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Preparation method of polyvinylidene fluoride modified composite conductive adhesive

A polyvinylidene fluoride, composite conductive technology, applied in circuits, structural parts, electrical components, etc., can solve problems such as modification of PVDF properties, and achieve the effects of reducing polarization degree, high cycle capacity retention, and improving electrical conductivity.

Active Publication Date: 2020-03-24
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only improves the conductivity by simple blending, and does not modify the properties of PVDF.

Method used

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  • Preparation method of polyvinylidene fluoride modified composite conductive adhesive
  • Preparation method of polyvinylidene fluoride modified composite conductive adhesive

Examples

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Effect test

Embodiment 1

[0034] A preparation method of polyvinylidene fluoride modified composite binder for lithium ion battery, comprising the following steps:

[0035] (1) Add 500ml of polyvinylidene fluoride dispersion emulsion with a solid content of 20%wt and 10g of trifluoroethyl methacrylate (TFEMA) in a four-necked flask, wherein the emulsifier content in the emulsion is 1.25g, and nitrogen is purged to remove oxygen , stirred at 200r / min, heated to 75°C, added 0.1g initiator and 0.5g molecular weight regulator;

[0036] (2) During the reaction process, keep the polymerization temperature at 75°C, stir at a speed of 200r / min, keep the reaction for 4 hours, cool down and discharge, and wash the composite material for later use;

[0037] (3) Add 500ml of hydrochloric acid solution with a concentration of 1mol / L, 15g of aniline monomer and 85g of the composite material prepared in step (2) into a four-neck flask, ultrasonically disperse for 1h, weigh 12g of ammonium persulfate and dissolve it i...

Embodiment 2

[0039] A preparation method of polyvinylidene fluoride modified composite binder for lithium ion battery, comprising the following steps:

[0040] (1) Add 500ml of polyvinylidene fluoride dispersion emulsion with a solid content of 20%wt and 30g of trifluoroethyl methacrylate (TFEMA) in a four-necked flask, wherein the emulsifier content in the emulsion is 1.25g, and nitrogen is purged to remove oxygen , stirred at 200r / min, heated to 75°C, added 0.1g initiator and 0.5g molecular weight regulator,

[0041] (2) During the reaction process, the polymerization temperature was kept at 75° C., the stirring speed was 200 r / min, the heat preservation reaction was carried out for 4 hours, the temperature was lowered and the material was discharged, and the composite material was washed for later use.

[0042] (3) Add 500ml of hydrochloric acid solution with a concentration of 1mol / L, 15g of aniline monomer and 85g of the composite material prepared in step (2) into a four-neck flask, ...

Embodiment 3

[0044] The preparation method of polyvinylidene fluoride modified composite binder for lithium ion battery comprises the following steps:

[0045] (1) Add 500ml of polyvinylidene fluoride dispersion emulsion with a solid content of 20%wt and 10g of trifluoroethyl methacrylate (TFEMA) into a four-necked flask, wherein the emulsifier content in the emulsion is 1.25g, and nitrogen is purged to remove oxygen , stirred at 200r / min, heated to 75°C, added 0.1g initiator and 0.5g molecular weight regulator,

[0046] (2) During the reaction process, the polymerization temperature was kept at 70° C., the stirring speed was 200 r / min, the heat preservation reaction was carried out for 6 hours, the temperature was lowered and the material was discharged, and the composite material was washed for later use.

[0047] (3) Add 500ml of hydrochloric acid solution with a concentration of 1mol / L, 15g of aniline monomer and 85g of the composite material prepared in step (2) into a four-neck flask, ...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride modified composite conductive adhesive. The method includes the following steps: (1), adding a polyvinylidene fluoride dispersion emulsion to a reaction kettle, purging nitrogen to remove oxygen, stirring, adding a fluorine-containing monomer, heating, and adding an initiator and a molecular weight regulator; (2), keeping the polymerization temperature and stirring speed unchanged during the reaction, and after completing the reaction, cooling and discharging to obtain a composite material; and (3), adding deionized water, hydrochloric acid, a conductive polymer monomer and the composite material prepared in the step (2) to a reaction tank, performing ultrasonic dispersion, weighing the initiator, dissolving the initiator in the deionized water, adding the mixture to a reaction solution subjected to ultrasonic dispersion, stirring, separating, washing and drying. According to the scheme of the invention, polyvinylidene fluoride is modified by performing graft copolymerization on the fluorine-containing monomer, the crystallinity of PVDF can be reduced, and the stickiness and flexibility of polyvinylidene fluoride can be improved; and by adding the conductive polymer monomer, the conductivity of the composite adhesive can be improved, and the resistance can be reduced.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a preparation method of a polyvinylidene fluoride modified composite conductive adhesive. Background technique [0002] Due to its high operating voltage, high specific energy, fast charging and long cycle life, lithium-ion batteries have been widely used as power sources for mobile devices such as mobile phones, computers, and electric vehicles. It is mainly composed of positive and negative electrodes, electrolyte, separator and shell. The electrodes are mainly composed of active materials, conductive agents, binders and current collectors. The performance of lithium-ion batteries has a great relationship with the electrode manufacturing process, such as the performance of the binder, the ratio of active materials, conductive agents, and binders. [0003] At present, the commonly used binder for lithium-ion batteries is polyvinylidene fluoride resin. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/623Y02E60/10
Inventor 王汉利许克唐妮李秀芬刘德鹏
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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