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Metal nanoparticle loaded on graphene hydrogel composite material and preparation method and application thereof

A graphene hydrogel, metal nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of insufficiency of energy density, low energy density, shedding, pulverization, etc. , to achieve excellent electrochemical performance, inhibit volume expansion, and promote the effect of infiltration

Active Publication Date: 2018-11-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of new energy, the problem of low energy density of lithium-ion batteries and sodium-ion batteries has been to be solved. At present, the negative electrode material of commercial lithium / sodium-ion batteries is graphite, and the theoretical specific capacity is low (372mAh / g for lithium-ion batteries, 372mAh / g for sodium-ion batteries, and 372mAh / g for sodium-ion batteries). Battery <50mAh / g), its energy density is far from meeting the needs of today's society
In addition, traditional powder materials need to add a certain amount of binder and conductive agent, and the electrode sheet is obtained after slurry preparation and coating, resulting in high resistance, low energy density, and easy to fall off and crush during the charging and discharging process. and other phenomena, the capacity is severely attenuated, and the rate performance is also extremely poor; while the hydrogel does not need to add binders and conductive agents, it can be directly used as electrode sheets after slicing, and the resistance during charge and discharge is small, which can achieve high cycle performance. High energy density and high rate capability

Method used

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  • Metal nanoparticle loaded on graphene hydrogel composite material and preparation method and application thereof
  • Metal nanoparticle loaded on graphene hydrogel composite material and preparation method and application thereof
  • Metal nanoparticle loaded on graphene hydrogel composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation:

[0038] (1) First, 4 mL of dilute hydrochloric acid (5 mol / L) was slowly dropped into 40 mL of deionized water under magnetic stirring conditions, and the stirring was continued for 30 min. Then 0.8mmol of SnCl 2 2H 2 O was slowly added dropwise to the above solution under magnetic stirring, and the stirring was continued for 30 min. Subsequently, 80 mg of graphene oxide powder sample was slowly added to the above solution, and ultrasonically dispersed in an ultrasonic disperser for 1 h. Then, put the solution into a 50mL airtight glass volumetric flask, and put it in a water bath at 95°C for 6h to obtain SnO 2 / graphene hydrogel;

[0039] (2) The SnO obtained above 2 After the graphene hydrogel was washed with deionized water, it was shrunk and dried naturally at room temperature for 48 hours, and then placed in a microwave tube furnace under 8% H 2 / 92% Ar atmosphere, heat treatment at 200 ° C, rapid heating, heat preservation for 1 min, and ra...

Embodiment 2

[0042] 1. Preparation:

[0043] (1) First, 4 mL of ascorbic acid (5 mol / L) was slowly dropped into 50 mL of deionized water under magnetic stirring conditions, and the stirring was continued for 40 min. Then, 1.0mmol of Sn(NO 3 ) 2 2H 2 O was slowly added dropwise to the above solution under the condition of magnetic stirring, and the stirring was continued for 40 min. Subsequently, 100 mg of graphene oxide powder sample was slowly added to the above solution, and ultrasonically dispersed in an ultrasonic disperser for 1 h. Then, put the solution into a 60mL airtight glass volumetric flask, and put it in a water bath at 90°C for 2h to obtain SnO 2 / graphene hydrogel;

[0044] (2) The SnO obtained above 2 After the graphene hydrogel was washed with deionized water, it was shrunk and dried naturally at room temperature for 48 hours, and then placed in a microwave tube furnace under 5% H 2 / 95% Ar atmosphere, heat treatment at 130°C, rapid temperature rise, heat preservat...

Embodiment 3

[0047] 1. Preparation:

[0048] (1) First, 4 mL of dilute hydrochloric acid (5 mol / L) was slowly dropped into 50 mL of deionized water under magnetic stirring conditions, and the stirring was continued for 60 min. Then, 1.0 mmol of GeCl 2 Slowly added dropwise to the above solution under the condition of magnetic stirring, and continued to stir for 60min. Then slowly add 100 mg graphene oxide powder sample into the above solution, and ultrasonically disperse for 45 min in an ultrasonic disperser. Then, put the solution into a 60mL airtight glass volumetric flask, and put it in a water bath at 90°C for 8h to obtain GeO 2 / graphene hydrogel;

[0049] (2) the GeO obtained above 2 Loaded on the graphene hydrogel, washed with deionized water, shrunk and dried naturally at room temperature for 48 hours, and then placed in a microwave tube furnace, under H 2 Under atmospheric conditions, heat treatment at 300°C, heat up rapidly, keep warm for 30min and then cool down to room te...

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Abstract

The invention discloses a metal nanoparticle loaded on graphene hydrogel composite material and a preparation method and an application thereof. The composite material is prepared by executing the following steps: uniformly dispersing graphene oxide into a weakly acidic aqueous solution containing a metal salt, performing a water bath reaction at 80-100 DEG C, cooling and washing, naturally shrinking and drying at the room temperature, and then performing heat treatment at 130-140 DEG C under a reducing atmosphere. The composite material maintains a small particle size of metal nanoparticles and is uniformly loaded on the surface of graphene, the average particle size of the metal nanoparticles is 1-5nm, a high density and a self-supporting structure are also realized, and the density canreach 1.5-2.0g / cm3. According to the scheme of the invention, the composite material is prepared by a one-step water bath ion induction method, the composite material can add a binding agent to directly serve as an electrode of a lithium ion battery or a sodium ion battery after being sliced, and can achieve the electrochemical performance of high volume specific capacity, high rate performance and high cycling stability.

Description

technical field [0001] The invention belongs to the technical field of graphene composite nanomaterials, and more specifically relates to a graphene hydrogel composite material loaded with metal nanoparticles and its preparation method and application. Background technique [0002] In the field of new energy, the problem of low energy density of lithium-ion batteries and sodium-ion batteries has been to be solved. At present, the negative electrode material of commercial lithium / sodium-ion batteries is graphite, and the theoretical specific capacity is low (372mAh / g for lithium-ion batteries, 372mAh / g for sodium-ion batteries, and 372mAh / g for sodium-ion batteries). Battery <50mAh / g), its energy density is far from meeting the needs of today's society. Therefore, the development of a high-energy-density and high-stability lithium / sodium ion battery anode material is a research hotspot of many researchers. [0003] Due to the inherent advantages of two-dimensional flexibl...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/38H01M4/387H01M4/62H01M4/625H01M4/628H01M10/0525H01M10/054Y02E60/10
Inventor 李运勇欧长志黄莹朱俊陆袁星星
Owner GUANGDONG UNIV OF TECH
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