A kind of preparation method of rice husk derived hard carbon and its obtained material and application
A rice husk and hard carbon technology, which is applied in the preparation/purification of carbon, electrochemical generators, structural parts, etc., can solve the problem that rice husk is not well utilized, and achieve excellent electrochemical performance and repeatability Strong, low-cost effect
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Embodiment 1
[0034] Preparation of (1) derived from rice hull hard carbon (RHHC-1300) in
[0035] Weigh 10g rice husk immersed in 400mL 6mol·L -1 Hydrochloric acid, stirred for 6h. Hydrochloric acid and then drained, the treated rice hulls immersed in 400mL 10% hydrochloric acid, hydrofluoric acid, stirred for 12h. The hydrofluoric acid is then drained, washed with distilled water hulls with ultrasound, each 300 mL, each ultrasonic 10min, washed five times. 70 deg.] C then transferred to a forced air oven dried 12h, and then dried under vacuum 120 ℃ 12h, chaff obtained after acid treatment. Subsequently, the resulting product was taken 2g placed in a porcelain boat and transferred into a tube furnace and heated under an argon atmosphere at a heating rate of 5 ℃ / min to 1300 ℃, holding 2h, to give a black rice hulls derived hard carbon (RHHC -1300).
[0036] (2) rice hull derived hard carbon (RHHC-1300) Characterization
[0037] Analysis of the resulting hard carbon rice hull derived size, mor...
Embodiment 2
[0043] Preparation of (1) derived from rice hull hard carbon (RHHC-1100) in
[0044] Example 1 weighed acid-treated product was dried 2g porcelain boat and transferred into a tube furnace, heated at a heating rate of 5 ℃ / min to 1100 ℃ under argon atmosphere and then maintained at 1100 ℃ 2h, to give a black rice hull derived hard carbon (RHHC-1100).
[0045] (2) electrochemical tests
[0046] In N- methyl-2-pyrrolidone (NMP) as a solvent, prepared in Example of the present embodiment will be derived from the husk of the hard carbon (RHHC-1100) and carbon black (Super-P), polyvinylidene fluoride (PVDF) in 8: 1: 1 mass ratio of grinding and mixing homogeneously, the resulting slurry was uniformly applied and dried 12h under vacuum at 80 deg.] C on a Cu foil, to obtain a loading of 1.0-1.5mg cm -2 The electrode sheet. Use 1mol L -1 NaClO 4 Ethylene carbonate (EC) / diethyl carbonate (DEC) (volume ratio of 1: 1) solution as the electrolyte sodium ion battery, glass fibers, and metal ...
Embodiment 3
[0049] (1) Preparation of hard carbon rice hull derived (RHHC-1500)
[0050] Example 1 taking said acid treatment embodiment 2g dried product was transferred to a porcelain boat and transferred to a tube furnace, under an argon atmosphere at 5 ℃ / min -1 The heating rate was raised to 1500 ℃, then for 2h at 1500 ℃, to give a black rice hull derived hard carbon (RHHC-1500).
[0051] (2) electrochemical tests
[0052] In N- methyl-2-pyrrolidone (NMP) as a solvent, prepared in Example of the present embodiment will be derived from the husk of the hard carbon (RHHC-1500) and carbon black (Super-P), polyvinylidene fluoride (PVDF) in 8: 1: 1 mass ratio of grinding and mixing homogeneously, the resulting slurry was uniformly applied and dried 12h under vacuum at 80 deg.] C on a Cu foil, to obtain a loading of 1.0-1.5mg cm -2 The electrode sheet. Use 1mol L -1 NaClO 4 Ethylene carbonate (EC) / diethyl carbonate (DEC) (volume ratio of 1: 1) solution as the electrolyte sodium ion battery, g...
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