Method for preparing nitrogen-sulfur double-doped graphene negative electrode material by low-temperature molten salt method

A graphene negative electrode and low-temperature molten salt technology, applied in the direction of graphene, nanotechnology for materials and surface science, chemical instruments and methods, etc., can solve the problems of time-consuming and low yield, and achieve low cost and reliable Strong controllability and low process cost

Active Publication Date: 2020-02-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anode material prepared by this method has excellent cycle stability and rate performance, but there are also problems such as time-consuming and low yield.

Method used

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  • Method for preparing nitrogen-sulfur double-doped graphene negative electrode material by low-temperature molten salt method
  • Method for preparing nitrogen-sulfur double-doped graphene negative electrode material by low-temperature molten salt method
  • Method for preparing nitrogen-sulfur double-doped graphene negative electrode material by low-temperature molten salt method

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Experimental program
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Effect test

Embodiment 1

[0030] The low-temperature molten salt method of the present application prepares nitrogen-sulfur double-doped graphene, applies it to the negative electrode material of lithium-ion batteries, and performs electrochemical performance tests on it. The steps of the method in this embodiment are as follows:

[0031] (1) 0.3g graphene oxide is ultrasonically dispersed in deionized water at room temperature, and 8g potassium thiocyanate is dissolved in deionized water;

[0032] (2) Add potassium thiocyanate solution to the dispersion of graphene oxide, and stir the mixed solution at room temperature for 30 minutes, mix well and then dry at 100°C to obtain a composite of graphene oxide and potassium thiocyanate thing;

[0033] (3) Transfer the compound obtained in (2) to a tube furnace filled with inert gas, heat it to 175°C at a heating rate of 5°C / min, and hold the temperature for 12h to obtain the product, which is cooled to Take out after room temperature;

[0034] (4) The rea...

Embodiment 2

[0043] (1) 0.3g graphene oxide is ultrasonically dispersed in deionized water at room temperature, and 8g thiourea is dissolved in deionized water;

[0044] (2) Add the thiourea solution to the graphene oxide dispersion, and stir the mixed solution at room temperature for 30 min, mix well and then dry at 100°C to obtain a composite of graphene oxide and thiourea;

[0045] (3) Transfer the compound obtained in (2) to a tube furnace filled with inert gas, heat it to 180°C at a heating rate of 5°C / min, and hold the temperature for 12h to obtain the product, which is cooled to Take out after room temperature;

[0046] (4) The reactant obtained in (3) is washed with a large amount of deionized water, filtered, and dried to obtain nitrogen-sulfur double-doped graphene, which is ground into powder and used as a lithium-ion battery negative electrode material.

Embodiment 3

[0048](1) 0.2g graphene oxide is ultrasonically dispersed in deionized water at room temperature, and 10g potassium thiocyanate is dissolved in deionized water;

[0049] (2) Add potassium thiocyanate solution to the dispersion of graphene oxide, and stir the mixed solution at room temperature for 30 minutes, mix well and then dry at 120°C to obtain a composite of graphene oxide and potassium thiocyanate thing;

[0050] (3) Transfer the compound obtained in (2) to a tube furnace filled with inert gas, heat it to 300°C at a heating rate of 10°C / min, and hold the temperature for 12h to obtain the product, which is cooled to Take out after room temperature;

[0051] The reactant obtained in (3) is washed with a large amount of deionized water, filtered, and dried to obtain nitrogen-sulfur double-doped graphene, which is ground into powder and used as a lithium-ion battery negative electrode material.

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Abstract

The invention relates to a preparation method of a nitrogen-sulfur double-doped graphene negative electrode material by low-temperature molten salt method. The preparation method comprises the following steps: uniformly dispersing graphene oxide in deionized water, dissolving potassium thiocyanate in deionized water, uniformly mixing an obtained dispersion liquid with an obtained salt solution, and drying to obtain a compound; introducing the compound into a tubular furnace filled with inert gas to fully react, washing a reaction product with a large amount of deionized water after the reaction is finished, and drying to obtain the nitrogen-sulfur double-doped graphene negative electrode material. Compared with the prior art, industrial products which are low in price and easy to obtain are adopted as raw materials, high-temperature calcination is avoided, and the method has the advantages of being simple in synthesis process, high in controllability, low in cost, and wide in raw material range, and batch preparation can be realized. The prepared nitrogen-sulfur double-doped graphene has the advantages of high capacity, good cycling stability and the like as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and relates to a method for preparing a nitrogen-sulfur double-doped graphene negative electrode material by a low-temperature molten salt method. Background technique [0002] Due to the advantages of high energy density, good cycle life, and environmental friendliness, lithium-ion batteries are currently the main power supply for portable electronic devices. With the continuous expansion of electric vehicles and integrated storage grids, higher requirements are placed on the energy storage efficiency of lithium-ion batteries. At present, commercial lithium-ion batteries mainly use graphite-based negative electrode materials, including natural graphite and artificial graphite, and their theoretical specific capacity is 372mAh / g. [0003] Graphite carbon materials have become good lithium-ion battery anode materials because of their low price, wide range of raw materials i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194B82Y30/00H01M4/587H01M10/0525
CPCC01B32/184C01B32/194H01M4/587H01M10/0525B82Y30/00Y02E60/10
Inventor 黄维艾伟刘磊杜洪方
Owner NORTHWESTERN POLYTECHNICAL UNIV
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