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Preparation method for inorganic nanoparticle/graphene three-dimensional porous composite material

A technology of inorganic nanoparticles and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of graphene sheets and inorganic nanomaterials agglomeration, uneven dispersion of solutions, etc.

Inactive Publication Date: 2016-09-07
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of method can realize the compounding of graphene and inorganic nanomaterials in one step, in this reaction, the uneven dispersion of the solution often leads to serious agglomeration of graphene sheets and inorganic nanomaterials, which in turn restricts the three-dimensional porous compounding of inorganic nanoparticles / graphene. Improvement of rate performance and cycle life when the material is used as lithium battery negative electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Polystyrene microspheres (with a particle size of 300nm) were prepared by soap-free emulsion polymerization. At 40°C, the surface was modified with concentrated sulfuric acid to obtain monodisperse sulfonated polystyrene microspheres. 350mg of Ni(NO) 2 ·6H 2 O was dissolved in 200 mL of sodium citrate solution with a concentration of 0.7 mM, 50 mg of sulfonated polystyrene microspheres were added, ultrasonically dispersed for 30 min, and then the mixture was transferred to a 500 mL round bottom flask, stirred at 90°C for 6 h, centrifuged Wash and dry at 60°C for 12h. Add the prepared polystyrene microspheres loaded with active nanoparticles into water and sonicate for 60 minutes to prepare a uniform dispersion with a concentration of 20 mg / mL. Graphene oxide was prepared by the improved Hummers method, and diluted with water for 30 minutes to obtain a 3 mg / mL dispersion. Mix the two at a volume ratio of 1:3 and sonicate for 120 minutes to obtain a homogeneous mixture...

Embodiment 2

[0019] Polystyrene microspheres (with a particle size of 200nm) were prepared by soap-free emulsion polymerization, and their surface was modified with concentrated sulfuric acid at 40°C to obtain monodisperse sulfonated polystyrene microspheres. 375 mg of SnCl 2 2H 2 O was dissolved in 200 mL of sodium citrate solution with a concentration of 1.0 mM, 50 mg of sulfonated polystyrene microspheres were added, ultrasonically dispersed for 40 min, and then the mixture was transferred to a 500 mL round bottom flask, stirred at 80°C for 7 h, centrifuged Wash and dry at 60°C for 12h. Add the prepared polystyrene microspheres loaded with active nanoparticles into water and sonicate for 100 min to prepare a uniform dispersion with a concentration of 30 mg / mL. Graphene oxide was prepared by the improved Hummers method, and diluted with water for 30 minutes to obtain a 3 mg / mL dispersion. Mix the two at a volume ratio of 1:3 and sonicate for 180 minutes to obtain a uniform mixed solut...

Embodiment 3

[0021] Polystyrene microspheres (with a particle size of 400nm) were prepared by soap-free emulsion polymerization. At 40°C, the surface was modified with concentrated sulfuric acid to obtain monodisperse sulfonated polystyrene microspheres. 400mg of FeCl 3 ·6H 2 O was dissolved in 200 mL of 0.8 mM sodium citrate solution, 60 mg of sulfonated polystyrene microspheres were added, ultrasonically dispersed for 30 min, and then the mixture was transferred to a 500 mL round bottom flask, stirred at 90°C for 8 h, centrifuged Wash and dry at 60°C for 12h. Add the prepared polystyrene microspheres loaded with active nanoparticles into water and sonicate for 120 min to form a uniform dispersion with a concentration of 40 mg / mL. Graphene oxide was prepared by the improved Hummers method, and diluted with water for 30 minutes to obtain a 3 mg / mL dispersion. The two were mixed with a volume ratio of 1:4 and ultrasonically mixed for 120 minutes to obtain a homogeneous mixture. Afterward...

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Abstract

The invention provides a preparation method for an inorganic nanoparticle / graphene three-dimensional porous composite material. According to the preparation method, the inorganic nanoparticle / graphene three-dimensional porous composite material is prepared by the steps of uniformly mixing polystyrene microspheres pre-loaded with inorganic nanoparticles with a graphene oxide solution, then removing a solvent, and packaging and compounding the mixture; and next, removing a polystyrene template through thermal treatment, carrying out thermal reduction on graphene, and keeping the inorganic nanoparticles. The preparation method has the beneficial effects as follows: the polystyrene microspheres are taken as the carrier of the inorganic nanoparticles, so that agglomeration of the inorganic nanomaterial and the graphene lamination can be effectively avoided in the regulation and control process of the porous structure; when the porous composite material is used as the negative electrode of a lithium battery, the inorganic nanoparticles with high theoretical specific capacity supplies possibility for implementation of the high energy density of the material; the three-dimensional conductive network formed by graphene supplies possibility for implementation of the high power density; and in addition, due to the three-dimensional porous structure, the volume change caused by lithium intercalation / deintercalation of the active particles can be effectively relieved, so that the cyclic stability of the material is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, and in particular relates to a preparation method of an inorganic nanoparticle / graphene three-dimensional porous composite material. Background technique [0002] As an important part of lithium-ion batteries, negative electrode materials directly affect the energy density, cycle life and safety performance of batteries. At present, carbon-based materials, such as graphite, carbon microspheres, and pyrolytic carbon, are more maturely used in the negative electrode application of lithium-ion batteries. However, due to the low theoretical capacity (372mA·h / g) and poor rate performance of such carbon materials, it is difficult to meet the requirements of high-performance ion batteries. Graphene-based materials, especially graphene three-dimensional porous materials, are widely used in lithium-ion battery anode materials due to their high conductivity, large specific s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525H01M4/583H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 徐志伟王利媛王维石睫滕堃玥杨彩云李翠玉李凤艳
Owner TIANJIN POLYTECHNIC UNIV
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