Method for preparing graphene-coated carbon microsphere material by coating graphene oxide on carbon microsphere

A technology of graphene coating and carbon microspheres, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of high cost investment, high cost, and difficulty in large-scale production of carbon sphere three-dimensional structures, and achieve a wide range of applications. Effect

Inactive Publication Date: 2012-07-04
上海碳源汇谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There are some unavoidable problems in the methods of constructing three-dimensional lithium ion electrode materials reported above. First, there are difficulties in the large-scale production of the constructi...

Method used

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  • Method for preparing graphene-coated carbon microsphere material by coating graphene oxide on carbon microsphere
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  • Method for preparing graphene-coated carbon microsphere material by coating graphene oxide on carbon microsphere

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Embodiment 1

[0028] Preparation of carbon microspheres: at room temperature, using deionized water as a solvent, 5 g of glucose and 0.2 g of glutaric acid were made into 40 ml of a clear solution, placed in a reaction kettle with polytetrafluoroethylene as a liner, and heated to Maintain at 180°C for 5 hours, stop heating, and after the reaction kettle is cooled to room temperature, centrifuge the dark brown mixture obtained from the reaction to remove the supernatant; wash and centrifuge the product alternately with water and ethanol for several times until the supernatant until the liquid is colorless and transparent. The final centrifuged product was dried in an oven at 80° C. for 8 hours to finally obtain a dry carbon microsphere product.

[0029] Preparation of graphene oxide dispersion: add 0.2 g of dry graphite oxide to 200 ml of deionized water, and ultrasonicate for 30 minutes to obtain a stable and uniform yellow-brown graphene oxide dispersion with a concentration of 1 mg per ml...

Embodiment 2

[0033] Preparation of carbon microspheres: at room temperature, using deionized water as a solvent, 5 grams of sucrose and 0.2 grams of boric acid were made into 40 ml of a clear solution, placed in a polytetrafluoroethylene-lined reactor, and heated to 120 ° C Maintain under the conditions for 10 hours, stop heating, and after the reaction kettle is cooled to room temperature, centrifuge the dark brown mixed solution obtained from the reaction to remove the supernatant; wash and centrifuge the product in alternating order of water and ethanol for several times until the supernatant is free of until the color is transparent. The final centrifuged product was dried in an oven at 80° C. for 8 hours to finally obtain a dry carbon microsphere product.

[0034] Preparation of graphene oxide dispersion: add 0.2 g of dry graphite oxide to 200 ml of deionized water, and ultrasonicate for 30 minutes to obtain a stable and uniform yellow-brown graphene oxide dispersion with a concentrat...

Embodiment 3

[0038] Preparation of carbon microspheres: at room temperature, using deionized water as a solvent, 5 g of starch and 0.2 g of hydrochloric acid were made into 40 ml of a clear solution, placed in a polytetrafluoroethylene-lined reactor, and heated to 150 ° C Maintain under the conditions for 7 hours, stop heating, and after the reaction kettle is cooled to room temperature, centrifuge the dark brown mixed solution obtained from the reaction to remove the supernatant; wash and centrifuge the product in the order of alternating water and ethanol for several times until the supernatant is free of until the color is transparent. The final centrifuged product was dried in an oven at 40° C. for 16 hours to finally obtain a dry carbon microsphere product.

[0039] Preparation of graphene oxide dispersion: 0.16 g of dry graphite oxide was added to 200 ml of deionized water, and ultrasonicated for 30 minutes to obtain a stable and uniform yellow-brown graphene oxide dispersion with a ...

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Abstract

The invention relates to a method for preparing a graphene-coated carbon microsphere material by coating graphene oxide on a carbon microsphere. The method comprises the following steps of: preparing a graphene oxide dispersion solution; preparing the carbon microsphere through taking glucose, sucrose and starch as a carbon source by using a hydrothermal method under acidic conditions; adding the dried carbon microsphere into the graphene oxide dispersion solution; filtering and drying to obtain a graphene-oxide-coating carbon microsphere product; and carrying out thermal reduction on the graphene-oxide-coating carbon microsphere product under a gas protective atmosphere, and naturally cooling to room temperature to obtain a graphene-coaed carbon microsphere product. Compared with the prior art, the method provided by the invention has the advantages that no harmful substances are used in a preparation process, the range of selectable preparation equipment is wide, the raw materials, i.e. graphene and the carbon microsphere, are not required for being subjected to further modification and processing, the water resources used in the preparation process can be recycled and utilized, and products with different proportions and different degrees of reduction can be prepared according to different needs, so that a precondition is provided for the diversity of materials.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, in particular to a method for preparing a graphene-coated carbon microsphere material by graphene oxide-coated carbon microspheres. Background technique [0002] Driven by energy and policy, as well as the trend of major global automakers moving towards electric vehicles, it can be expected that there will be a huge market for batteries. Among the batteries that can be industrially produced at present, lithium-ion batteries have become a hot field for researchers from all over the world due to their advantages of high monomer voltage, large specific energy, good cycle performance, small self-discharge, fast charge and discharge, and wide operating temperature range; Among them, the application prospect of high-capacity lithium-ion batteries in electric vehicles has attracted great attention from researchers, and high-capacity lithium-ion batteries a...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 郭守武杨永强吴海霞周雪皎
Owner 上海碳源汇谷新材料科技有限公司
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