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Graphene microsphere

A graphene and microsphere technology, applied in the field of graphene, can solve the problems of volume change, decrease in electrode cycle stability, etc., and achieve the effects of simple process, abundant raw materials, and cost reduction

Inactive Publication Date: 2020-06-09
余姚市晶鹏光伏发电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal oxide materials have a serious volume change effect during the repeated lithium ion deintercalation process, resulting in a significant decrease in the cycle stability of the electrode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A graphene microsphere comprises the steps of:

[0021] 1) Pretreatment of graphite:

[0022] Graphite was placed in a mixed solution composed of concentrated sulfuric acid and potassium permanganate, and was treated with ultrasonic stirring at 20°C for 5 hours. The obtained product was washed, filtered, and dried, and then placed in a muffle furnace. Treat at high temperature for 0.1 h to obtain expanded graphite product for later use; the mass (g) of graphite in the step: the volume (L) of concentrated sulfuric acid: the mass (g) of potassium permanganate=1:0.05:0.1.

[0023] 2) Preparation of graphene microspheres:

[0024] Dissolve the expanded graphite product obtained in step 1) in deionized water, add 5wt% surfactant, and after ultrasonic stirring for 0.1h, gradually add an appropriate amount of titanium source in the solution, the mass ratio of the titanium source to the expanded graphite precursor is 20 : 1; After ultrasonic stirring for 4 hours, add ammonia ...

Embodiment 2

[0027] A graphene microsphere comprises the steps of:

[0028] 1) Pretreatment of graphite:

[0029] Graphite was placed in a mixed solution consisting of concentrated sulfuric acid and potassium permanganate, and treated with ultrasonic stirring at 60°C for 0.5h. The obtained product was washed, filtered, and dried, then placed in a muffle furnace, and heated in a nitrogen atmosphere. Treat at 600°C for 6 hours to obtain expanded graphite product for later use; the mass (g) of graphite in the step: the volume (L) of concentrated sulfuric acid: the mass (g) of potassium permanganate=1:0.1:0.1.

[0030] 2) Preparation of graphene microspheres:

[0031] Dissolve the expanded graphite product obtained in step 1) in deionized water, add 0.1wt% surfactant, and after ultrasonic stirring for 2 hours, gradually add an appropriate amount of titanium source in the solution, the mass ratio of the titanium source to the expanded graphite precursor is 0.1 : 1; add ammonia water after ult...

Embodiment 3

[0034] A kind of graphene microsphere, comprises the steps:

[0035] 1) Pretreatment of graphite:

[0036] Graphite was placed in a mixed solution consisting of concentrated sulfuric acid and potassium permanganate, and treated with ultrasonic stirring at 40°C for 3.5h. The obtained product was washed, filtered, and dried, then placed in a muffle furnace, and heated in a nitrogen atmosphere. Treat at 800°C for 3 hours to obtain expanded graphite product for later use; the mass (g) of graphite in the step: the volume (L) of concentrated sulfuric acid: the mass (g) of potassium permanganate=1:0.07:0.3.

[0037] 2) Preparation of graphene microspheres:

[0038] Dissolve the expanded graphite obtained in step 1) in deionized water, add 3wt% surfactant, and after ultrasonic stirring for 1 h, gradually add an appropriate amount of titanium source in the solution, the mass ratio of the titanium source to the expanded graphite precursor is 10: 1. Add ammonia water after ultrasonic s...

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Abstract

The invention discloses a graphene microsphere. The preparation method comprises the following steps: 1) pretreatment of graphite: putting graphite into a mixed solution composed of concentrated sulfuric acid and potassium permanganate, carrying out ultrasonic stirring treatment, washing the obtained product, filtering, drying, putting the product into a muffle furnace, and treating to obtain an expanded graphite product for later use; 2) preparation of graphene-titanium dioxide microspheres: dissolving the product expanded graphite obtained in the step 1) into deionized water, adding a surfactant, ultrasonically stirring, gradually adding a proper amount of a titanium source into the solution, carrying out spray drying treatment on the obtained mixed solution, carrying out high-temperature treatment on the obtained product in a muffle furnace under the protection of a special atmosphere, washing the obtained product with dilute acid or dilute alkali and a deionized water solution multiple times, and drying in a vacuum drying oven to obtain the graphene-titanium dioxide microspheres. According to the method, graphene and a graphene material are well compounded, so that the electronic conductivity of the material is improved; and the method utilizes a spray drying method to carry out secondary granulation on the precursor, so that the tap density of the product is greatly improved.

Description

technical field [0001] The invention relates to the technology in the field of graphene, in particular to provide a graphene microsphere. Background technique [0002] Lithium-ion batteries have monopolized the portable electronic device market, and lithium-ion batteries will still be the main growth point of the secondary battery market in the next few years. In terms of anode materials for lithium-ion batteries, graphite-based carbon-based materials will still be the preferred anode materials for lithium-ion batteries in the future due to their good cycle stability and ideal charge-discharge platform. However, with the application of lithium batteries in power batteries, the charge-discharge specific capacity of traditional carbon materials is low, which has been unable to meet the needs of high-capacity lithium battery anode materials. Therefore, many R&D teams are developing new negative electrode materials to meet the requirements for high-capacity batteries. In the r...

Claims

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Application Information

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IPC IPC(8): C01B32/19H01M4/62
CPCC01B32/19C01B2204/20H01M4/625Y02E60/10
Inventor 陈莉芳
Owner 余姚市晶鹏光伏发电有限公司
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