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Nanocomposite loading carbon-coated SnO2 nano particles on graphene sheets and preparation method of nanocomposite

A nanocomposite material and nanoparticle technology, which is applied in the field of lithium battery anode materials with high energy storage density and cycle stability and its preparation, can solve problems such as weak charge conduction ability, and achieve easy mass production, good industrial production basis, The effect of simple preparation conditions

Inactive Publication Date: 2016-10-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it also has the disadvantage of weaker charge conductivity than graphene-based composites.

Method used

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  • Nanocomposite loading carbon-coated SnO2 nano particles on graphene sheets and preparation method of nanocomposite
  • Nanocomposite loading carbon-coated SnO2 nano particles on graphene sheets and preparation method of nanocomposite
  • Nanocomposite loading carbon-coated SnO2 nano particles on graphene sheets and preparation method of nanocomposite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The graphene oxide (GO) prepared by redox method was dispersed in acetone to obtain the solvent dispersion of GO, and the concentration of GO was 2 mg / ml;

[0029] (2) Weigh 0.07 g of ferrocene and ultrasonically dissolve it in 5 ml of acetone, then add 5 ml of the GO dispersion prepared in step (1), sonicate for 30 min to disperse evenly, and then add 0.35 ml of hydrogen peroxide;

[0030] (3) Transfer the mixed liquid obtained in step (2) to an autoclave, and place it in an oven at 210°C for 12 h; after cooling down to room temperature naturally, take out the liquid and wash it by centrifugation with absolute ethanol for 3 times; then The reactant was dried in an oven at 60°C for 12 h;

[0031] (4) Take 0.5 g of the dried powder and place it in a tube furnace, heat it up to 500 °C under the protection of nitrogen, and keep it for 2 h to obtain the final nanocomposite material, which is denoted as graphene@Fe 3 o 4 @C;

[0032] (5) Weigh 0.25 g graphene@Fe 3 o4...

Embodiment 2

[0036] (1) The graphene oxide (GO) prepared by redox method was dispersed in acetone to obtain the solvent dispersion of GO, and the concentration of GO was 2 mg / ml;

[0037] (2) Weigh 0.07 g of ferrocene and ultrasonically dissolve it in 5 ml of acetone, then add 5 ml of the GO dispersion prepared in step (1), and ultrasonically disperse evenly for 30 min without adding hydrogen peroxide;

[0038] (3) Transfer the mixed liquid obtained in step (2) to an autoclave, and place it in an oven at 210°C for 12 h; after cooling down to room temperature naturally, take out the liquid and wash it by centrifugation with absolute ethanol for 3 times; then The reactant was dried in an oven at 60°C for 12 h;

[0039] (4) Take 0.5 g of the dried powder and place it in a tube furnace, heat it up to 500 °C under the protection of nitrogen, and keep it for 2 h to obtain the final nanocomposite material, which is denoted as graphene@Fe 3 o 4 @C;

[0040] (5) Weigh 0.25 g graphene@Fe 3 o 4 ...

Embodiment 3

[0044] (1) The graphene oxide (GO) prepared by redox method was dispersed in acetone to obtain the solvent dispersion of GO, and the concentration of GO was 2 mg / ml;

[0045] (2) Weigh 0.05 g of ferrocene and ultrasonically dissolve it in 5 ml of acetone, then add 5 ml of the GO dispersion prepared in step (1), sonicate for 30 min to disperse evenly, and then add 0.25 ml of hydrogen peroxide;

[0046] (3) Transfer the mixed liquid obtained in step (2) to an autoclave, and place it in an oven at 210°C for 12 h; after cooling down to room temperature naturally, take out the liquid and wash it by centrifugation with absolute ethanol for 3 times; then The reactant was dried in an oven at 60°C for 12 h;

[0047] (4) Take 0.5 g of the dried powder and place it in a tube furnace, heat it up to 500 °C under the protection of nitrogen, and keep it for 2 h to obtain the final nanocomposite material, which is denoted as graphene@Fe 3 o 4 @C;

[0048] (5) Weigh 0.25 g graphene@Fe 3 o ...

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Abstract

The invention belongs to the technical field of lithium battery materials, in particular to a nanocomposite loading carbon-coated SnO2 nano particles on graphene sheets and a preparation method of the nanocomposite. Firstly a composite loading carbon-coated iron oxide on grapheme is obtained through a solvothermal reaction between ferrocene and graphene oxide, then ferric oxide nano particles in the composite are etched through acid to obtain carbon nanofoam with plenty of mesoporous structures, and then through precursor hydrolysis, mesopores are filled with SnO2 nano particles. The obtained material has very excellent lithium ion storage performance, outstanding cycling stability and excellent rate performance when being used as an anode material of a lithium battery. The method is simple to operate, relatively low in production cost and easy for batch and large-scale production, and has good industrial production bases and wide application prospects.

Description

technical field [0001] The invention belongs to the field of energy storage materials, in particular to a lithium battery negative electrode material with high energy storage density and cycle stability and a preparation method thereof. Background technique [0002] The rapid growth of population and industry has led to an ever-increasing demand for energy. Therefore, how to efficiently store energy has received extensive attention and research. Lithium batteries have been widely used as driving power sources for portable electronic devices, electric vehicles, and smart grids due to their high energy storage density, long service life, and low self-discharge characteristics. However, the theoretical capacity of the current commercial lithium battery anode material graphite is only 372 mAh g -1 , and the rate performance is also poor, it is difficult to meet the requirements of large-capacity and high-safety batteries for future electric vehicles. Therefore, it is of great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/48H01M4/62B82Y30/00H01M10/0525
CPCB82Y30/00H01M4/362H01M4/48H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 王雄伟武培怡
Owner FUDAN UNIV
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