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Carbon fiber and preparation method thereof, and application of carbon fiber, electrode and vanadium redox flow battery

A carbon fiber and fiber technology, applied in the field of flow batteries, can solve the problems of complex preparation process, low surface activity, low conductivity, etc., and achieve the effects of high surface activity, improved surface reactivity, and low production cost

Active Publication Date: 2019-07-30
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of low conductivity, low surface activity, high resistivity, high cost and complicated preparation process of the electrode material of the liquid flow battery in the prior art, and provide a carbon fiber and its preparation method and application as well as a complete Vanadium redox flow battery

Method used

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  • Carbon fiber and preparation method thereof, and application of carbon fiber, electrode and vanadium redox flow battery
  • Carbon fiber and preparation method thereof, and application of carbon fiber, electrode and vanadium redox flow battery
  • Carbon fiber and preparation method thereof, and application of carbon fiber, electrode and vanadium redox flow battery

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Embodiment approach

[0028] According to a preferred embodiment of the present invention, the interlayer distance d002 of the carbon fiber has a value of 0.3354-0.3396 nm, more preferably 0.3354-0.3370 nm. The interlayer d002 value of the carbon fiber provided by the present invention is smaller than that provided by the prior art, and the interlayer d002 value of the carbon fiber provided by the prior art is generally greater than 0.3450nm.

[0029] According to a preferred embodiment of the present invention, the radial graphite crystallite size Lc of the carbon fiber is 35.6-86.7 nm, more preferably 40-60 nm. The carbon fiber provided by the present invention has a relatively large Lc value of graphite crystallite size in the radial direction of the fiber, and the Lc value of the carbon fiber provided by the prior art is generally less than 2nm.

[0030] According to a preferred embodiment of the present invention, the fiber axial graphite crystallite size La value of the carbon fiber is 43-80 ...

Embodiment 1-3

[0065] (1) 600g of coal liquefied pitch (provided by Shenhua Group Coal-to-Liquid Chemical Industry Research Institute) is broken into powder, added to the reactor, and polymerized to obtain spinnable pitch, the ash content (% by weight) and softening point (weight %) of coal liquefied pitch ( ℃), polymerization reaction temperature (℃), time (h), nitrogen flow rate (ml / min / g) and the softening point (℃) of the obtained spinnable pitch, carbon-hydrogen ratio, oxygen content (weight %), hydrogen See Table 1 for content (weight %) data.

[0066] (2) Spinnable pitch is added to the spinning tank, and spinning is carried out to obtain pitch fiber precursors, spinning temperature (°C), spinning pressure (MPa), spinning speed (m / min) and the fibers of pitch fiber precursors See Table 2 for diameter (μm) data.

[0067] (3) The pitch fiber precursors were oxidized and stabilized to obtain pre-oxidized fibers. The temperature (° C.), time (h) and air flow (ml / min / g) data of the oxidat...

Embodiment 4

[0078] According to the method of Example 1, the difference is that the temperature of oxidation modification in step (5) is 450° C., and the time is 1 h to obtain carbon fibers. The results of carbon fiber analysis are shown in Table 4.

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Abstract

The invention relates to the field of flow batteries, and discloses a carbon fiber and a preparation method thereof, and application of a carbon fiber, an electrode and a vanadium redox flow battery.The numerical value of the crystal layer spacing d002 of the carbon fiber is less than 0.3417 nm, the value of the fiber radial graphite crystallite dimension Lc of the carbon fiber is more than 35.6nm, and the value of the fiber axial graphite crystallite dimension La of the carbon fiber is more than 43 nm. The carbon fiber provided by the invention has the advantages of low resistivity and highsurface activity, and is low in production cost; the carbon fiber provided by the invention is particularly suitable for an electrode material of a flow battery; and when the carbon fiber provided bythe invention is used as the electrode material of the flow battery, the surface reactivity of the electrode of the flow battery can be effectively improved, and the internal resistance of the electrode of the flow battery is reduced.

Description

technical field [0001] The invention relates to the field of flow batteries, in particular to a carbon fiber, a preparation method and application thereof, an electrode and an all-vanadium flow battery. Background technique [0002] With the increase of human demand for energy, it is difficult for traditional fossil energy to meet people's demand in the near future. Therefore, the development and utilization of renewable energy such as wind energy and solar energy have attracted widespread attention. However, these renewable energy sources are discontinuous, unstable, restricted by regional environment, and difficult to connect to the grid, resulting in low utilization rate, high wind and light abandonment rate, and waste of resources. Energy storage technology can improve the utilization rate and stability of renewable energy through the storage and release of energy, and is a key technology for the development and utilization of new energy. [0003] Flow batteries are a t...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M8/18
CPCH01M4/96H01M8/188Y02E60/50
Inventor 王秋实刘庆华刘均庆段春婷梁朋郑冬芳梁文斌马浩初
Owner CHNA ENERGY INVESTMENT CORP LTD
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