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Preparation for interconnected nanowire core-shell structure material

A core-shell structure and structural material technology, applied in nanotechnology, structural parts, electrical components, etc., can solve the problems of destroying electrode structure, electrical contact deterioration, material crushing, etc., to reduce diffusion resistance, good conductivity, high The effect of utilization

Inactive Publication Date: 2015-11-11
NANJING UNIV
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Problems solved by technology

[0003] However, due to the continuous intercalation and extraction of lithium ions during the lithiation cycle, the volume expansion of Si(Ge) exceeds 400% (300%), resulting in material crushing and even fracture, destroying the electrode structure and making its electrical contact worse. capacity drop

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  • Preparation for interconnected nanowire core-shell structure material

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Embodiment Construction

[0018] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following in conjunction with specific examples, and with reference to the appended figure 1 , to further describe the present invention in detail.

[0019] 1) Use a three-dimensional porous copper foam with a thickness of 0.5mm as the current collector (such as a), and clean the surface normally, soak it with hydrochloric acid to remove the oxide layer, and then dry it with a nitrogen gun.

[0020] 2) Using a CVD furnace and calcining in the atmosphere, CuO nanowires with a diameter of about 30nm and a length of 7-10um can be prepared on the three-dimensional copper foam.

[0021] 3) Depositing amorphous Si(Ge) for 30 minutes by PECVD under the conditions of power 20W and temperature 250°C, an interconnected core-shell nanowire structure with a diameter of about 100nm can be obtained.

[0022] 4) Use H 2 , reduce the core CuO in PECVD (atmospheric pressure 200Pa, fl...

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Abstract

The invention discloses a preparation method for an interconnected nanowire core-shell structure material. The preparation method comprises the following steps of: 1) taking a foamy copper sheet with thickness of 0.2-0.5 millimeter as a substrate; 2) cleaning the surface of foamy copper by using an ordinary cleaning method, immersing the foamy copper in hydrochloric acid to remove an oxide, and then drying by using a nitrogen pistol; 3) calcining for 5 hours at 450 DEG C in air, leading the foamy copper to self-catalytically grow a CuO nanowire or other metal oxide nanowire with diameter of about 30 nanometers and length of 7-10 micrometers; 4) depositing amorphous Si(Ge) at 250 DEG C through plasma enhanced chemical vapor deposition (PECVD) to obtain an interconnected nanowire core-shell structure with diameter of about 100-200 nanometers, namely a Si(Ge) shell and a CuO core; 5) reducing the CuO core by using H2 at 400 DEG C to obtain a high-conductivity metallic Cu nanowire, and completing the building of a three-dimensional current collector; and 6) preparing and completing the three-dimensional interconnected metallic nanowire conductive core structure material.

Description

technical field [0001] The invention relates to an interconnected nanowire core-shell structure used for lithium-ion battery anode materials, in particular to a nanowire core-shell structure in which Cu metal nanowires are coated with amorphous Si (Ge) to realize interconnection. technical background [0002] As the application range of lithium batteries gradually expands to high-power and high-current electric equipment such as electric vehicles, the traditional theoretical reversible specific capacity of 372mAh / g graphite material has been difficult to meet people's requirements for lithium storage capacity and power. Electrode materials with high energy density, high energy density and high cycle stability have become an inevitable trend in the development of next-generation lithium batteries. Among many materials, Si(Ge) material has become the most promising next-generation lithium battery anode material because of its abundant content, easy acquisition, and specific ca...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525B82Y40/00
CPCH01M4/62B82Y40/00H01M10/0525Y02E60/10
Inventor 余林蔚王鸿祥宋虎成徐骏
Owner NANJING UNIV
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