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Germanium dioxide/graphene composite and preparation method thereof

A germanium dioxide and composite material technology, applied in secondary batteries, electrochemical generators, electrical components, etc., can solve the problems of low product purity, environmental pollution, complicated steps, etc., and achieve high purity, no environmental pollution, raw materials, etc. cheap effect

Active Publication Date: 2016-11-09
SHANGQIU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of synthesizing such materials has many problems such as cumbersome steps, many by-products, low product purity, and serious environmental pollution.

Method used

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  • Germanium dioxide/graphene composite and preparation method thereof
  • Germanium dioxide/graphene composite and preparation method thereof
  • Germanium dioxide/graphene composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of germanium dioxide / graphene composite material, the steps are as follows:

[0024] (1) Add 0.1 g of commercial germanium dioxide powder and 0.03 g of graphene oxide (GO) into 30 ml of distilled water, and magnetically stir the solution for 50 minutes, so that both germanium dioxide and graphene oxide are completely dissolved in distilled water;

[0025] (2) Transfer the obtained solution into a watch glass, put the watch glass into an electric heating constant temperature blast drying oven, keep a constant temperature of 35°C until the water evaporates completely;

[0026] (3) Calcining the black powder obtained after drying in step (2) at 300° C. for 1.5 hours in an air atmosphere, and finally obtaining a germanium dioxide / graphene composite material.

[0027] Such as figure 1 As shown, the X-ray powder diffraction of the product obtained in this example shows that the product is germanium dioxide in the hexagonal phase, corresponding to the JCP...

Embodiment 2

[0030] A preparation method of germanium dioxide / graphene composite material, the steps are as follows:

[0031] (1) Add 0.5 g of commercial germanium dioxide powder and 0.05 g of graphene oxide (GO) into 120 ml of distilled water, and magnetically stir the solution for 30 minutes, so that both germanium dioxide and graphene oxide are completely dissolved in distilled water;

[0032] (2) Transfer the obtained solution into a watch glass, put the watch glass into an electric heating constant temperature blast drying oven, and keep a constant temperature of 25°C until the water evaporates completely;

[0033] (3) Calcining the black powder obtained after drying in step (2) at 300° C. for 2.5 hours in an air atmosphere, and finally obtaining a germanium dioxide / graphene composite material. The resulting product has a purity of 100%.

[0034] The germanium dioxide / graphene composite material prepared in this example was used as the negative electrode material of lithium ion batte...

Embodiment 3

[0036] A preparation method of germanium dioxide / graphene composite material, the steps are as follows:

[0037] (1) Add 0.8 g of commercial germanium dioxide powder and 1.0 g of graphene oxide (GO) into 200 ml of distilled water, and magnetically stir the solution for 60 minutes, so that both germanium dioxide and graphene oxide are completely dissolved in distilled water;

[0038](2) Transfer the obtained solution into a watch glass, put the watch glass into an electric heating constant temperature blast drying oven, and keep a constant temperature of 40°C until the water evaporates completely;

[0039] (3) Calcining the black powder obtained after drying in step (2) at 250° C. for 1 hour in an air atmosphere, and finally obtaining a germanium dioxide / graphene composite material. The resulting product has a purity of 100%.

[0040] The germanium dioxide / graphene composite material prepared in this example was used as the negative electrode material of lithium ion battery, a...

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Abstract

The invention relates to the technical field of lithium ion battery anode materials, in particular to a germanium dioxide / graphene composite. The composite is formed by wrapping germanium dioxide submicron particles by graphene nanosheets, and the diameter of the germanium dioxide submicron particles ranges from 400 nm to 900 nm. Germanium dioxide powder and graphene oxide are dissolved in distilled water together, then water is completely evaporated at the temperature of 25 DEG C to 45 DEG C, the powder obtained after evaporation is calcined in an air atmosphere for 1-3 h at the temperature of 200 DEG C to 300 DEG C, and the composite is obtained. The prepared germanium dioxide / graphene composite is used as a lithium ion battery anode material and has high charge and discharge specific capacity, good circulating stability and fast charge and discharge performance, the preparation method is simple, pollution is avoided, the reaction temperature is low, the obtained product is high in purity, and no by-product is generated.

Description

technical field [0001] The invention belongs to the technical field of inorganic energy storage materials, and relates to lithium ion battery negative electrode materials, in particular to a germanium dioxide / graphene composite material and a preparation method thereof. Background technique [0002] With the advantages of high capacity, long cycle life, low self-discharge rate and no memory effect, lithium-ion batteries have become one of the most advanced secondary chemical energy storage devices. However, in order to meet the requirements of a new generation of green large vehicles such as electric vehicles and hybrid vehicles, its performance still needs to be further improved. [0003] Electrodes are the core components of lithium-ion batteries, and electrode materials are the key factors that determine the performance of lithium-ion batteries. Traditional graphite anode materials have the problems of low specific capacity (theoretical capacity is 372 mAh / g), poor lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 魏伟贾方方王科峰瞿鹏徐茂田
Owner SHANGQIU NORMAL UNIVERSITY
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