Amorphous germanium dioxide/multi-tube carbon nanofiber and preparation method thereof

A technology of germanium dioxide and nanofibers, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low conductivity, unfavorable electron transmission, low and high current density capacity, poor rate performance, etc. problem, to achieve the effect of avoiding thickening phenomenon, improving cycle performance and improving rate performance

Active Publication Date: 2017-12-15
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low conductivity of germanium dioxide is not conducive to electron transport, which makes it have poor rate performance and low high current density capacity when used as an electrode material; on the other hand, with the intercalation / extraction of lithium ions, germanium dioxide will still Produce volume expansion / contraction, causing it to pulverize and fall off

Method used

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  • Amorphous germanium dioxide/multi-tube carbon nanofiber and preparation method thereof
  • Amorphous germanium dioxide/multi-tube carbon nanofiber and preparation method thereof
  • Amorphous germanium dioxide/multi-tube carbon nanofiber and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 2g of germanium dioxide powder with an electronic balance, and put it into a ball mill jar together with 50g of small balls with diameters ranging from 10 to 15mm for ball milling. The mass ratio of balls to materials is 25:1. The rotating speed of the ball milling tank was 300 rpm, and the ball milling was performed for 2 hours to obtain germanium dioxide nanoparticles.

[0034] (2) Weigh 0.16g of polystyrene and 0.8g of polyacrylonitrile with an electronic balance, place them in a 20ml sample bottle, and inject 9.2g of N-N dimethylformamide. Then accurately weigh 0.8 g of germanium dioxide nanometer powder and place it in the above-mentioned sample bottle, seal the sample bottle with a parafilm, heat to 60° C. and stir for 24 hours.

[0035] (3) Aluminum foil paper with a cut area of ​​40cm×40cm is attached to the flat collector, put 5 ml of spinning solution sample into the injection needle, connect the positive electrode of the high-voltage generator to th...

Embodiment 2

[0038] (1) Weigh 2g of germanium dioxide powder with an electronic balance, and put it into a ball mill jar together with 50g of small balls with diameters ranging from 5 to 15mm for ball milling. The mass ratio of balls to materials is 25:1. The rotating speed of the ball milling tank was 400 rpm, and the ball milling was performed for 3 hours to obtain germanium dioxide nanoparticles.

[0039](2) Weigh 0.24g of polystyrene and 0.8g of polyacrylonitrile with an electronic balance, place them in a 20ml sample bottle, and inject 9.2g of N-N dimethylformamide. Then accurately weigh 0.8 g of germanium dioxide nanometer powder and place it in the above-mentioned sample bottle, seal the sample bottle with a parafilm, heat to 60° C. and stir for 24 hours.

[0040] (3) Aluminum foil paper with a cut area of ​​40cm×40cm is attached to the flat collector, put 5 ml of spinning solution sample into the injection needle, connect the positive electrode of the high-voltage generator to the ...

Embodiment 3

[0043] (1) Weigh 2g of germanium dioxide powder with an electronic balance, and put it into a ball mill jar together with 50g of small balls with diameters ranging from 10 to 15mm for ball milling. The mass ratio of balls to materials is 25:1. The rotating speed of the ball milling tank was 300 rpm, and the ball milling was performed for 2 hours to obtain germanium dioxide nanoparticles.

[0044] (2) Weigh 0.48g of polystyrene and 0.8g of polyacrylonitrile with an electronic balance, place them in a 20ml sample bottle, and inject 9.2g of N-N dimethylformamide. Then accurately weigh 0.8 g of germanium dioxide nanometer powder and place it in the above-mentioned sample bottle, seal the sample bottle with a parafilm, heat to 60° C. and stir for 24 hours.

[0045] (3) Aluminum foil paper with a cut area of ​​40cm×40cm is attached to the flat collector, put 5 ml of spinning solution sample into the injection needle, connect the positive electrode of the high-voltage generator to th...

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Abstract

The invention relates to the field of lithium ion battery anode materials, in particular to an amorphous germanium dioxide / multi-tube carbon nanofiber and a preparation method thereof. The amorphous germanium dioxide / multi-tube carbon nanofiber comprises a tube carbon nanofiber and amorphous germanium dioxide positioned on the multi-tube carbon nanofiber, wherein the mass percentage content of the germanium dioxide is 10%-60%. The amorphous germanium dioxide / multi-tube carbon nanofiber prepared with the method is beneficial to improvement of the capacity and cycle performance of a lithium ion battery, and the method is simple, controllable and easy to operate.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to an amorphous germanium dioxide / multi-pipe carbon nanofiber and a preparation method thereof. Background technique [0002] As a secondary battery, lithium-ion batteries mainly rely on the movement of lithium ions between the positive and negative electrodes. During the charge and discharge process, lithium ions travel back and forth between the two electrodes to deintercalate the positive and negative electrodes. Nowadays, the rapid development of electronic equipment and electric vehicles has put forward higher requirements for the specific capacity, cycle performance and rate performance of lithium-ion batteries. Graphite, the most commonly used commercial anode material, has a lower theoretical capacity, resulting in a lower capacity for lithium-ion batteries. [0003] Germanium, a group IVA element, has a high lithium intercalation capac...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/485H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 胡毅何霞吴克识程钟灵潘鹏汤忠旸
Owner ZHEJIANG SCI-TECH UNIV
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