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A kind of binder coated on the surface of diaphragm, its preparation method and application

A binder and diaphragm technology, applied in the direction of binder type, nitrile copolymer binder, etc., can solve the problems that the rate performance is difficult to meet the actual needs of power batteries, affect battery life and safety performance, and battery deformation, etc. Achieve the effects of shortening the transmission path, improving rate discharge and cycle performance, and firm bonding

Active Publication Date: 2018-04-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Batteries using traditional separators will deform the battery cell due to winding tension and expansion of the positive and negative electrodes during the cycle, which will affect battery life and safety performance. At the same time, its rate performance is difficult to meet the actual needs of power batteries.

Method used

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  • A kind of binder coated on the surface of diaphragm, its preparation method and application
  • A kind of binder coated on the surface of diaphragm, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The molar ratio of acrylonitrile, methyl methacrylate, acrylic acid, acrylamide, and water is 1.5:1:1:0.5:20, and the initiator ammonium persulfate accounts for 5% of the total amount of reactants; the above raw materials are of analytical grade and above purity.

[0020] Preparation:

[0021] Acrylonitrile was prepared as a 40% aqueous solution and added dropwise to the reactor within 1.5 hours; acrylamide was prepared as a 30% aqueous solution and added dropwise to the reactor within 1.5 hours; The amount of 5% is prepared into a 20% aqueous solution, which is added dropwise to the reactor within 2.5 hours. The remaining reactants and water are added to the reactor at one time, and the reaction is stirred. The reaction temperature is 30°C, and the reaction time is 2 hours. The solid content of the final active substance is 20%.

Embodiment 2

[0023] The molar ratio of acrylonitrile, methyl methacrylate, methacrylic acid, acrylamide, and water is 2:1:1:0.5:18, and the amount of initiator potassium persulfate is 6% of the total amount of reactants.

[0024] Preparation:

[0025] Acrylonitrile is formulated as a 50% aqueous solution and added dropwise to the reactor within 1 hour; acrylamide is prepared as a 40% aqueous solution and added dropwise to the reactor within 1 hour; The dosage of 15% is formulated into a 15% aqueous solution and added dropwise to the reactor within 2 hours, and the remaining reactants and water are added to the reactor at one time, and the reaction is stirred, the reaction temperature is 70 ° C, and the reaction time is 4 hours. Content 25%.

Embodiment 3

[0027] The molar ratio of acrylonitrile, methyl methacrylate, maleic anhydride, acrylamide, and water is 2:1:1:0.7:15.7, and the amount of initiator hydrogen peroxide and ammonium persulfate is the total amount of reactants 4.5%.

[0028] Preparation:

[0029] Add methyl methacrylate, acrylic acid, and water into the reactor in molar ratio, acrylonitrile is made into a 45% aqueous solution and added dropwise to the reactor within 1 hour, and acrylamide is made into a 45% aqueous solution in 1.5 hours Add it dropwise to the reactor within the time, the initiator hydrogen peroxide and ammonium persulfate are formulated into 10% aqueous solution in the amount of 4.5% of the total amount of the reactant, and drop it into the reactor within 2.5h, the remaining reactant and water Add it to the reactor at one time, stir and react, the reaction temperature is 50°C, the reaction time is 8h, and the solid content of the active substance after the reaction is 30%.

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Abstract

The invention discloses a binding agent coateing the surface of a diaphragm as well as a preparation method and application of the binding agent. The binding agent is prepared from acrylonitrile, methyl methacrylate, an unsaturated carboxylic acid monomer, acrylamide, water and an initiator; the mol ratio of the acrylonitrile to the methyl methacrylate to the unsaturated carboxylic acid monomer to the acrylamide to the water is (1.5 to 2.5) : 1 : 1 : (0.5 to 1) : (6.67 to 55); the initiator accounts for 0.5 percent to 0.8 percent of the total mass of reaction materials. By coating between the diaphragm and positive and negative pole pieces with the binding agent, the binding is firm and a boundary has no gap; a transmission way of lithium ions is shortened and a high-temperature energy storage property of batteries can be improved; the safety of the batteries under a working condition is improved; furthermore, the diaphragm of the binding agent is utilized, so that the liquid preserving amount of electrolyte can also be increased, and rate discharge and circulating properties are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a binder coated on the surface of a separator and a preparation method thereof, which are used for bonding the separator to a positive pole piece and a negative pole piece. Background technique [0002] At present, oil energy is being consumed in large quantities. China has surpassed the United States to become the world's largest oil importer. Energy use has also brought about environmental pollution problems, especially the outbreak of PM2.5. Among them, the exhaust emissions of traditional fuel vehicles "contribute" a lot. China's car ownership ranks second in the world after the United States, and the pressure on energy conservation and environmental protection is increasing. From the perspective of energy saving and emission reduction, the development of electric vehicles has far-reaching significance and is imminent. As one of the core components ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/20C08F220/48C08F220/14C08F220/56C08F220/06C08F222/06
CPCC08F220/48C09J133/20C08F220/14C08F220/56C08F220/06C08F222/06
Inventor 刘中奎胡家佳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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