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Acrylonitrile copolymer binder and its application in lithium-ion batteries

A technology of lithium-ion batteries and adhesives, applied in the direction of nitrile copolymer adhesives, adhesive types, adhesives, etc., can solve the problems of battery performance degradation, large swelling degree, etc., to improve energy density and cycle performance , The effect of excellent battery performance

Active Publication Date: 2018-08-31
SICHUAN INDIGO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polarity and solubility parameters of the acrylate monomer and the carbonate solvent in the electrolyte are close, which causes the swelling degree of the PAN copolymer binder in the electrolyte to be too large, and causes the performance of the core to deteriorate.

Method used

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  • Acrylonitrile copolymer binder and its application in lithium-ion batteries
  • Acrylonitrile copolymer binder and its application in lithium-ion batteries
  • Acrylonitrile copolymer binder and its application in lithium-ion batteries

Examples

Experimental program
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Effect test

preparation example Construction

[0051] The preparation method of the terpolymer is as follows: firstly, an inert gas is introduced into the dispersion medium to drive oxygen, and then acrylonitrile, the second monomer acrylate monomer, the third monomer acrylamide monomer and as required The additives that may be used are raised to 40-80°C under an inert atmosphere, and after the temperature is constant, an initiator is added to carry out a polymerization reaction for 2-24 hours to obtain a polymer dispersion, and finally, through precipitation, filtration, washing, drying, crushing, and Sieve to get the acrylonitrile copolymer adhesive.

[0052] The preparation method of the quaternary copolymer adhesive is as follows: firstly add acrylate monomer to the dispersion medium, stir to dissolve, then add acrylonitrile, the second monomer acrylate monomer, The third monomer, the acrylamide monomer and the additives that may be used according to the needs, are heated to 40-80°C under an inert atmosphere. After the...

Embodiment approach

[0055] As an embodiment, the positive electrode material is LiFePO 4 、LiCoO 2 , LiNiO 2 , Li(Ni x co y mn z )O 2 or LiMn 2 o 4 at least one of the

[0056] A coated separator for lithium ion batteries, using the above-mentioned acrylonitrile copolymer adhesive, the amount of the adhesive accounts for 1-40wt% of the total solids, preferably 5-20wt%.

[0057] As an embodiment, the base film of the diaphragm is a polyolefin microporous film, a polymer woven diaphragm or a polymer non-woven diaphragm, and the filler is at least one of nanoscale inorganic ceramic particles or polymer powder materials.

[0058] According to the acrylonitrile copolymer adhesive of the present invention, the coating diaphragm and lithium ion battery electrode sheet are produced according to the general coating diaphragm preparation route and lithium ion battery production process in this industry, assembled into an aluminum-plastic film flexible packaging battery, and the battery performance t...

Embodiment 1

[0059] Embodiment 1 Preparation of novel adhesive of the present invention

[0060]Add 900 parts of distilled water into the reaction vessel, start stirring, pass high-purity nitrogen gas to remove oxygen for 1 hour, then add 4 parts of methyl acrylate, 12 parts of acrylamide, and 84 parts of acrylonitrile, heat to 60°C under an inert atmosphere and keep the temperature constant; Then add 5 parts of 20% ammonium persulfate initiator solution to initiate the reaction, and finish after 4 hours of reaction. The binder is obtained after filtering, drying, pulverizing and sieving.

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Abstract

The invention relates to an acrylonitrile copolymer binder and its application in lithium ion batteries, belonging to the field of lithium ion batteries. The technical problem solved by the present invention is to provide an acrylonitrile copolymer adhesive, the acrylonitrile copolymer adhesive comprises the following structural units in weight percentage: 78% to 95% of acrylonitrile units, 1 to 10% of acrylate units %, 2-15% of acrylamide units. The adhesive of the present invention uses acrylonitrile monomer as the main body, and adds acrylate monomer, highly polar acrylamide monomer or acrylate monomer to acrylonitrile to carry out copolymerization, thereby maintaining acrylonitrile polymerization At the same time, the strong adhesion force or intermolecular force of the substance molecules endows the polymer film with flexibility, electrolyte affinity and appropriate swelling degree in the electrolyte, so as to adapt to the electrode active material during the charging and discharging process. The volume of intercalation and extraction of lithium ions changes periodically, thereby improving the energy density and cycle performance of lithium-ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically relates to an acrylonitrile copolymer binder and its application in lithium ion batteries. Background technique [0002] Lithium-ion batteries have high energy density and long cycle life, and are widely used in portable electronic devices, electric vehicles, energy storage and other fields. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, diaphragms, electrolytes, and shells. Their working principle is to store and release electrical energy through redox reactions of reversible intercalation / deintercalation of lithium ions in electrode active materials. The preparation method of the positive electrode and the negative electrode of the lithium ion battery is to prepare the positive electrode active material or the carbon negative electrode material together with the electrode binder, the conductive agent, the dispersion medium, etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/44C08F220/56C08F220/14C08F220/18C08F220/06H01M2/16H01M4/13H01M4/62H01M10/0525H01M50/417H01M50/42H01M50/434H01M50/443H01M50/449
CPCC08F220/44H01M4/13H01M4/622H01M10/0525H01M50/443H01M50/42H01M50/417H01M50/449H01M50/434C08F220/56C08F220/1804C08F220/06H01M4/131H01M4/136Y02E60/10H01M50/44C09J133/20C09J2203/33C08F220/48C09D133/20H01M2004/028
Inventor 潘中来张晓正吕川杜鸿昌郭恒周凯陶伟
Owner SICHUAN INDIGO TECH CO LTD
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