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A kind of preparation method of ge/c composite nanofiber

A technology of composite nanofibers and mixed liquids, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficulty in synthesizing Ge nanoparticles, destroying carbon fiber structure, etc., to achieve High rate performance, improved electronic conductivity, and easy operation

Active Publication Date: 2020-06-02
SHANGQIU NORMAL UNIVERSITY
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Problems solved by technology

[0006] Second, the size of Ge nanoparticles should be strictly limited, because too large Ge particles are more likely to agglomerate, and their drastic volume changes will destroy the structure of carbon fibers;
[0008] However, it is still difficult to satisfy these conditions at the same time, especially the synthesis of Ge nanoparticles below 10nm is very difficult.

Method used

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  • A kind of preparation method of ge/c composite nanofiber
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  • A kind of preparation method of ge/c composite nanofiber

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preparation example Construction

[0033] The specific embodiment of the present invention provides a kind of preparation method of Ge / C composite nanofiber, and this preparation method comprises the following steps:

[0034] 1) Add 0.4~1.0g (such as 0.5g, 0.6g, 0.7g, 0.8g, 0.9g) of polyacrylonitrile to 5~10ml (such as 6ml, 7ml, 8ml, 9ml) of N, N dimethyl In formamide, mix and stir evenly until polyacrylonitrile is completely dissolved in N,N dimethylformamide to obtain a mixed solution;

[0035] 2) Add 0.2-1.5ml (eg 0.3ml, 0.5ml, 0.7ml, 0.8ml, 0.9ml, 1.0ml, 1.1ml, 1.2ml, 1.3ml, 1.4ml) of germanium isopropoxide into step 1) In the obtained mixed solution, stir evenly for 2-4 hours (for example, 2.5 hours, 3 hours, 3.5 hours, 3.8 hours) to obtain a precursor solution.

[0036] 3) Transfer the precursor solution obtained in step 2) to a plastic syringe with a needle inner diameter of 0.9 mm; and set the flow rate with a precision propeller, and place a piece of aluminum foil at a distance of 15 cm from the plast...

Embodiment 1

[0039] A kind of preparation method of Ge / C composite nanofiber, this preparation method comprises the steps:

[0040] 1) Add 0.6g of polyacrylonitrile (molecular weight 150000, Aldrich reagent) to 5ml of N,N dimethylformamide (DMF, Aladdin's reagent), mix and stir until the polyacrylonitrile is completely dissolved to N, In N-dimethylformamide, a mixed solution was obtained;

[0041] 2) Add 1 ml of germanium isopropoxide (Alpha Aesar reagent) solution to the mixed solution obtained in step 1), and stir evenly for 3 hours to obtain a precursor solution.

[0042] 3) Transfer the precursor solution obtained in step 2) to a plastic syringe with a needle inner diameter of 0.9 mm; and set the flow rate with a precision propeller, and place a piece of aluminum foil at a distance of 15 cm from the plastic syringe to collect Nanofiber membrane precursor; wherein, the flow rate set by the precision propeller is 0.2ml min -1 The spinning voltage is set to 15kV; the experimental proces...

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Abstract

The invention provides a preparation method of a Ge / C composite nanofiber. The Ge / C composite nanofiber is synthesized by polyacrylonitrile as a polymer, N,N-dimethylformamide as a solvent and germanium isopropoxide as a germanium source by adopting an electrospinning method. The synthesized Ge / C composite nanofiber has the characteristics that Ge nanoparticles of which the diameters are 4-7nm arehighly dispersed into a carbon fiber and the carbon fiber has a porous structure. The Ge / C composite nanofiber has excellent electrochemical properties as a negative electrode material for a lithium-ion battery. The preparation method is simple and easy to operate. The Ge / C composite nanofiber is synthesized through the simple and feasible electrospinning method.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of Ge / C composite nanofibers. Background technique [0002] Germanium is a very potential anode material for future high-performance lithium-ion batteries, it has a capacity of up to 1600mAhg -1 Theoretical capacity, lithium ion diffusion rate 400 times higher than silicon, and electronic conductivity 10,000 times higher than silicon. These characteristics make germanium have the advantages as a high-performance lithium-ion battery anode material. However, in the case of sufficient lithium intercalation, the volume of Ge expands to 370% of its original volume, which leads to the pulverization of the electrode and the rapid fading of the capacity because of the unavoidable formation of Ge particles during the charge-discharge cycle. Agglomeration, cycling performance and high-rate discharge performance of most Ge nanostructures are st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/38H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 贾方方于丽敏王军梅瞿鹏徐茂田
Owner SHANGQIU NORMAL UNIVERSITY
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