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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 application point of view, liquid absorption rate has a great influence on the stability of the battery.

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

Embodiment 1

[0048] The concrete steps of synthesizing lithium-ion battery negative electrode water-based binder are as follows:

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

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

[0051] (3) Add 240g of water and 0.82g of diallyl phthalate into a 2000mL flask equipped with a nitrogen device, a condenser, a stirrer, a thermometer and a peristaltic pump, and feed a large amount of nitrogen to raise the temperature until the temperature rises to 83°C. Then add the pre-emulsion and initiator solution dropwise at a constant temperature at 85±1°C for 3 hours. After the dropping is completed, keep warm for 1 hour, and then add residual additives three times with ...

Embodiment 2

[0054] The concrete steps of synthesizing lithium-ion battery negative electrode water-based binder 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 of acrylic acid and 9.45g of AES were stirred for 30min to obtain a pre-emulsion.

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

[0057] (3) Add 240g of water and 0.82g of diallyl phthalate into a 2000mL flask equipped with a nitrogen device, a condenser, a stirrer, a thermometer and a peristaltic pump, and feed a large amount of nitrogen to raise the temperature until the temperature rises to 83°C. Then add the pre-emulsion and initiator solution dropwise at a constant temperature at 85±1°C for 3 hours. After the dropping is completed, keep warm for 1 hour, and ...

Embodiment 3

[0060] The concrete steps of synthesizing lithium-ion battery negative electrode water-based binder are as follows:

[0061] (1) Add 386g deionized water, 75g ethyl methacrylate, 45g vinyl acetate, 110g ethyl acrylate, 40g dodecyl methacrylate, 90g tetrahydrofuryl methacrylate, 20g formazan to a 1000mL flask Acrylic acid and 5g of AES were stirred for 30min 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 a lye.

[0063] (3) Add 240g of water and 1.96g of aminotrimethylene phosphonic acid into a 2000mL flask equipped with a nitrogen device, condenser, stirrer, thermometer and peristaltic pump, feed a large amount of nitrogen to raise the temperature, wait until the temperature rises to 83°C, and then Add the pre-emulsion and initiator solution dropwise, keep the temperature at 85±1°C, and last for 3 hours. After the dropwise addition, kee...

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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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