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Germanium-carbon-graphene composite material, and preparation method and application thereof

A composite material, graphene technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of unsuitable industrial application, high cost, insignificant effect, etc., and achieve excellent cycle stability, high output, and low energy consumption. Effect

Active Publication Date: 2013-08-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among many strategies, the effect of simple nanonization or alloying is not significant and the cost is high, which is not suitable for industrial applications

Method used

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  • Germanium-carbon-graphene composite material, and preparation method and application thereof
  • Germanium-carbon-graphene composite material, and preparation method and application thereof
  • Germanium-carbon-graphene composite material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The preparation method of the germanium-carbon graphene composite material of the present embodiment may further comprise the steps:

[0030] (1) Use a high-energy pendulum vibration ball mill (QC-3M) to mill pure germanium raw materials and graphite raw materials in an oxidizing atmosphere. During the process of nanonization, a small amount of germanium dioxide shells are formed on the surface of germanium. Among them, pure germanium raw materials and graphite raw materials The mass ratio of raw materials is 1:1; the mass ratio of grinding balls to raw material powder is 20:1, and the ball milling time is 10h. The obtained GeGeO 2 C composite material, its surface morphology is as follows figure 1 shown;

[0031] (2) Graphite oxide was prepared by the improved Hummers method, and reduced graphene oxide was obtained by reduction with hydrazine hydrate. The surface morphology is as follows figure 2 shown;

[0032] (3) The germanium-carbon composite core-shell materia...

Embodiment 2

[0038] The preparation method of the germanium-carbon graphene composite material of the present embodiment, except that the mass ratio of pure germanium raw material and graphite raw material is 1:0.1, GeGeO 2 Except that the mass ratio of C composite material and reduced graphene oxide is 1:0.8, all the other features are the same as in Example 1.

[0039] GeGeO prepared in this embodiment 2 The surface morphology of C / RGO composites is as follows: Image 6 shown.

[0040] The germanium-carbon-graphene composite material prepared in this example was made into a negative electrode sheet of a lithium-ion battery, and after the battery was assembled, a charge-discharge test was performed under 2C charge-discharge rate conditions. Prepared GeGeO 2 The initial discharge capacity of C / RGO composite is 1060mAhg -1 , the capacity remains at 413mAhg after 100 cycles -1 .

Embodiment 3

[0042] The preparation method of the germanium-carbon-graphene composite material of this embodiment is the same as that of Embodiment 1, except that the mass ratio of pure germanium raw material and graphite raw material is 1:0.5, and the ball milling time is 4h.

[0043] The germanium-carbon graphene composite material prepared in this example is made into the negative electrode sheet of lithium-ion battery, and after the battery is assembled, the charge-discharge test is carried out under the condition of 2C charge-discharge rate. The rate cycle performance curve is as follows: Figure 7 As shown, it can be seen that the first discharge capacity is 1841mAhg -1 , the capacity remains at 575mAhg after 100 cycles -1 .

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PUM

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Abstract

The invention discloses a germanium-carbon-graphene composite material which is compounded from nano germanium. germanium dioxide, flocculent carbon and reduction-oxidation graphene, wherein the germanium dioxide is coated on the surface layer of the germanium to form a core shell, thereby forming nano core-shell particles; and the nano core-shell particles are uniformly dispersed and distributed in the flocculent carbon, and coated by the reduction-oxidation graphene network. The invention also discloses a preparation method and application of the germanium-carbon-graphene composite material. The germanium-carbon-graphene composite material disclosed by the invention has the characteristics of high capacity, high ratio and high loop stability, and has the advantages of simple preparation technique, low energy consumption, high yield and no pollution.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery, in particular to a germanium-carbon graphene composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have important strategic significance in the field of new energy, and are a hot technology for economic development and government support at the current stage. The selection of the negative electrode material system and its performance are one of the key factors determining the performance of the new generation of lithium-ion batteries. The capacity of traditional commercial carbon anode materials has reached the limit, and the fundamental problem is that the theoretical capacity of carbon materials is low (372mAhg -1 ). Among the many non-carbon anode material systems that have been studied, the metal Ge system as the anode material of lithium ion batteries not only has high capacity, but also has a large ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 欧阳柳章郭丽娜胡仁宗蔡伟华叶建山朱敏
Owner SOUTH CHINA UNIV OF TECH
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