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Preparation method of graphene/sulfur composite material, and application of graphene/sulfur composite material in lithium-sulfur battery

A composite material and graphene technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems affecting the charge-discharge cycle performance of lithium-sulfur batteries, improve the charge-discharge cycle performance, enhance electrode conductivity, Good capacity retention rate

Inactive Publication Date: 2020-01-03
CHERY COMML VEHICLE ANHUI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, as the material of the lithium-sulfur battery sulfur positive electrode carrier, polysulfides dissolved in the electrolyte will be produced during the battery cycle, thereby affecting the charge-discharge cycle performance of the lithium-sulfur battery

Method used

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  • Preparation method of graphene/sulfur composite material, and application of graphene/sulfur composite material in lithium-sulfur battery
  • Preparation method of graphene/sulfur composite material, and application of graphene/sulfur composite material in lithium-sulfur battery
  • Preparation method of graphene/sulfur composite material, and application of graphene/sulfur composite material in lithium-sulfur battery

Examples

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Embodiment 1

[0030] A preparation method of graphene / sulfur composite material, comprising the following steps:

[0031] (1) Mix formaldehyde and resorcinol according to the molar ratio of 2:1, then add graphene, the molar ratio of graphene and resorcinol is 1:2, and then under the constant temperature environment of 85°C, in the oil bath condition Down, stirring speed 160r / min, react 10h, obtain organogel;

[0032] (2) drying the organogel prepared above in an oven at 100° C. under normal pressure for 24 hours to obtain the organogel;

[0033] (3) Next, the organogel in the above step (2) was heated in a nitrogen atmosphere at 5°C min -1 The heating rate was increased to 850° C., and the carbonization was carried out at a high temperature for 8 hours to obtain a graphene-modified carbon material.

[0034] (4) The graphene-modified carbon material and sublimed sulfur were impregnated at 150° C. for 20 h at a mass ratio of 3:4 to obtain a graphene / sulfur composite material.

Embodiment 2

[0036] A preparation method of graphene / sulfur composite material, comprising the following steps:

[0037] (1) Mix formaldehyde and resorcinol according to the molar ratio of 2:1, then add graphene, the molar ratio of graphene and resorcinol is 1:1, and then under the constant temperature environment of 85 ℃, in the oil bath condition Down, stirring speed 160r / min, react 10h, obtain organogel;

[0038] (2) drying the organogel prepared above in an oven at 100° C. under normal pressure for 24 hours to obtain the organogel;

[0039] (3) Next, the organogel in the above step (2) was heated in a nitrogen atmosphere at 5°C min -1 The heating rate was increased to 850° C., and the carbonization was carried out at a high temperature for 8 hours to obtain a graphene-modified carbon material.

[0040] (4) Immerse the graphene-modified carbon material and sublimed sulfur at a mass ratio of 3:4 at 150°C for 20 hours to obtain a graphene-sulfur composite material, and use the graphene-...

Embodiment 3

[0042] A preparation method of graphene / sulfur composite material, comprising the following steps:

[0043] (1) Mix formaldehyde and resorcinol according to the molar ratio of 2:1, then add graphene, the molar ratio of graphene and resorcinol is 1:1.5, and then in the constant temperature environment of 85°C, in the oil bath condition Down, stirring speed 160r / min, react 10h, obtain organogel;

[0044] (2) drying the organogel prepared above in an oven at 100° C. under normal pressure for 24 hours to obtain the organogel;

[0045] (3) Next, the organogel in the above step (2) was heated in a nitrogen atmosphere at 5°C min -1 The heating rate was increased to 850° C., and the carbonization was carried out at a high temperature for 8 hours to obtain a graphene-modified carbon material.

[0046] (4) Immerse the graphene-modified carbon material and sublimed sulfur at a mass ratio of 3:4 at 150°C for 20 hours to obtain a graphene-sulfur composite material, and use the graphene-s...

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Abstract

The invention discloses a preparation method of a graphene / sulfur composite material, and an application of the graphene / sulfur composite material in a lithium-sulfur battery. The preparation method of the graphene / sulfur composite material comprises the following steps: mixing formaldehyde and resorcinol, adding graphene, carrying out an oil bath reaction to obtain an organic gel, drying the organic gel, carrying out high-temperature carbonization in an argon atmosphere to obtain a graphene modified carbon material, mixing the graphene modified carbon material with sublimed sulfur, and performing impregnation to obtain the graphene / sulfur composite material. The preparation method is simple, the prepared graphene / sulfur composite material can effectively inhibit polysulfide generated in the cycle process of the battery from being dissolved in an electrolyte, and can enhance the conductivity of an electrode and obviously improve the charge-discharge cycle performance of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of new energy battery materials, and in particular relates to a preparation method of a graphene / sulfur composite material and its application in lithium-sulfur batteries. Background technique [0002] With the rapid development of human society, the demand for fossil energy is increasing, and people are facing the challenges of resource depletion and environmental problems. Faced with such problems, the understanding and requirements for high specific energy chemical power sources have also become higher. Since the commercialization of lithium-ion batteries, countries around the world have stepped up research and development of lithium-ion batteries for vehicle power. However, due to a series of factors such as energy density, safety and price, traditional lithium-ion batteries such as lithium iron phosphate, lithium manganese oxide and lithium cobalt oxide batteries can no longer meet the requirements of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M10/052
CPCH01M4/13H01M4/362H01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 郭亚晴赵国华潘立升吴磊张静雅
Owner CHERY COMML VEHICLE ANHUI
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