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Nitrogen-doped graphene/molybdenum disulfide composite material and its preparation method and application

A nitrogen-doped graphene and molybdenum disulfide technology, applied in the fields of materials science and electrochemistry, can solve the problems of limiting the activity of electrode materials, achieve the effects of enhancing cycle performance and rate performance, improving stability, and increasing capacity

Inactive Publication Date: 2016-08-17
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the weak electronic and ionic conductivity between adjacent S-Mo-S layers of molybdenum sulfides still limits their activity as electrode materials.

Method used

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  • Nitrogen-doped graphene/molybdenum disulfide composite material and its preparation method and application
  • Nitrogen-doped graphene/molybdenum disulfide composite material and its preparation method and application
  • Nitrogen-doped graphene/molybdenum disulfide composite material and its preparation method and application

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preparation example Construction

[0033] A preferred embodiment of the present invention provides a method for preparing a nitrogen-doped graphene / molybdenum disulfide composite material, which specifically includes the following steps:

[0034] (1) Preparation of graphene oxide solution

[0035] Mix 1-5g of graphite flakes with 2-6g of sodium nitrate by stirring, and add 100-200mL of concentrated sulfuric acid while stirring. After stirring for half an hour, add 10-30g of potassium permanganate, then stir for one day, and place it for one week. Then add 500mL water and 20-50mL H 2 o 2 , and finally the reaction product was centrifugally dialyzed to obtain a graphene oxide solution.

[0036] (2) Preparation of nitrogen-doped graphene / molybdenum disulfide composites

[0037] Step 1. Mix graphene oxide solution, nitrogen-containing precursor, sulfur-containing and molybdenum-containing precursors in a solvent at a temperature of 40-90° C. according to a mass ratio of 1:(1-50):(5-30) , and wherein the molar r...

Embodiment 1

[0042] The present embodiment 1 provides a kind of preparation method of nitrogen-doped graphene / molybdenum disulfide composite material, specifically comprises the following steps:

[0043] (1) Preparation of graphene oxide solution

[0044] Mix 5g of graphite flakes and 5g of sodium nitrate by stirring, and slowly add 200mL of concentrated sulfuric acid while stirring, after stirring for half an hour, slowly add 20g of potassium permanganate, then stir for one day, and place it for a week, then slowly add 500mL of water, Then add 20~50mL H 2 o 2 , and finally the reaction product was centrifugally dialyzed to obtain a graphene oxide solution.

[0045] (2) Preparation of nitrogen-doped graphene / molybdenum disulfide composites

[0046] Step 1. Measure 50 mg of graphene oxide solution and disperse it in 200 mL of deionized water, then add 100 mg of graphitized carbon trinitrogen tetrachloride into it to obtain a mixed solution, ultrasonically treat the mixed solution until u...

Embodiment 2

[0050] The present embodiment 2 provides a kind of preparation method of nitrogen-doped graphene / molybdenum disulfide composite material, specifically comprises the following steps:

[0051] (1) Preparation of graphene oxide solution

[0052] Mix 5g of graphite flakes and 5g of sodium nitrate by stirring, and slowly add 200mL of concentrated sulfuric acid while stirring, after stirring for half an hour, slowly add 20g of potassium permanganate, then stir for one day, and place it for a week, then slowly add 500mL of water, Then add 50mL H 2 o 2 , and finally the reaction product was centrifugally dialyzed to obtain a graphene oxide solution.

[0053] (2) Preparation of nitrogen-doped graphene / molybdenum disulfide composites

[0054] Step 1. Measure 50mg of graphene oxide solution and disperse it in 200mL of deionized water, then add 2g of urea to it to obtain a mixed solution, stir and heat the mixed solution in an oil bath at 90°C, and then put it in the mixed solution 40...

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Abstract

The invention discloses a nitrogen-doped graphene / molybdenum disulfide composite material, and a preparation method and application thereof. The nitrogen-doped graphene / molybdenum disulfide composite material is obtained by mixing a graphite oxide solution, a nitrogen-containing precursor, a sulfur-containing precursor and a molybdenum-containing precursor in a solution, removing the solvent or hetero-ion to obtain a precursor material, performing heat treatment on the precursor material under the protection of an inert gas, and performing nitrogen doping and crystallization. The nitrogen-doped graphene / molybdenum disulfide composite material is applicable to lithium ion batteries, sodium cells, magnesium cells, hydrogen generation under electrocatalysis, hydrogen generation under photocatalysis and super capacitors, and is capable of improving the capacity of an anode material and also enhancing the cycling performance and the rate performance of the anode material when being used as a lithium ion battery anode material.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a nitrogen-doped graphene / molybdenum disulfide composite material and a preparation method thereof. The invention also provides a nitrogen-doped graphene / molybdenum disulfide composite material in lithium Application in ion batteries, the invention belongs to the technical field of material science and electrochemistry. Background technique [0002] As a new type of chemical power source, lithium-ion batteries have been widely used in portable electronic devices such as mobile phones and notebook computers, and are also one of the power sources for the development of electric vehicles. Electrode materials are the key to determine the overall performance of lithium-ion batteries. The theoretical capacity of commercial carbon anode materials is only 372mAh / g, which is increasingly difficult to meet the market's requirements for high cycle performance, high en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/38H01M4/5815H01M4/587H01M10/0525Y02E60/10
Inventor 冯新亮汤艳萍吴东清曹静张帆麦亦勇庄小东
Owner SHANGHAI JIAO TONG UNIV
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