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Germanium-graphene composite cathode material for lithium ion battery and preparation method thereof

A graphene composite and lithium-ion battery technology, applied in battery electrodes, circuits, electrolytes, etc., can solve the problems of difficult large-scale industrialization and high energy consumption, and achieve the effects of sufficient conductivity, low energy consumption, and high rate

Inactive Publication Date: 2015-03-25
东莞市翔丰华电池材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 103247803 A discloses a graphene-coated nano-germanium composite material and its preparation method and application. It is prepared by dielectric barrier discharge plasma-assisted high-energy ball milling. Although this method is simple in process, it consumes a lot of energy and is difficult to industrialize on a large scale

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  • Germanium-graphene composite cathode material for lithium ion battery and preparation method thereof
  • Germanium-graphene composite cathode material for lithium ion battery and preparation method thereof

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preparation example Construction

[0020] The preparation method of the lithium-ion battery germanium-graphene composite negative electrode material is as follows: comprising the following steps:

[0021] (1) Stir to disperse

[0022] 20-80 parts by weight of germanium powder, 20-80 parts by weight of germanium dioxide powder, 1-20 parts by weight of graphene powder and 100-1000 parts by weight of distilled water were ultrasonically stirred in a mixer for 5-30 minutes. In this embodiment , the purity of the germanium powder and germanium dioxide powder is above 99.99%, and the graphene is obtained by redox method, mechanical exfoliation method, epitaxial growth method, chemical vapor deposition method, electrochemical method or arc method.

[0023] (2) Microwave water heating

[0024] The liquid obtained in step (1) is transferred into a hydrothermal reaction kettle with a Teflon lining, and treated in a microwave hydrothermal reaction apparatus at 100-300° C. for 10-100 minutes.

[0025] (3) Wash and dry col...

Embodiment 1

[0029] (1) Stir to disperse

[0030] 20 parts by weight of germanium powder, 70 parts by weight of germanium dioxide powder, 10 parts by weight of graphene powder and 500 parts by weight of distilled water were ultrasonically stirred in a stirrer for 5 minutes.

[0031] (2) Microwave water heating

[0032] The liquid obtained in step (1) was transferred to a hydrothermal reaction kettle with a Teflon lining, and treated in a microwave hydrothermal reaction apparatus at 100°C for 10 minutes.

[0033] (3) Wash and dry collection

[0034] The product obtained in step (2) was collected by filtration, washed twice with deionized water and ethanol, and then dried at 80 °C for 5 h in a desiccator to obtain a germanium-graphene composite negative electrode material.

Embodiment 2

[0036] (1) Stir to disperse

[0037] 32 parts by weight of germanium powder, 69 parts by weight of germanium dioxide powder, 15 parts by weight of graphene powder and 600 parts by weight of distilled water were ultrasonically stirred in a stirrer for 10 minutes.

[0038] (2) Microwave water heating

[0039] The liquid obtained in step (1) was transferred to a hydrothermal reactor with a Teflon lining, and treated in a microwave hydrothermal reactor at 120°C for 30 minutes.

[0040] (3) Wash and dry collection

[0041] The product obtained in step (2) was collected by filtration, washed repeatedly with deionized water and ethanol three times, and then dried in a desiccator at 50°C for 6 h to obtain a germanium-graphene composite negative electrode material.

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Abstract

The invention discloses a germanium-graphene composite cathode material for a lithium ion battery and a preparation method of the germanium-graphene composite cathode material. The composite cathode material is prepared from germanium particles and grapheme through compounding, wherein the nano germanium particles are uniformly distributed in a grapheme sheet layer to form a grapheme network cladded three-dimensional net structure. The preparation method comprises the following steps: (1) stirring and dispersing; (2) carrying out microwave hydrothermal; and (3) washing, drying and collecting. According to the germanium-graphene composite cathode material for the lithium ion battery and the preparation method of the germanium-graphene composite cathode material, germanium and germanium dioxide are re-crystallized and grow on the graphene in situ, the bonding strength of the germanium and the grapheme is higher than that of germanium-graphene composite material obtained through mixing simply, the electrical conductivity of the grapheme network is fully exerted, and the volume effect of the germanium is effectively inhibited. The germanium-graphene composite cathode material for the lithium ion battery has the characteristics of high capacity, high magnification and excellent cycling stability, the preparation process adopts simple and effective microwave hydrothermal reaction, the process is simple, the energy consumption is low, the yield is high, no pollution is caused, the germanium-graphene composite cathode material can be promoted and applied conveniently and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technology in the field of battery negative electrode materials, in particular to a lithium-ion battery germanium-graphene composite negative electrode material and a preparation method thereof. Background technique [0002] At present, a large number of commercial lithium-ion batteries use graphite-based carbon materials as negative electrode materials. Due to the low mass specific capacity of graphite-based carbon materials (the theoretical value is 372mAh / g, the actual capacity is 330-360mAh / g) and relatively low Poor high-rate charge and discharge performance limits the improvement of lithium-ion battery capacity. In order to meet the future demand for high-capacity and long-life lithium-ion batteries for civil, industrial or national defense, researchers are constantly exploring other high-capacity carbon alternative materials, such as metals and alloy materials. Among them, the theoretical specific capacity of metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/133H01M4/1393H01M4/1395
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/364H01M4/38H01M4/587H01M4/625H01M2300/0091Y02E60/10
Inventor 宋宏芳赵东辉戴涛周鹏伟
Owner 东莞市翔丰华电池材料有限公司
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