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A preparation method of flexible and highly conductive three-dimensional interconnected hollow carbon fibers

A technology of high conductivity and hollow carbon, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, etc. It can solve the problem of low loading capacity and achieve the effect of simple operation, good conductivity and high capacity adsorption

Active Publication Date: 2016-08-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a low-cost, high-efficiency, easy-to-industrialize, controllable preparation method of flexible and highly conductive three-dimensional interconnected hollow carbon fibers to solve the current problem of flexible current collector active materials used in lithium-ion batteries, lithium-sulfur batteries, fuel cells, etc. The problem of low loading capacity, and for the first time realized the preparation of high conductivity, high flexibility, high loading capacity, and carbon three-dimensional network structure

Method used

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  • A preparation method of flexible and highly conductive three-dimensional interconnected hollow carbon fibers
  • A preparation method of flexible and highly conductive three-dimensional interconnected hollow carbon fibers
  • A preparation method of flexible and highly conductive three-dimensional interconnected hollow carbon fibers

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preparation example Construction

[0039] In a specific embodiment, the method for preparing flexible and highly conductive three-dimensional interconnected hollow carbon fibers of the present invention uses long-fiber cellulose filaments as raw materials, and carbonizes and crystallizes the material through high-temperature treatment, thereby obtaining volume-controllable, hollow, highly conductive, and flexible carbon fibers. Carbon fiber network structure, the hollow carbon fiber has a diameter of 1-100 microns and an inner diameter of 0.5-90 microns. The specific steps are as follows:

[0040] (1) Select a certain amount of long-fiber filamentous raw materials (medical absorbent cotton, high-purity cosmetic cotton, absorbent cloth, natural cotton, cotton cloth and other carbon-containing long-fiber materials), and immerse them in carbonates (ammonia bicarbonate, sodium bicarbonate, Sodium carbonate, ammonium carbonate or magnesium carbonate, etc.) solution, add hydrochloric acid, nitric acid, acetic acid or ...

Embodiment 1

[0047] Process the cleaned and dried absorbent cotton into a mold of 2 cm × 3 cm × 2 mm, put it into a horizontal furnace, vacuumize, use argon as a protective gas (flow rate is 1000 sccm), and heat at 10 °C / min. The heating rate was raised to 600 °C, the heat treatment time was 4 h under argon, and the temperature was lowered to room temperature. Take out samples such asfigure 1 , image 3 shows poor crystallinity, Image 6 The sample resistance was shown to be 1.6M ohms. The sample resistance test uses a multimeter, and the measuring distance between the two probes is 1 cm.

Embodiment 2

[0049] Process the cleaned and dried absorbent cotton into a mold of 2 cm × 3 cm × 2 mm, put it into a horizontal furnace, vacuumize, use argon as a protective gas (flow rate is 1000 sccm), and heat at 10 °C / min. The heating rate was raised to 700 °C, the heat treatment time was 4 h under argon, and the temperature was lowered to room temperature. Take out samples such as figure 1 , image 3 shows poor crystallinity, Image 6 The sample resistance was shown to be 1.3K ohms.

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Abstract

The invention relates to the field of high-conductivity carbon materials and particularly relates to a preparation method of flexible high-conductivity three-dimensional connective hollow carbon fiber. The method comprises the following steps: by taking a long cellulose network as a raw material, carbonizing cellulose by high-heat treatment in an inert atmosphere, and performing expansion treatment to obtain a pore-controllable hollow high-conductivity flexible carbon fiber network structure. According to the method, the conductivity of a carbon fiber network is regulated ad controlled by virtue of different treatment temperature and different treatment time. The flexible high-conductivity three-dimensional connective hollow network-structure carbon fiber solves the problem that a common carbon material cannot have flexibility, high load bearing capacity and high conductivity at the same time.

Description

technical field [0001] The invention relates to the field of high-conductivity carbon materials, in particular to a method for preparing flexible and high-conductivity three-dimensional connected hollow carbon fibers. Background technique [0002] Due to its excellent chemical stability, good electrical conductivity, high strength, and large specific surface area, three-dimensional conductive nanocarbon materials are expected to be used in active material storage, flexible display, advanced Thermal interface materials, flexible wearable products, etc. For this reason, the research on the controllable preparation of flexible and highly conductive carbon materials has received more and more attention. At present, flexible conductive carbon materials mainly include carbon nanotubes, graphene, graphene oxide aggregates, graphene foam three-dimensional conductive network, etc. [0003] At present, the flexible and highly conductive network mainly has the following problems: the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/16
Inventor 刘畅赵石永方若翩侯鹏翔成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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