Preparation method for bamboo-like graphene tube/sulfur composite material

A technology of graphene tubes and composite materials, applied in the direction of graphene, nano-carbon, structural parts, etc., can solve the problems of high cost, unfavorable large-scale application, complicated process, etc., and achieve simple operation, low raw material cost, and good rate performance Effect

Inactive Publication Date: 2020-03-06
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the graphene prepared by the above template method solves the stacking problem of graphene, the process is complicated and the cost is high, which is not conducive to large-scale application.

Method used

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  • Preparation method for bamboo-like graphene tube/sulfur composite material
  • Preparation method for bamboo-like graphene tube/sulfur composite material
  • Preparation method for bamboo-like graphene tube/sulfur composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Preparation of bamboo-shaped graphene tube: weigh 17.95g dicyandiamide, 2.8g cobalt acetate tetrahydrate, 2.8g nickel acetate tetrahydrate, 1.95g ferric nitrate, add 1L deionized water, and stir for 10min at 60°C . After it was uniformly dispersed, the reaction was continued at 60°C for 24 hours. After the reaction, the temperature was raised to 70°C, and the water was evaporated to dryness to obtain a solid product. The product was then put into a vacuum tube furnace, and nitrogen was used as a protective gas. The temperature was raised to 1000°C at a heating rate of 10°C / min, and a high-temperature reduction reaction was carried out. 1h. Subsequently, 50 mL of dilute sulfuric acid solution with a concentration of 0.5 mol / L was added, stirred for 30 minutes, and then centrifuged, and the solid phase was washed and dried to obtain a bamboo-shaped graphene tube.

[0026] 2) Preparation of bamboo-shaped graphene tube / sulfur composite material: the bamboo-shaped graph...

Embodiment 2

[0029] 1) Preparation of bamboo-shaped graphene tube: weigh 35.9g of dicyandiamide, 5.6g of cobalt acetate tetrahydrate, 5.6g of nickel acetate tetrahydrate, 3.9g of ferric nitrate, add 2L of deionized water, and stir for 10min at 60°C . After it was uniformly dispersed, the reaction was continued at 60°C for 24 hours. After the reaction, the temperature was raised to 70°C, and the water was evaporated to dryness to obtain a solid product. The product was then put into a vacuum tube furnace, and nitrogen was used as a protective gas. The temperature was raised to 1000°C at a heating rate of 10°C / min, and a high-temperature reduction reaction was carried out. 1h. Subsequently, 50 mL of dilute sulfuric acid solution with a concentration of 1 mol / L was added, stirred for 30 minutes, and then centrifuged, and the solid phase was washed and dried to obtain a bamboo-shaped graphene tube.

[0030] 2) Preparation of bamboo-shaped graphene tube / sulfur composite material: the bamboo-s...

Embodiment 3

[0033]1) Preparation of bamboo-shaped graphene tube: Weigh 8.975g dicyandiamide, 1.4g cobalt acetate tetrahydrate, 1.4g nickel acetate tetrahydrate, 0.975g ferric nitrate, then add 0.5L deionized water, at 60°C Stir for 10 min. After it was uniformly dispersed, the reaction was continued at 60° C. for 24 hours. After the reaction, the temperature was raised to 70°C, and the water was evaporated to dryness to obtain a solid product, and then the product was placed in a vacuum tube furnace with nitrogen as a protective gas, and the temperature was raised to 1000°C at a heating rate of 10°C / min for high-temperature reduction reaction 1h. Then add 50 mL of dilute sulfuric acid solution with a concentration of 0.5 mol / L, stir for pickling for 30 min, then centrifuge, take the solid phase for washing, and dry to obtain bamboo-shaped graphene tubes.

[0034] 2) Preparation of bamboo-shaped graphene tube / sulfur composite material: mix the bamboo-shaped graphene tube and sulfur at a ...

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Abstract

The invention discloses a preparation method for a bamboo-like graphene tube/sulfur composite material. The method comprises the following steps of: firstly, evaporating a mixed solution of dicyandiamide, cobalt acetate tetrahydrate, nickel acetate tetrahydrate and ferric nitrate to dryness, carrying out high-temperature roasting reduction at 1000-1200 DEG C under the protection of nitrogen, adding dilute sulfuric acid for corrosion to obtain a bamboo-like graphene tube, mixing the bamboo-like graphene tube with sulfur, and carrying out hot melting sulfur volatilization reaction to obtain thebamboo-like graphene tube/sulfur composite material. The bamboo-like graphene tube is prepared by adopting a high-temperature roasting method; the preparation method is simple and convenient to operate and low in raw material cost, stacking of graphene sheet layers is avoided, the effect of physically constraining polysulfide can be achieved, the surface of the prepared graphene tube contains theiron-cobalt-nickel nanoparticles, the lithiation process of the lithium-sulfur battery can be catalyzed, and the prepared battery has the advantages of being high in capacity, good in rate capabilityand long in cycle life.

Description

technical field [0001] The invention belongs to the technical field of chemical batteries, and relates to a preparation method of a bamboo-shaped graphene tube / sulfur composite material. Background technique [0002] Compared with traditional secondary batteries such as lead-acid batteries and nickel-cadmium batteries, lithium-ion batteries have significant advantages such as high discharge voltage, high energy density, long cycle life, and environmental protection. Most markets in areas such as electric vehicles. At present, the application fields of lithium-ion batteries have been extended to electric vehicles, smart grids, 3G communications, aerospace, national defense and other fields, becoming one of the most promising energy storage devices in the 21st century. [0003] In the lithium (ion) secondary battery system, the cathode material has always been the bottleneck restricting the development of the battery. Cathode materials such as traditional transition metal ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525C01B32/182
CPCC01B32/182H01M4/362H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 付永胜吴震汪信杨宇豪朱嘉桐兰颖洁韩秋瑞袁磊
Owner NANJING UNIV OF SCI & TECH
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