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Preparation method of vinylidene fluoride polymer of lithium ion battery electrode material binder

A lithium-ion battery, vinylidene fluoride technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unfavorable process continuity, high temperature resistance and coloring properties, molecular weight size is not specifically discussed, and particle size is large.

Active Publication Date: 2015-04-08
ZHEJIANG FLUORINE CHEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest defect of this method is that the particle size of the product is too large, which is not conducive to dissolution, and the operation of double reactors is not conducive to the continuity of the process. This method does not specifically discuss the high temperature coloring resistance and molecular weight of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 12Kg deionized water, 6g sodium carboxymethyl cellulose, 4.5g sodium pyrophosphate, 4.5g sodium acid pyrophosphate, 200g methyl methacrylate in a 20L high-pressure reactor, purging nitrogen and deoxygenation to test the pressure, so that The oxygen content in the kettle is lower than 20ppm; add 2.3Kg vinylidene fluoride from the initial tank, turn on the stirring paddle at a speed of 1100r / min, raise the temperature to 47°C, add 5g perfluoroacyl peroxide, 25g diethyl carbonate The ester starts to react; the vinylidene fluoride monomer is added with a membrane pump to keep the reaction pressure at 7.2MPa, and the reaction ends after 6.2h; the polymer slurry is devolatilized in a degassing tank to recover unreacted monomer; Wash the polymer slurry with ionic water until the conductivity of the washing solution drops below 1 μs / cm, and then spray-dry the slurry with a concentration of 35% at 105°C to obtain a finished product. Test performance, the results are listed i...

Embodiment 2

[0037] Add 12Kg deionized water, 8g sodium carboxymethylcellulose, 4.5g sodium pyrophosphate, 4.5g sodium acid pyrophosphate, 300g methyl methacrylate in a 20L autoclave; The oxygen content in the kettle is lower than 20ppm; add 2.4Kg vinylidene fluoride from the initial tank, turn on the stirring paddle at a speed of 1200r / min, raise the temperature to 50°C, add 4.9g perfluoroacyl peroxide, 33g dicarbonate Ethyl ester starts to react; add vinylidene fluoride monomer with a membrane pump to keep the reaction pressure at 7.5MPa, and the reaction ends after 5.6h; the polymer slurry is devolatilized in a degasser, and the unreacted monomer is recovered; Wash the polymer slurry with deionized water until the conductivity of the washing solution drops below 1 μs / cm, and then spray dry the slurry with a concentration of 36% at 100°C to obtain a finished product. Test performance, the results are listed in Table 1.

Embodiment 3

[0039] Add 12Kg of deionized water, 4.5g of sodium carboxymethylcellulose, 4.5g of sodium pyrophosphate, 4.5g of sodium acid pyrophosphate, and 250g of methyl methacrylate into a 20L high-pressure reactor; Make the oxygen content in the kettle lower than 20ppm; add 2.5Kg of vinylidene fluoride from the initial tank, turn on the stirring paddle at a speed of 1000r / min, raise the temperature to 48°C, add 5.6g of perfluoroacyl peroxide and 39g of acetic acid with a metering pump Ethyl ester starts to react; add vinylidene fluoride monomer with a membrane pump to keep the reaction pressure at 7.3MPa, and the reaction ends after 5.2h; the polymer slurry is devolatilized in a degasser, and the unreacted monomer is recovered; Wash the polymer slurry with deionized water until the conductivity of the washing liquid drops below 1 μs / cm, and then spray dry the slurry with a concentration of 40% at 108°C to obtain a finished product. Test performance, the results are listed in Table 1. ...

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Abstract

The invention discloses a preparation method of vinylidene fluoride polymer of a lithium ion battery electrode material binder, and belongs to the technical field of fluor chemical industry. The preparation method comprises the following steps: 1) adding deionized water, a dispersing agent, a pH modifier, a chain transfer agent, vinylidene fluoride and a second monomer to a polymerization reactor; 2) heating the reactor to 32-52 DEG C, reacting at the reaction pressure of 6.0-9.0MPa and the rotating speed of 800-1600r / min, adding an initiator, and finishing reaction for 4-8 hours, so as to prepare vinylidene fluoride slurry; and 3) degassing, washing and drying the polymer slurry to prepare the product. According to the preparation method of vinylidene fluoride polymer of the lithium ion battery electrode material binder, the vinylidene fluoride polymer with ultra-high molecular weight, small particle size, high purity and high heat-resisting stainability is obtained; and the lithium ion battery prepared by the polymer has the advantages of low binder amount, high peeling strength, high energy density and high circulating capacity retention rate.

Description

technical field [0001] The invention belongs to the technical field of fluorine chemical industry, in particular to a preparation method of a vinylidene fluoride polymer used as an electrode material binder of a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in various digital electronic products due to their outstanding advantages such as high energy density, light weight, stable working voltage, long cycle life, high safety performance, and low environmental pollution. The electrodes of the lithium-ion battery are formed by coating the positive and negative electrode materials with a binder on the surface of the current collector. Therefore, the material used as a binder must have the following main characteristics: 1) Make the active materials bond to each other and to the current collector; 2) Electrochemical stability, no reaction and mutual solubility with the electrolyte; 3) Less dosage There is sufficient bonding stren...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F220/06C08F220/14C08F220/18C08F2/38C08F2/20H01M4/62
CPCY02E60/10
Inventor 苗国祥陈炜
Owner ZHEJIANG FLUORINE CHEM NEW MATERIAL
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