Carbon fiber, its preparation method and application, electrode and all-vanadium redox flow battery
A liquid flow battery and carbon fiber technology, applied in fuel cells, battery electrodes, regenerative fuel cells, etc., can solve the problems of complex preparation process, low surface activity, low conductivity, etc., achieve high surface activity, improve surface reactivity, The effect of low production cost
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[0028] According to a preferred embodiment of the present invention, the interlayer d002 value of the carbon fiber is 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 nm, more prefer...
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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