Lithium ion battery cathode aqueous adhesive as well as preparation method and cathode material thereof

A lithium-ion battery, water-based binder technology, used in battery electrodes, secondary batteries, adhesive types, etc. Good adhesion and the effect of improving adhesion performance

Active Publication Date: 2019-05-21
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] None of the above comparative documents discussed the results of liquid absorption rate. From an

Method used

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  • Lithium ion battery cathode aqueous adhesive as well as preparation method and cathode material thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0047] Example one

[0048] The specific steps for synthesizing a water-based binder for lithium ion battery negative electrodes are as follows:

[0049] (1) Add 386 g of deionized water, 68 g of methyl acrylate, 150 g of isooctyl acrylate, 60 g of hydroxypropyl methacrylate, 10 g of maleic acid and 8.2 g of AES into a 1000 mL flask, and stir for 30 min to obtain a pre-emulsion.

[0050] (2) Dissolve 0.75 g of ammonium persulfate in 60 g of water to obtain an initiator solution, and dissolve 2.07 g of LiOH in 25 g of water to obtain an lye.

[0051] (3) Add 240 g of water and 0.82 g of diallyl phthalate into a 2000 mL flask equipped with a nitrogen device, condenser, mixer, thermometer and peristaltic pump, and pass in a large amount of nitrogen to increase the temperature. Wait until the temperature rises to 83°C. Then, the pre-emulsion and initiator solution were added dropwise at a constant flow at a constant temperature of 85±1°C for 3 hours. After the addition was completed, the ...

Example Embodiment

[0053] Example two

[0054] The specific steps for synthesizing a water-based binder for lithium ion battery negative electrodes are as follows:

[0055] (1) In a 1000mL flask, add 386g deionized water, 44g methyl methacrylate, 106g n-butyl methacrylate, 98g butyl acrylate, 48g isooctyl methacrylate, 52g cyclohexyl methacrylate, 30g acrylic acid and 9.45g AES were stirred for 30min to obtain a pre-emulsion.

[0056] (2) Dissolve 0.75 g of potassium persulfate in 60 g of water to obtain an initiator solution, and dissolve 4.28 g of NaOH in 25 g of water to obtain an lye.

[0057] (3) Add 240 g of water and 0.82 g of diallyl phthalate to a 2000 mL flask equipped with a nitrogen device, condenser, mixer, thermometer and peristaltic pump, and pass in a large amount of nitrogen to increase the temperature. When the temperature rises to 83°C, Then the pre-emulsion and initiator solution were added dropwise at a constant flow at a constant temperature of 85±1°C for 3 hours. After the additi...

Example Embodiment

[0059] Example three

[0060] The specific steps for synthesizing a water-based binder for lithium ion battery negative electrodes are as follows:

[0061] (1) Add 386 g of deionized water, 75 g of ethyl methacrylate, 45 g of vinyl acetate, 110 g of ethyl acrylate, 40 g of dodecyl methacrylate, 90 g of tetrahydrofuran methacrylate, and 20 g of methyl methacrylate into a 1000 mL flask. Acrylic acid and 5 g of AES were stirred for 30 minutes to obtain a pre-emulsion.

[0062] (2) Dissolve 1 g of ammonium persulfate in 60 g of water to obtain an initiator solution, and dissolve 4.55 g of KOH in 25 g of deionized water to obtain an lye.

[0063] (3) Add 240 g of water, 1.96 g of amino trimethylene phosphonic acid to a 2000 mL flask equipped with a nitrogen device, condenser, mixer, thermometer and peristaltic pump, and pass in a large amount of nitrogen to increase the temperature. Wait until the temperature rises to 83°C, then keep it constant. Add the pre-emulsion and initiator solutio...

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Abstract

The invention discloses a lithium ion battery cathode aqueous adhesive which is prepared from the following monomers through emulsion polymerization: a hard monomer, a soft monomer, a functional monomer, an acid monomer and a cross-linking agent, wherein the weight ratio of the hard monomer to the soft monomer to the functional monomer to the acid monomer to the cross-linking agent is (5-15):(5-18):(2-10):(1-3):(0.05-0.2); the functional monomer is one or a combination of more of hydroxypropyl methacrylate, cyclohexyl methacrylate, methyl tetrahydrofurfuryl acrylate, and acrylic acid monoethylene glycol ester. The adhesive has the advantages that an appropriate water absorption rate, adhesion performance and relatively good capacity retention rate can be maintained. Meanwhile, the invention further discloses a preparation method of the adhesive and a cathode with the adhesive, belongs to the field of high polymer materials, and particularly belongs to the field of lithium ion battery electrode materials.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to the field of lithium-ion battery electrode materials, and discloses a lithium-ion battery negative electrode water-based binder, a preparation method thereof, and a negative electrode material. Background technique [0002] After more than 20 years of development, lithium-ion batteries have gradually entered the fields of economy, life, and military affairs. With the expansion of the application range, the demand for lithium-ion secondary batteries that can be charged and discharged repeatedly and with high capacity is also increasing. However, lithium ions are affected by many factors such as battery materials, processes, and use environments, among which the influence of the binder used to prepare electrodes cannot be underestimated. The binder plays the role of bonding the active material, the conductive agent, and adhering them to the current collector to form a complete elec...

Claims

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Application Information

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IPC IPC(8): C09J133/08C09J133/10C08F220/18C08F220/14C08F220/20C08F222/02C08F218/18C08F212/08C08F220/32C08F218/08H01M4/62H01M4/583H01M10/0525
CPCY02E60/10
Inventor 徐绍君佟锐赵经纬信勇
Owner GUANGZHOU TINCI MATERIALS TECH
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