, the bonding force of the adhesive is strong, and the using amount of the adhesive for negative electrodes can be reduced. The using amount of the adhesive is only 40% of SBR, the using requirements of battery preparation can be satisfied, and the discharging performance is better at a low temperature (-20 DEG C).

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material binder and a preparation method thereof, and belongs to the field of manufacturing energy storage devices such as batteries. Background technique [0002] Lithium-ion battery is the most ideal mobile power source, which has incomparable advantages of other batteries: high energy density, long life, small size, and no pollution. Lithium-ion batteries are widely used in electric vehicles, aerospace, communication equipment and various portable appliances. [0003] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators and non-aqueous electrolytes; positive and negative electrodes are made of powdery electroactive materials, namely lithium transition metal oxide positive electrode materials and carbon negative electrode materials, binders, conductive Agent and current collector composition. It is made by mixing and grinding the electroac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/18C08F216/14C08F220/38C08F220/06C08F220/56C08F220/44C08F2/26C09J133/24C09J133/14C09J129/10H01M4/62
CPCC08F2/26C08F216/14C08F216/1475C08F220/38C08F220/382C08F220/58C08F220/585C09J129/10C09J133/14C09J133/24H01M4/623C08F220/1804C08F220/1808C08F220/56C08F220/06C08F220/44Y02E60/10
Inventor 潘中来邓正华邓佳闽王璐高建东李仁贵杜鸿昌
Owner SICHUAN INDIGO TECH CO LTD
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