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Preparation method of graphene/stannic oxide composite nanofiber membrane and application

A technology of composite nanofiber and tin dioxide, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reducing surface area, reduce stacking, increase porosity, and improve electrical conductivity Effect

Inactive Publication Date: 2016-04-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But easy to stack into multiple layers, reducing surface area

Method used

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  • Preparation method of graphene/stannic oxide composite nanofiber membrane and application
  • Preparation method of graphene/stannic oxide composite nanofiber membrane and application
  • Preparation method of graphene/stannic oxide composite nanofiber membrane and application

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Experimental program
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Effect test

Embodiment 1

[0032] Graphene (0.05 g) was added to 30 ml of deionized water and sonicated for 0.5 h to disperse the graphene uniformly. NaOH (0.25g) was added under stirring conditions, then tin chloride (0.39g, 1.5mmol) was slowly added to the above solution under stirring conditions, and then the mixture was transferred to a 50ml polytetrafluoroethylene-stainless steel hydrothermal reaction kettle , and continuously reacted at 160°C for 15h. After the reaction was completed, the mixture solution was filtered and washed with ethanol and a large amount of distilled water to completely remove the soluble substances therein. Finally, the product graphene / tin dioxide nanoparticles were vacuum-dried at 60°C.

[0033] At room temperature, the obtained graphene / tin dioxide nanoparticles (0.04 g) were ultrasonically dispersed in a mixed solvent of methanol (8 ml) and water (2 ml). After it was mixed uniformly, PVAc (2 g) was added and stirred for 4 h to form a homogeneous solution. Then, the s...

Embodiment 2

[0038] Graphene (0.05 g) was added to 30 ml of deionized water and sonicated for 0.5 h to disperse the graphene uniformly. NaOH (0.25g) was added under stirring condition, and then the mixture was transferred to a 50ml polytetrafluoroethylene-stainless steel hydrothermal reaction kettle, and reacted continuously at 160°C for 15h. After the reaction was completed, the mixture solution was filtered and washed with ethanol and a large amount of distilled water to completely remove the soluble substances therein. Finally, the product pure graphene nanoparticles were vacuum-dried at 60°C.

[0039] At room temperature, pure graphene nanoparticles (0.04 g) were ultrasonically dispersed in a mixed solvent of methanol (8 ml) and water (2 ml). After it was mixed uniformly, PVAc (2 g) was added and stirred for 4 h to form a homogeneous solution. Then, the solution was sucked into a 10ml plastic syringe equipped with a 22# stainless steel needle, and the receiving device used a metal ro...

Embodiment 3

[0044] After 30 ml of deionized water was sonicated for 0.5 h, NaOH (0.25 g) was added with stirring, then tin chloride (0.39 g, 1.5 mmol) was slowly added to the above solution with stirring, and the mixture was transferred to 50 ml In a polytetrafluoroethylene-stainless steel hydrothermal reactor, and continuously reacted at 160°C for 15h. After the reaction was completed, the mixture solution was filtered and washed with ethanol and a large amount of distilled water to completely remove the soluble substances therein. Finally, the product pure tin dioxide nanoparticles were vacuum dried at 60°C.

[0045] Pure tin dioxide nanoparticles (0.04 g) were ultrasonically dispersed in a mixed solvent of methanol (8 ml) and water (2 ml) at room temperature. After it was mixed uniformly, PVAc (2 g) was added and stirred for 4 h to form a homogeneous solution. Then, the solution was sucked into a 10ml plastic syringe equipped with a 22# stainless steel needle, and the receiving devic...

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Abstract

The invention discloses a preparation method of a graphene / stannic oxide composite nanofiber membrane and an application, and relates to anode materials for lithium-ion batteries. The preparation method comprises the following steps: adding graphene to deionized water and carrying out ultrasonic treatment; adding NaOH and stannic chloride under a stirring condition, and mixing the deionized water evenly to obtain a mixed solution; transferring the mixed solution to a reaction kettle for reaction, and filtering, cleaning and drying the mixed solution to obtain graphene / stannic oxide composite nano-particles; ultrasonically dispersing the graphene / stannic oxide composite nano-particles into a mixed solvent of methanol and water, and adding PVAc to obtain a spinning precursor solution; carrying out high-pressure electrospinning on the spinning precursor solution to obtain a PVAc / graphene / stannic oxide composite nanofiber membrane; and carrying out drying and thermal treatment to obtain the porous graphene / stannic oxide composite nanofiber membrane, wherein the diameters of fibers in the composite nanofiber membrane are 800-1200nm and the lengths are greater than 0.5mm. A conductive agent and a binder do not need to add, and the graphene / stannic oxide composite nanofiber membrane can be directly applied to preparation of the lithium-ion battery as an electrode material.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a preparation method and application of a graphene / tin dioxide composite nanofiber membrane. Background technique [0002] Among the lithium-ion battery anode material oxides currently being studied, SnOx has the best performance, which is more excellent than commercial carbon materials. SnO 2 As a lithium storage material, it has a high theoretical capacity (782mAhg -1 ), high energy density, wide range of raw material sources and low price, etc., but there is a large volume change during the charge-discharge cycle, and the material is easy to pulverize and collapse, resulting in poor cycle performance. So effectively solve the SnO 2 Volume expansion and conductivity issues are the key issues that determine their practical applications. Preparation of SnO with large specific surface area 2 Nanoparticles can effectively reduce its volume expansion. Graphe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/483H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 郭航吴玉玲
Owner XIAMEN UNIV
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