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Polyvinylidene fluoride/graphene composite material, conductive paste, preparation method and application

A polyvinylidene fluoride and composite material technology, applied in the field of conductive paste, preparation, and polyvinylidene fluoride/graphene composite material, can solve the problem of uneven dispersion of graphene, affecting battery packaging and performance consistency, easy precipitation, etc. It can improve the theoretical capacity and cycle life, improve the utilization rate of raw materials, and improve the difficulty of dispersion.

Pending Publication Date: 2022-03-15
XIAMEN KNANO GRAPHENE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the former method, the dispersion of graphene is uneven and easy to precipitate, which affects the consistency of battery packaging and performance, and is not resistant to high voltage, so it is not suitable for the increasingly mainstream high-voltage battery system; the latter method The binder does not have the dispersing ability of graphene and can only act as a physical barrier, which will also cause uneven dispersion and precipitation problems

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  • Polyvinylidene fluoride/graphene composite material, conductive paste, preparation method and application
  • Polyvinylidene fluoride/graphene composite material, conductive paste, preparation method and application
  • Polyvinylidene fluoride/graphene composite material, conductive paste, preparation method and application

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Embodiment 1

[0082] This embodiment discloses a preparation method of a polyvinylidene fluoride / graphene composite material and a conductive paste. The preparation method includes the following steps:

[0083] (1) Add 0.5 g of graphene powder into 1000 g of vinylidene fluoride monomer solution, and ultrasonically disperse for 2 hours to prepare a graphene / vinylidene fluoride monomer mixture.

[0084] (2) Vacuumize the polymerization reactor, feed nitrogen, add 3000g deionized water and graphene / vinylidene fluoride monomer mixture, stir evenly, add 15g sodium lauryl sulfate (emulsifier) ​​and 20g mass concentration It is 10% ammonium hydrogen phosphate solution (pH regulator), stirred for 1h to emulsify.

[0085] (3) Feed vinylidene fluoride gas monomer, keep the reaction system pressure at 2.5 MPa, add 20 g of 2% ammonium persulfate aqueous solution (initiator), heat up to 70° C., and polymerize for 15 minutes.

[0086] (4) Adding 30g concentration at a uniform speed is 2% ammonium persul...

Embodiment 2

[0090] This embodiment discloses a preparation method of a polyvinylidene fluoride / graphene composite material and a conductive paste. The preparation method includes the following steps:

[0091] (1) 1g of graphene powder was added to 1000g of vinylidene fluoride monomer solution, and ultrasonically dispersed for 2h to prepare graphene / vinylidene fluoride monomer mixture;

[0092] (2) Vacuumize the polymerization reactor, feed nitrogen, add 3000g deionized water and graphene / vinylidene fluoride monomer mixture, stir evenly, add 25g sodium lauryl sulfate and 20g mass concentration is 10% Ammonium hydrogen phosphate solution, stirred for 1h to emulsify.

[0093] (3) Feed vinylidene fluoride gas monomer, keep the reaction system pressure at 3.0 MPa, add 30 g of 2% ammonium persulfate aqueous solution, raise the temperature to 100° C., and polymerize for 15 minutes.

[0094] (4) Adding 70g concentration at a uniform speed is 2% ammonium persulfate and 200g concentration is 3.0% ...

Embodiment 3

[0098] This embodiment discloses a preparation method of a polyvinylidene fluoride / graphene composite material and a conductive paste. The preparation method includes the following steps:

[0099] (1) Add 5 g of graphene powder into 1000 g of vinylidene fluoride monomer solution, and ultrasonically disperse for 2 hours to prepare a graphene / vinylidene fluoride monomer mixture.

[0100] (2) Vacuumize the polymerization reactor, feed nitrogen, add 3000g deionized water and graphene / vinylidene fluoride monomer mixture, stir evenly, add 25g sodium dodecyl sulfate, 15g dodecylbenzenesulfonate sodium bicarbonate and 20 g of 10% ammonium bicarbonate solution, stirred for 1 h to emulsify.

[0101] (3) Feed vinylidene fluoride gas monomer, keep the reaction system pressure at 3.0 MPa, add 30 g of dialkyl peroxycarbonate aqueous solution with a concentration of 2%, raise the temperature to 100° C., and polymerize for 15 minutes.

[0102] (4) Adding 70g concentration at a constant speed...

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Abstract

The invention relates to the technical field of conductive materials, in particular to a polyvinylidene fluoride / graphene composite material, conductive slurry, a preparation method and application. The method comprises the following steps: preparing a graphene / vinylidene fluoride monomer mixed solution; uniformly mixing the obtained graphene / vinylidene fluoride monomer mixed solution, deionized water, an emulsifier and a pH regulator in a vacuum reaction chamber; introducing a vinylidene fluoride gas monomer into the vacuum reaction chamber at a preset temperature, adding an initiator into the mixed solution, and carrying out a polymerization reaction for a first preset time under a preset pressure; adding an initiator and a molecular regulator at a constant speed, and carrying out polymerization reaction for a second preset time; recovering the residual vinylidene fluoride gas monomer, and cooling to obtain a composite material emulsion; and adding a demulsifier into the composite material emulsion, filtering and drying in vacuum to obtain the polyvinylidene fluoride / graphene composite material. The mechanical property and the electrical property of the composite material and the conductive slurry can be effectively improved, and the performance of the ion battery is remarkably optimized.

Description

technical field [0001] The present application relates to the technical field of conductive materials, in particular to a polyvinylidene fluoride / graphene composite material, conductive paste, preparation method and application. Background technique [0002] Conductive paste is an important part of ion batteries. Although it occupies a small part in the battery, it greatly affects the performance of ion batteries, and plays an important role in battery cycle performance and capacity. At present, in the related art, the conductive graphene is mainly dispersed by a polyvinylpyrrolidone dispersant to make a conductive paste, or the graphene is directly dispersed by a binder to make a conductive agent directly bonded to the electrode. However, in the former method, the dispersion of graphene is uneven and easy to precipitate, which affects the consistency of battery packaging and performance, and is not resistant to high voltage, so it is not suitable for the increasingly mainst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525H01M10/054H01B1/24
CPCH01M4/625H01M10/0525H01M10/054H01B1/24Y02E60/10
Inventor 洪江彬黄卫明方崇卿林丽萍黄昌荣林建斌王佑安庄重建孙东升
Owner XIAMEN KNANO GRAPHENE TECH CORP