Composite material with sandwich structure and preparation method thereof and application thereof

A composite material, sandwich-type technology, applied in the direction of structural parts, electrical components, electrochemical generators, etc., can solve the problems of poor cycle performance, large volume deformation, weak conductivity, etc., to achieve expanded application range, high capacity, The effect of large specific surface area

Active Publication Date: 2019-04-05
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to design a kind of graphene-molybdenum disulfide-nitrogen-doped porous graphene composite material with sandwich structure, which is used as the negative electrode material of sodium ion battery, and solves the problem of poor cycle performance of pure molybdenum disulfide as negative electrode material. Good, weak conductivity, poor rate, large volume deformation and other technical problems

Method used

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  • Composite material with sandwich structure and preparation method thereof and application thereof
  • Composite material with sandwich structure and preparation method thereof and application thereof

Examples

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Effect test

Embodiment 1

[0044] The sandwich structure graphene-molybdenum disulfide-nitrogen-doped porous graphene composite (NPGRs@MoS 2 @GRs):

[0045] The previous steps (a)-(d) are the same as those in Comparative Example 2.

[0046] (e) Preparation of sandwich-type graphene-molybdenum disulfide-nitrogen-doped porous graphene composite: take 100 mg of NPGRs@MoS from step (d) 2 Disperse in 100mL deionized water, add 2.91mg cetyltrimethylammonium bromide, stir and react for 30min, add 15mL uniformly dispersed 2mg / mL graphene oxide solution, heat up to 98°C, add 0.5mL hydrazine hydrate After reacting for 6h, the intermediate product was washed and dried. The above products were dried and put 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 5°C / min, and cooling to room temperature at 5°C / min after constant temperature for 1 hour to obtain a sandwich ...

Embodiment 2

[0051] The sandwich structure graphene-molybdenum disulfide-nitrogen-doped porous graphene composite (NPGRs@MoS 2 @GRs):

[0052] The synthesis of graphene oxide is the same as the method of comparative example 2 step (a).

[0053] (b) 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 a polystyrene solution concentration of 0.0754 g / mL.

[0054] (c) 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 ...

Embodiment 3

[0059] The sandwich structure graphene-molybdenum disulfide-nitrogen-doped porous graphene composite (NPGRs@MoS 2 @GRs):

[0060] The synthesis of graphene oxide is the same as the method of comparative example 2 step (a).

[0061] (b) 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.

[0062] (c) 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 graph...

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Abstract

The invention discloses a composite material with a sandwich structure and a preparation method thereof and application thereof. A molybdenum disulfide interlayer is grown on a nitrogen-doped porous graphene substrate by using the similarity of the structure, and the outermost graphene protective film layer is further disposed. The composite material with a sandwich structure and the preparation method thereof and application thereof can effectively solve the technical problems that the molybdenum disulfide is used as a negative electrode material with poor cycle performance, weak conductivityand large volume deformation, the inner layer of the nitrogen-doped porous graphene substrate can be used as a molybdenum disulfide growth template to improve the material conductivity by employing the good electron transporting ability while reducing the molybdenum disulfide, the outer layer of graphene acts as a protective layer film to effectively buffer the volume expansion caused when the sodion is inlaid or taken off so as to improve the material stability and the rate capability. The design method is novel, good in repeatability and high in operability, can be used for the negative electrode material of sodium ion battery to achieve excellent performances such as high conductivity, excellent cycle stability and high rate, and has wide application.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials-electrode materials for sodium ion batteries. More specifically, the invention relates to a sandwich-structured graphene-molybdenum disulfide-nitrogen-doped porous graphene composite material and its preparation method and application. Background technique [0002] With the new energy challenges facing the world and people's increasing demand for miniature portable electronic devices and large high-powered devices (such as mobile phones, notebooks, hybrid electric vehicles, aerospace navigation, medical applications, etc.), it is necessary to explore and study a , low-cost energy storage equipment is particularly important. At present, lithium-ion batteries have been widely used and developed rapidly in various fields due to their advantages such as long cycle life, high working voltage, high energy density, wide temperature range, environmental friendliness, low pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/054C01B32/182
CPCH01M4/366H01M4/5815H01M4/583H01M4/625H01M10/054C01B32/182Y02E60/10
Inventor 蒋仲庆郝晓琼
Owner ZHEJIANG SCI-TECH UNIV
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