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A kind of graphene-coated nano-germanium composite material and its preparation method and application

A graphene coating, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as inability to industrialize mass production, cumbersome process parameters, complex synthesis process, etc. The preparation method is simple, the cycle stability is good, and the preparation process is simple.

Active Publication Date: 2017-02-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis process of the composite material published in the current literature is complicated. It is generally obtained by chemically reducing graphene oxide and then further reacting with germanium compounds. The amount of synthesis is very small and the control of process parameters is cumbersome, so it cannot be mass-produced industrially.

Method used

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  • A kind of graphene-coated nano-germanium composite material and its preparation method and application
  • A kind of graphene-coated nano-germanium composite material and its preparation method and application
  • A kind of graphene-coated nano-germanium composite material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The specific steps of the dielectric barrier discharge plasma-assisted high-energy ball milling method are:

[0048] (1) Install the front cover and the electrode rod of the ball mill, and connect the iron core in the front cover and the electrode rod to the positive and negative stages of the plasma power supply respectively, wherein the iron core in the electrode rod is connected to the plasma power supply The positive pole of the front cover is connected to the negative pole of the plasma power supply;

[0049] (2) Put cemented carbide grinding balls (different in size) and original powder with a good ratio in the ball mill tank (ball powder ratio 50:1);

[0050] (3) Vacuum the ball mill tank through the vacuum valve, and then fill the discharge gas medium Ar gas, so that the pressure value in the ball mill tank reaches 0.12MPa;

[0051] (4) Turn on the plasma power supply, set the plasma power supply voltage to 15KV, the current to 1.5A, and the discharge frequency...

Embodiment 2

[0057] The difference between this embodiment and embodiment 1 is:

[0058] The mixing and ball milling time of the germanium raw material and the expandable graphite is 5 hours. The above-mentioned powders were made into negative electrode sheets of lithium-ion batteries, and the batteries were assembled for charge and discharge tests.

Embodiment 3

[0060] The difference between this embodiment and embodiment 1 is:

[0061] The germanium raw material and the expandable graphite are mixed and ball-milled for 10 hours. And the above-mentioned powder is made into the negative electrode sheet of the lithium ion battery, and after the battery is assembled, the charge and discharge test is carried out under the condition of 0.2C charge and discharge rate. Its initial discharge capacity is 1313mAhg -1 , the capacity remains at 845mAhg after 40 cycles -1 .

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Abstract

The invention discloses a preparation method of a graphene-cladding nano germanium composite material. The preparation method is characterized in that germanium powder and graphite powder or the expanded graphite after being thermally treated are ball-milled by adopting a dielectric barrier discharge plasma assistant high-energy ball milling method; or the germanium powder is firstly under the dielectric barrier discharge plasma assistant high-energy ball milling, and the ball-milled germanium powder is mixed with the graphite powder or the expanded graphite after being thermally treated to be ball-milled by adopting the dielectric barrier discharge plasma assistant high-energy ball milling method. The structure of the composite material prepared through the technological steps is that the nano germanium particles are uniformly coated by a single layer or multiple layers of graphene networks; and due to the high capacity and excellent lithium-ion dispersion speed of the germanium and the high strength, high specific area, high conductivity and the like of the graphene, when being used as a negative electrode material of the lithium-ion battery, the composite material has high capacity, high multiplying factor and excellent cycling performance. The preparation method is simple in process, little in energy consumption, high in yield and environment-friendly.

Description

technical field [0001] The invention relates to lithium-ion battery negative electrode materials and other nano-functional materials that require a graphene-coated structure, specifically refers to a graphene-coated nano-germanium composite material and its one-step preparation method and application, and belongs to the technical field of new energy and nano-functional materials. Background technique [0002] Graphene, as single-layer or thin-layer graphite, has a large specific surface area, high specific strength, excellent conductivity and other outstanding properties, making it widely used in lithium-ion batteries, solar energy, supercapacitors, semiconductors, nanoelectronic devices, High-strength materials and new noise reduction and heat dissipation have great application space. However, most of its preparation and synthesis processes are in the laboratory stage or very small batch production, and the process of large-scale production of graphene or its composite mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 欧阳柳章郭丽娜胡仁宗刘辉曾美琴杨黎春朱敏
Owner SOUTH CHINA UNIV OF TECH
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