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A three-dimensional high-density metal nanoparticle/graphene porous composite material and its preparation method and application

A technology of porous composite materials and metal nanoparticles, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as low theoretical specific capacity and unsatisfactory energy density, and achieve high specific surface area , Improve space utilization and avoid reunion

Active Publication Date: 2021-08-17
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the current commercial lithium / sodium-ion battery anode material - graphite, has a low theoretical specific capacity (372mAh / g for lithium-ion batteries, <50mAh / g for sodium-ion batteries), resulting in an energy density that cannot meet the growing demands of society. needs

Method used

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  • A three-dimensional high-density metal nanoparticle/graphene porous composite material and its preparation method and application
  • A three-dimensional high-density metal nanoparticle/graphene porous composite material and its preparation method and application
  • A three-dimensional high-density metal nanoparticle/graphene porous composite material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Preparation:

[0044] (1) First, the graphene oxide and KOH solids were mixed and stirred for 4h with a mass ratio of 1:3 (stirring rate was 500rpm), and then placed at room temperature for 20h;

[0045] (2) Dry the above-mentioned product at 65°C for 24h under air conditions, then place it in a tube furnace for 1h at 800°C, and after natural cooling, wash and dry it with 0.1mol / L dilute hydrochloric acid and deionized water After processing, porous graphene is obtained;

[0046] (3) 80 mg of the porous graphene powder sample prepared above was added to 448 mL of ethanol solution, and ultrasonicated in an ultrasonic disperser for 20 min. Then, 0.4mmol of SnCl 4 Slowly added to the above ultrasonic solution under the condition of magnetic stirring. Then, measure 32 mL of deionized water, slowly drop it into the above ultrasonic solution under magnetic stirring, and magnetically stir for 30 min. Then, put the solution in a hydrothermal kettle and heat it in a vacuu...

Embodiment 2

[0052] 1. Preparation:

[0053] (1) First, the graphene oxide and KOH solids were mixed and stirred for 8h (stirring rate was 500rpm) at a mass ratio of 1:3, and then placed at room temperature for 24h;

[0054] (2) Dry the above-mentioned product at 70°C for 24h under air conditions, then place it in a tube furnace for 3h at 700°C, and after natural cooling, wash and dry it with 0.1mol / L dilute hydrochloric acid and deionized water After processing, porous graphene is obtained;

[0055] (3) Add 100 mg of the porous graphene powder sample prepared above into 560 mL of methanol solution, and ultrasonicate for 15 min in an ultrasonic disperser. Then, 0.8mmol of Sn(NO 3 ) 4 Slowly added to the above ultrasonic solution under the condition of magnetic stirring. Then, measure 40 mL of deionized water, slowly drop it into the above ultrasonic solution under magnetic stirring, and magnetically stir for 30 min. Then, put the solution in a hydrothermal kettle and heat it in a vacu...

Embodiment 3

[0061] 1. Preparation:

[0062] (1) First, the graphene oxide and KOH solids were mixed and stirred for 6h (stirring rate was 500rpm) at a mass ratio of 1:3, and then placed at room temperature for 12h;

[0063] (2) Dry the above-mentioned product at 80°C for 24h under air conditions, then place it in a tube furnace for 0.5h at 1000°C, and after natural cooling, wash and dry it with 0.1mol / L dilute hydrochloric acid and deionized water After dry processing, porous graphene is obtained;

[0064] (3) 100 mg of the porous graphene powder sample prepared above was added to 560 mL of ethylene glycol solution, and ultrasonicated in an ultrasonic disperser for 20 min. Then, 0.4mmol of GeCl 4 Slowly added to the above ultrasonic solution under the condition of magnetic stirring. Then, measure 40 mL of deionized water, slowly drop it into the above ultrasonic solution under magnetic stirring, and magnetically stir for 30 min. Then, put the solution in a hydrothermal kettle, and hea...

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Abstract

The invention discloses a three-dimensional high-density metal nanoparticle / graphene porous composite material, a preparation method and application thereof. The porous composite material is made by adding potassium hydroxide into the graphene oxide aqueous solution, and reacting at 700-1000°C after drying, and the porous graphene is obtained after washing and drying; the porous graphene is ground into powder and dispersed into the metal salt-containing In the organic solvent, add deionized water and stir, and carry out hydrothermal reaction at 100-140 ° C. After suction filtration, washing, and drying, add deionized water, and add graphene oxide aqueous solution after stirring. Conduct hydrothermal reaction at 200°C, shrink and dry at room temperature, heat treatment at 150-300°C under reducing atmosphere, and then prepare it. The average particle diameter of metal nanoparticles in the composite material of the present invention is 2-4nm and uniformly loaded on the surface of graphene, with high density and self-supporting structure, and the density reaches 2.0g / cm 3 above.

Description

technical field [0001] The invention belongs to the technical field of graphene composite nanomaterials, and more specifically relates to a three-dimensional high-density metal nanoparticle / graphene porous composite material and its preparation method and application. Background technique [0002] At present, the volumetric energy density of energy storage materials and devices needs to be further improved, and the realization of densified energy storage has become a hot research topic today. The lower density means that the mass of the active material in the limited space is smaller, which leads to the low volume energy density of the electrode material and the energy storage system. Therefore, in order to achieve densified energy storage, improving the electrode space utilization is the most important heavy. High-density electrode materials can have high energy in a small volume of materials, which can meet people's increasingly high energy storage requirements and promot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525H01M10/054B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/583H01M10/0525H01M10/054Y02E60/10
Inventor 李运勇欧长志黄莹严亮庾见林
Owner GUANGDONG UNIV OF TECH
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