Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Stannic oxide/graphene/carbon composite material and preparation method thereof

A technology of carbon composite materials and tin dioxide, applied in the direction of secondary batteries, electrochemical generators, electrical components, etc., can solve the problems affecting the structural stability and electrochemical performance of materials, so as to improve the cycle stability and strengthen the combination Function, the effect of maintaining structural stability

Active Publication Date: 2016-07-06
CHINA THREE GORGES UNIV
View PDF6 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reported graphene / tin dioxide foam composites, graphene and tin dioxide generally rely on mechanical bonding. After many cycles, the graphene and tin dioxide active phases tend to separate from each other, which affects the structural stability and stability of the material. Electrochemical properties

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Stannic oxide/graphene/carbon composite material and preparation method thereof
  • Stannic oxide/graphene/carbon composite material and preparation method thereof
  • Stannic oxide/graphene/carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Three-dimensional tin dioxide / graphene / carbon foam composite electrode material I

[0024] Cool concentrated sulfuric acid to 0°C, then add graphite and sodium nitrate, stir until uniform, gradually and continuously add potassium permanganate, stir for 3 hours, raise the temperature to 35°C, continue stirring for 0.5h, then gradually and continuously add Ionized water, the temperature rises to 98°C, reacts at this temperature for 15 minutes, moves to normal temperature, adds 10% hydrogen peroxide, stirs for 1 hour, then adds 1M hydrochloric acid and mixes and stirs, and the obtained product is washed with deionized water until it is neutral to obtain oxidised graphite. Graphite oxide was dispersed in deionized water at a concentration of 4 mg / mL, and ultrasonically exfoliated to obtain a graphene oxide material. Mix graphene oxide, tin tetrachloride, and glucose in a mass ratio of 1:5:1. After ultrasonic dispersion is uniform, the mixed solution is transferr...

Embodiment 2 3

[0025] Example 2 Three-dimensional tin dioxide / graphene / carbon foam composite electrode material II

[0026] The graphene oxide material was prepared as described in Example 1, graphene oxide, tin tetrachloride, and glucose were mixed in a mass ratio of 1:10:1, and after ultrasonic dispersion was uniform, the mixed solution was transferred to polytetrafluoroethylene In an ethylene-lined autoclave, a hydrothermal reaction was carried out at 220 °C for 32 hours to obtain a tin dioxide / graphene / carbon liquid gel composite material. The prepared tin dioxide / graphene / carbon liquid gel composite was freeze-dried, followed by heat treatment at 750 °C for 2 h to obtain a three-dimensional tin dioxide / graphene / carbon foam composite. The test conditions of the electrode material are as described in Example 1, charge and discharge at a current density of 100mA / g, the first discharge capacity can reach 1800mAh / g, and the capacity after the second cycle is still 550mAh / g.

Embodiment 3 3

[0027] Example 3 Three-dimensional tin dioxide / graphene / carbon foam composite electrode material III

[0028] The graphene oxide material was prepared as described in Example 1, graphene oxide, tin tetrachloride, and glucose were mixed in a mass ratio of 1:20:1, and after ultrasonic dispersion was uniform, the mixed solution was transferred to polytetrafluoroethylene In an ethylene-lined autoclave,

[0029]Hydrothermal reaction at 240°C for 48 hours to obtain a tin dioxide / graphene / carbon liquid gel composite material. The prepared tin dioxide / graphene / carbon liquid gel composite was freeze-dried, followed by heat treatment at 1000 °C for 2 h to obtain a three-dimensional tin dioxide / graphene / carbon foam composite. The test conditions of the electrode material are as described in Example 1, charge and discharge at a current density of 100 mA / g, the first discharge capacity can reach 2000 mAh / g, and the capacity after the second cycle is still 630 mAh / g.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a stannic oxide / graphene / carbon composite material and a preparation method thereof, and belongs to the fields of electrochemistry and new energy materials. The method comprises the following steps: oxidizing graphite into a graphite oxide with an oxidant in preparation and then ultrasonically stripping the graphite oxide into a graphite oxide material; mixing a tin source and an organic carbon source with a graphite oxide solution evenly according to different ratios, and preparing a stannic oxide / graphene / carbon liquid gel composite material from the mixed solution through hydrothermal reaction, wherein the hydrothermal reaction temperature is 120-250 DEG C; and the hydrothermal reaction time is 1-48 hours; and carrying out freeze drying and heating treatment on the prepared stannic oxide / graphene / carbon liquid gel composite material to obtain a three-dimensional stannic oxide / graphene / carbon foam composite material. The material disclosed by the invention has good flexibility, is suitable for manufacturing of a flexible electrode, does not need to be added with any assistant when taken as an anode material for a lithium-ion battery, does not need to utilize a metal substrate and demonstrates good cycling stability and relatively high specific capacity.

Description

technical field [0001] The invention discloses a tin dioxide / graphene / carbon composite material and a preparation method thereof, belonging to the fields of electrochemistry and new energy materials. Background technique [0002] The demand for bendable and foldable flexible electronic devices has increased strongly in recent years, and flexible lithium-ion batteries are the core components of flexible electronic devices. Traditional lithium-ion batteries are mainly formed by mixing and coating active materials, conductive agents, and binders on metal current collectors, followed by drying and rolling. The addition of the binder reduces the electronic conductivity of the electrode material, hinders the diffusion of lithium ions in the electrode material, and increases the polarization of the electrode material. The conductive agent hardly contributes to the capacity, so the presence of the conductive agent and the binder will reduce the energy density of the battery; the me...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/583H01M4/48H01M4/1393H01M4/133H01M10/0525
CPCH01M4/133H01M4/1393H01M4/362H01M4/483H01M4/583H01M10/0525Y02E60/10
Inventor 陶华超朱守超杨学林熊凌云
Owner CHINA THREE GORGES UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com