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Orderly-arranged silicon-filled carbon nanotube material and preparation method and use thereof

A technology of carbon nanotubes and orderly arrangement, which is applied in the field of silicon-filled carbon nanotube materials and preparation, and can solve the problems of battery cycle performance degradation, separation of electrode active materials and current collectors, and structural collapse.

Active Publication Date: 2018-03-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the silicon material also has a big problem at the same time: one is that the volume expansion of the Si negative electrode in the charged state can reach 300%, and the mechanical force generated will gradually pulverize the material, causing the structure to collapse, and eventually lead to the active material of the electrode and the current collector. Detachment, loss of electrical contact, resulting in greatly reduced battery cycle performance
However, the disadvantage is that the interface contact between the silicon material and the carbon material is poor, and it is difficult to completely and uniformly coat the inner wall of the nanoscale pores of the silicon material.

Method used

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  • Orderly-arranged silicon-filled carbon nanotube material and preparation method and use thereof
  • Orderly-arranged silicon-filled carbon nanotube material and preparation method and use thereof
  • Orderly-arranged silicon-filled carbon nanotube material and preparation method and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Immerse 100 g of anodized aluminum template with holes at both ends in 150 mL of a cyclohexane solution of polypyrrole with a mass fraction of 0.02 g / mL for 1 h, filter, and then wash the filter residue with cyclohexane solvent and ethanol, and bake at 50 °C. After drying for 10 hours, the dried anodized alumina template was placed in a high-temperature furnace in an argon atmosphere, and kept at 800° C. for 2 hours to obtain ordered carbon nanotubes with alumina template. Dissolve 21 g of silicon tetrachloride in 100 mL of anhydrous ethane, add the ordered carbon nanotubes with alumina template into the anhydrous ethane solution of silicon tetrachloride, soak for 2 h, and then use anhydrous ethane, Ethanol was used to clean the residual silicon tetrachloride on the surface of the alumina template, and then 4.7 g of sodium borohydride was slowly added dropwise from one end of the ordered carbon nanotubes, so that the sodium borohydride solution gradually penetrated throu...

Embodiment 2

[0051] 100 g of anodized aluminum template with openings at both ends was immersed in 150 mL of a polyacrylonitrile n-octane solution with a mass fraction of 0.05 g / mL for 0.5 h, filtered, and then the filter residue was washed with cyclohexane solvent and ethanol. After drying at ℃ for 2 h, the dried anodized alumina template was placed in a high-temperature furnace with nitrogen atmosphere, and kept at 700 ℃ for 3 h to obtain ordered carbon nanotubes with alumina template. Dissolve 10.5 g of silicon tetrachloride in 100 mL of anhydrous ethane, and add the ordered carbon nanotubes with alumina template into the anhydrous ethane solution of silicon tetrachloride, soak for 4 h, and then use anhydrous ethane , ethanol to clean the residual silicon tetrachloride on the surface of the alumina template, and then slowly drop 2.0 g of hydrazine hydrate from one end of the ordered carbon nanotubes, so that the hydrazine hydrate solution gradually penetrates through the carbon nanotube ...

Embodiment 3

[0053] 100 g of anodized aluminum template with openings at both ends was immersed in 150 mL of a cyclohexane solution of polystyrene with a mass fraction of 0.1 g / mL for 2 h, filtered, and then the filter residue was washed with cyclohexane solvent and ethanol, at 70 °C After drying for 8 hours, the dried anodized alumina template was placed in a high-temperature furnace in an argon atmosphere, and kept at 750° C. for 4 hours to obtain ordered carbon nanotubes with alumina template. Dissolve 210 g of silicon tetrachloride in 100 mL of anhydrous ethane, add the ordered carbon nanotubes with alumina template into the anhydrous ethane solution of silicon tetrachloride, soak for 6 h, and then use anhydrous ethane, Ethanol was used to clean the residual silicon tetrachloride on the surface of the alumina template, and then 42.5g of hydrogen peroxide was slowly added dropwise from one end of the ordered carbon nanotubes, so that the hydrogen peroxide solution gradually penetrated th...

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Abstract

The invention provides an orderly-arranged silicon-filled carbon nanotube material and a preparation method and a use thereof. The orderly-arranged silicon-filled carbon nanotube material is a material of a core-shell structure; the material of the core-shell structure is formed by filling the carbon nanotube material with a silicon material; the carbon nanotube material is in a carbon nanotube array formed by multiple carbon nanotubes in ordered bunch-shaped arrangement; the two ends of the carbon nanotube material are sealed by carbon; and the carbon nanotube material has the composition ofC<x> / (SiO<y>)<z> / CNT, wherein x is greater than 0.01 and less than or equal to 0.1, y is greater than or equal to 0 and less than or equal to 2, and z is greater than 0 and less than or equal to 1. The orderly-arranged silicon-filled carbon nanotube material provided by the invention has high conductivity, so that a flexible electrode can be prepared conveniently; and when the orderly-arranged silicon-filled carbon nanotube material is applied to the negative electrode of a lithium battery, the interior of the carbon nanotubes is coated with the silicon material, and the silicon material is isolated from an external electrolyte, so that electrolyte consumption caused by constant reaction between the material and the electrolyte can be avoided.

Description

technical field [0001] The invention belongs to the technical field of carbon nanotube materials, and relates to a silicon-filled carbon nanotube material arranged in an orderly manner, and a preparation method and application thereof. Background technique [0002] With the rapid development of electric vehicles, lithium-ion battery materials have become more and more widely used. The longer cruising range of electric vehicles has higher energy density requirements for lithium-ion batteries. The theoretical specific capacity of graphite-based negative electrodes is only 372mAh / g, it has been unable to meet the requirements of high specific energy density of today's lithium-ion batteries, and further breakthroughs in energy density require the application of silicon-based anode materials with higher specific capacity. [0003] Compared with the traditional graphite anode, silicon has an ultra-high theoretical specific capacity (4200mAh / g) and a lower delithiation potential (...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/386H01M4/625Y02E60/10
Inventor 谭强强王鹏飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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