Three-dimensional nitrogen-doped graphene@βcyclodextrin@sulfur composite material, preparation method and application
A technology of nitrogen-doped graphene and β-cyclodextrin, which is applied in nanotechnology, nanotechnology, structural parts, etc. for materials and surface science, can solve problems such as unsatisfactory technological development and limited energy density, and achieve The preparation method is simple, the sulfur content is high, and the effect of improving Coulombic efficiency and cycle stability
Active Publication Date: 2019-06-25
YANGZHOU UNIV
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Problems solved by technology
However, in the fields of electric vehicles, aerospace and national defense equipment, the current commercial lithium-ion secondary batteries are limited by the energy density, which is far from meeting the needs of technological development.
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Embodiment 1
[0023] 1) Preparation of 3D-N-rGO material:
[0024] Take 40ml (concentration: 2mg / ml) graphene oxide (GO) solution and mix it with 0.6g urea, stir it magnetically for half an hour at room temperature, then transfer the mixed solution to a hydrothermal reactor, heat it at 180°C for 12 hours, and freeze it Dried three-dimensional nitrogen-doped graphene sponge (3D-N-rGO)
[0025] 2) Preparation of 3D-N-rGO@β-CD composites:
[0026] The 3D-N-rGO material prepared in step 1) was soaked in a saturated aqueous solution of saturated β-CD, sonicated for half an hour, soaked at room temperature for 24 hours, and freeze-dried to obtain a 3D-N-rGO@β-CD composite material.
[0027] 3) Preparation of 3D-N-rGO@β-CD@S composite materials:
[0028] The 3D-N-rGO@β-CD composite material prepared in step 2) was mixed and ground with sublimed sulfur at a mass ratio of 80mg: 390mg, and the mixed material was reacted at 155°C for 20 hours under the protection of nitrogen to obtain 3D-N-rGO @β-C...
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The invention discloses a three-dimensional nitrogen-doped graphene@β-cyclodextrin@sulfur composite material, a preparation method and its application. The three-dimensional nitrogen-doped graphene is placed in a saturated solution of β-cyclodextrin and then soaked to form The three-dimensional nitrogen-doped graphene@β cyclodextrin composite material is mixed and ground with sublimated sulfur for reaction, and then calcined at high temperature under the protection of nitrogen to obtain the composite material. The preparation method of the present invention is simple, easy to operate, and the prepared composite material has higher sulfur content, and the sulfur nanoparticles are uniformly dispersed on the graphene, and due to the unique performance of β-cyclodextrin, it can absorb polysulfides Effectively prevent polysulfides from flowing into the electrolyte, so that the effect of improving the Coulombic efficiency and cycle stability of the battery can be achieved.
Description
technical field [0001] The invention belongs to the technical field of chemical battery preparation, and specifically relates to a three-dimensional nitrogen-doped graphene@βcyclodextrin@sulfur composite material, a preparation method and its application. Background technique [0002] With the increasing depletion of fossil fuels and the increasingly serious environmental problems caused by their combustion, it is urgent to find new energy sources. At the same time, the rapid development of portable devices such as mobile phones, notebook computers, digital cameras, and electric vehicles, and the Secondary batteries are widely used. Among them, lithium-ion secondary batteries, which appeared in the 1990s, are a new generation of chemical power sources recognized in the world, and have been successfully commercialized and rapidly developed in the field of portable devices. However, in the fields of electric vehicles, aerospace and national defense equipment, the current comm...
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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 倪鲁彬杨光刁国旺
Owner YANGZHOU UNIV