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Three-phase organic/inorganic composite gel state polymer electrolyte and preparation method thereof

A technology of composite gel state and electrolyte, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems such as the decline of the mechanical properties of the electrolyte membrane, and achieve the effect of improving the pore formation, improving the mechanical properties, and improving the electrochemical properties

Active Publication Date: 2019-05-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problem that the mechanical properties of the electrolyte membrane are reduced due to the introduction of PEO, and at the same time, ensure the uniform dispersion of the added inorganic filler in the polymer matrix. A stable two-dimensional material, g-C3N4, was introduced into PVDF-HFP and PEO to obtain a three-phase organic / inorganic hybrid gel-state electrolyte

Method used

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  • Three-phase organic/inorganic composite gel state polymer electrolyte and preparation method thereof
  • Three-phase organic/inorganic composite gel state polymer electrolyte and preparation method thereof
  • Three-phase organic/inorganic composite gel state polymer electrolyte and preparation method thereof

Examples

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Embodiment 1

[0023] (1) Take 1g of urea powder and grind it in a mortar for 10-15 minutes until there are no large particles. Pour into a crucible and heat treat in a muffle furnace. The heating rate was 3°C / min, to 550°C, and the temperature was kept for 4 hours. That is, the g-C3N4 stacked in sheets is obtained.

[0024] (2) Take 60 mg of g-C3N4 obtained in (1), add 30 ml of isopropanol, and sonicate for 8 hours to obtain g-C3N4 white suspension dispersion.

[0025] (3) Take 0.8g of PVDF-HFP and 0.2g of PEO, add 2.5ml of the dispersion in (2), then add 8ml of DMF, and stir in a water bath at 60°C for 24 hours. Cast the solution on a polytetrafluoroethylene plate, wait for most of the solvent to volatilize, transfer to a vacuum oven at 80°C, and keep it warm for 12 hours. A thin film was obtained with a film thickness of about 100 μm.

[0026] (4) Transfer the film to the glove box, soak the electrolyte (the electrolyte is a mixed solution of lithium hexafluorophosphate mixed with dim...

Embodiment 2

[0028] (1) Take 0.378g of melamine powder and 0.387g of cyanuric acid powder and dissolve them in dimethyl sulfoxide with heating and stirring until the solution is clear. The two cups of solutions were mixed to obtain a white precipitate, which was filtered and placed in an oven at 80°C for 24 hours. Pour into a crucible and heat treat in a carbonization furnace. Argon atmosphere, heating rate 3°C / min, to 550°C, keep warm for 4 hours. That is, the g-C3N4 stacked in sheets is obtained.

[0029] (2) Take 60 mg of g-C3N4 obtained in (1), add 30 ml of isopropanol, and sonicate for 8 hours to obtain a light yellow suspension of g-C3N4.

[0030] (3) Take 0.85g of PVDF-HFP and 0.15g of PEO, add 2.5ml of the dispersion in (2), then add 8ml of DMF, and stir in a water bath at 60°C for 24 hours. Cast the solution on a polytetrafluoroethylene plate, wait for most of the solvent to volatilize, transfer to a vacuum oven at 80°C, and keep it warm for 12 hours. A thin film was obtained ...

Embodiment 3

[0033] (1) Take 0.378g of melamine powder and 0.387g of cyanuric acid powder and dissolve them in dimethyl sulfoxide with heating and stirring until the solution is clear. The two cups of solutions were mixed to obtain a white precipitate, which was filtered and placed in an oven at 80°C for 24 hours. Pour into a crucible and heat treat in a carbonization furnace. Argon atmosphere, heating rate 3°C / min, to 550°C, keep warm for 4 hours. That is, the g-C3N4 stacked in sheets is obtained.

[0034] (2) Take 60 mg of g-C3N4 obtained in (1), add 30 ml of DMF, and sonicate for 8 hours to obtain a light yellow suspension of g-C3N4.

[0035] (3) Take 0.75g of PVDF-HFP and 0.25g of PEO, add 2.5ml of the dispersion in (2), then add 8ml of DMF, and stir in a water bath at 60°C for 24 hours. Cast the solution on a polytetrafluoroethylene plate, wait for most of the solvent to volatilize, transfer to a vacuum oven at 80°C, and keep it warm for 12 hours. A thin film was obtained with a f...

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Abstract

The invention relates to a three-phase organic / inorganic composite gel state polymer electrolyte and a preparation method thereof to solve the technical problem that the mechanical property of an electrolyte membrane is degraded by introducing PEO. The three-phase organic / inorganic composite gel state polymer electrolyte comprises g-C3N4, PVDF-HFP and PEO, The g-C3N4 is in a lamellar and microsphere shape, and is distributed in PVDF-HFP and PEO systems. The mass of g-C3N4 accounts for 0.1%-20% of the total mass of the electrolyte. The invention also provides a method for preparing the three-phase organic / inorganic composite gel state polymer electrolyte. The three-phase organic / inorganic composite gel state polymer electrolyte can be used in the field of preparation of quasi-solid state lithium ion batteries.

Description

technical field [0001] The invention relates to a battery material and a preparation method thereof, in particular to a three-phase organic / inorganic composite gel state polymer electrolyte applied to a quasi-solid lithium ion battery and a preparation method thereof. Background technique [0002] With the popularization of smart electronic devices, the requirements for the shape and size of secondary batteries are constantly increasing; at the same time, the requirements for battery energy density and power density are also continuously increasing, and the resulting safety issues have also attracted widespread attention. As an important part of quasi-solid-state lithium-ion batteries, gel-state polymer electrolytes play a decisive role in the safety, reliability, and cycle performance of lithium-ion batteries. [0003] For organic / inorganic composite electrolytes, the addition of inorganic particles can reduce the crystallinity of the polymer matrix and promote the migratio...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCY02E60/10
Inventor 兰金叻杜云程杨小平于运花
Owner BEIJING UNIV OF CHEM TECH
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