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A sandwich-structured graphene/molybdenum selenide/nitrogen-doped porous graphene composite material and its preparation method and application

A technology of porous graphene and sandwich structure, which is applied in the direction of structural parts, electrochemical generators, active material electrodes, etc., can solve the problems of weak conductivity, poor rate performance, poor cycle performance, etc., and achieve enhanced conductivity and reduced Self-aggregation, the effect of overcoming conductivity

Active Publication Date: 2022-04-01
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of sandwich structure graphene / molybdenum selenide / nitrogen-doped porous graphene composite material and preparation method thereof, and be used for sodium ion battery negative electrode material, to solve above-mentioned pure molybdenum selenide as Negative electrode materials have technical problems such as poor rate performance, poor cycle performance, and weak conductivity

Method used

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  • A sandwich-structured graphene/molybdenum selenide/nitrogen-doped porous graphene composite material and its preparation method and application
  • A sandwich-structured graphene/molybdenum selenide/nitrogen-doped porous graphene composite material and its preparation method and application
  • A sandwich-structured graphene/molybdenum selenide/nitrogen-doped porous graphene composite material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Graphene / molybdenum selenide / nitrogen-doped porous graphene (NPGRs@MoSe) were synthesized as follows 2 @GRs):

[0056] Steps (1)-(4) adopt the same method as Comparative Example 2.

[0057] (5) Graphene / molybdenum selenide / nitrogen-doped porous graphene (NPGRs@MoSe 2 Synthesis of @GRs): Take 100 mg of the product of step (4) and dissolve it in 100 mL of deionized water, add 2.91 mg of hexadecyltrimethylammonium bromide, stir and react for 30 minutes, then add 15 mL of 2 mg / mL The graphene oxide solution was heated to 98°C, and 0.5 mL of hydrazine hydrate was added to react for 6 hours, and the product was washed and dried. After the above drying, put it into a nitrogen tube furnace for pyrolysis. Among them, the pyrolysis process includes: rising from room temperature at 2°C / min to 420°C, keeping the temperature for 2 hours, then rising to 750°C at 2°C / min, and cooling to room temperature at 5°C / min after constant temperature for 1 hour.

[0058] figure 1 The XRD tes...

Embodiment 2

[0062] Graphene / molybdenum selenide / nitrogen-doped porous graphene (NPGRs@MoSe) were synthesized as follows 2 @GRs):

[0063] Step (1) adopts the same method as Comparative Example 2.

[0064] (2) Preparation of polystyrene (PS): 10g styrene (St) and 0.67g polyvinylpyrrolidone (PVP) were dissolved in 160mL deionized water, then added to a reaction flask with a stirring and condensing device, and Place in an oil bath and start stirring to mix evenly, add 25mL of 20g / L 2,2'-azobisisobutylamidine hydrochloride (AIBA) solution, continue to blow nitrogen, and heat up to 75°C after 90min After reacting for 35 hours, 5 mL was taken and dried in an oven to obtain polystyrene pellets.

[0065] (3) Preparation of nitrogen-doped porous graphene (NPGRs): Add 2 g of PS pellets (ie, 26.5 mL of PS solution) into 500 mL of 0.2 M HCl solution, and start stirring. Add 200mg of graphene oxide into 30mL of deionized water and sonicate for 50min, add it to the above solution, stir and react at ...

Embodiment 3

[0070] Graphene / molybdenum selenide / nitrogen-doped porous graphene (NPGRs@MoSe) were synthesized as follows 2 @GRs):

[0071] Step (1) adopts the same method as Comparative Example 2.

[0072] (2) Preparation of polystyrene (PS): 10g styrene (St) and 2g polyvinylpyrrolidone (PVP) were dissolved in 60mL deionized water, then added to a reaction flask with a stirring and condensing device, and placed side by side Put it in an oil bath and start stirring to make it evenly mixed, add 20mL 10g / L 2,2'-azobisisobutylamidine hydrochloride (AIBA) solution, continue to blow nitrogen, after 40min, raise the temperature to 65°C and react for 15h , take 5mL and place it in an oven to dry to obtain the concentration of the polystyrene solution to be 0.0754g / mL.

[0073] (3) Preparation of nitrogen-doped porous graphene (NPGRs): Add 2 g of PS pellets (ie, 26.5 mL of PS solution) into 500 mL of 0.2 M HCl solution, and start stirring. Add 200mg of graphene oxide into 30mL of deionized water...

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Abstract

The invention discloses a graphene / molybdenum selenide / nitrogen-doped porous graphene composite material with sandwich structure and its preparation method and application; A molybdenum oxide layer, and a graphene layer on the molybdenum selenide layer as an outer protective film. This method utilizes the similarity in structure to make molybdenum selenide grow in the middle of double-layer graphene, and the nitrogen-doped porous graphene in the inner layer has good conductivity and porous structure, which is beneficial to electron transmission and electrolyte penetration; The graphene protective layer film can reduce the dissolution and destruction of molybdenum selenide, improve the stability and rate performance of the material, and effectively solve the problem of serious self-agglomeration, weak conductivity, large volume deformation, and low capacity when pure molybdenum selenide is used as the negative electrode material of sodium-ion batteries. low technical issues.

Description

technical field [0001] The invention belongs to the technical field of new negative electrode materials for sodium ion batteries, and in particular relates to a sandwich-structured graphene / molybdenum selenide / nitrogen-doped porous graphene composite material and a preparation method and application thereof. Background technique [0002] With the rapid influx of various portable electronic devices, electric vehicles, and smart grids into the market in recent years, the demand for electrochemical energy storage systems continues to increase. At present, lithium-ion batteries occupy a dominant position due to their advantages such as high operating voltage, high energy density, and environmental friendliness. However, due to defects such as limited lithium resource reserves, uneven distribution, and difficulty in recycling, the price of lithium batteries has remained high, unable to meet the huge and expanding demand, and is not conducive to long-term sustainable development. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/581H01M4/625H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 蒋仲庆郝晓琼
Owner ZHEJIANG SCI-TECH UNIV
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