Wood carbon fiber/metal oxide/graphene composite negative electrode material and its preparation method and application
A graphene composite and anode material technology, applied in battery electrodes, electrochemical generators, structural parts, etc., can solve problems such as difficulty in exerting the advantages of biomass carbon materials, irregular morphology of carbon anode materials, high specific capacity and high rate performance, etc. problem, to achieve fast radial ion diffusion characteristics, unique anisotropy, and the effect of improving volumetric energy density
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[0039] The present invention also provides a preparation method of wood charcoal fiber / metal oxide / graphene composite negative electrode material, comprising the following steps:
[0040] (1) Disperse the wood charcoal fiber in the aqueous solution with the surface modifier, then add the metal salt and graphene oxide in sequence, stir and mix evenly, place it in the reaction vessel, and carry out the hydrothermal reaction at 120°C-160°C, In-situ growth of metal oxide precursors on the surface of carbon fibers and wrapping graphene oxide to obtain precipitates;
[0041](2) Filtrate and dry the precipitate obtained in step (1), heat up to 400° C. to 800° C. for sintering under a protective gas atmosphere, and obtain a wood carbon fiber / metal oxide / graphene composite negative electrode material.
[0042] The preparation method of the invention can improve the defect of low tap density after sintering in the biomass raw material, and improve the volume energy density of the negati...
Embodiment 1
[0044] A wood carbon fiber / metal oxide / graphene composite negative electrode material, the microscopic appearance is hollow fiber, the diameter is 1 μ m ~ 10 μ m, NiO nanoparticles are evenly distributed on the surface of wood carbon fiber, graphene is wrapped in NiO nano The wood-charcoal fiber tube walls of the particles form a three-dimensional core-shell structure. When the charge and discharge current is 50mA / g, the first discharge specific capacity reaches 1062.3mAh / g, and the charge specific capacity is 684.1mAh / g.
[0045] Such as figure 1 Shown, a kind of preparation method of wood charcoal fiber / metal oxide / graphene composite negative electrode material of the present embodiment comprises the following steps:
[0046] (1) Disperse 1g of wood charcoal fiber in 60mL aqueous solution with 0.1g of cetyltrimethylammonium bromide (CTAB), then add 2g of nickel nitrate and 0.1g of graphene oxide in turn, and mix evenly with ultrasonic stirring, The mixed solution was obtai...
Embodiment 2
[0056] A preparation method of the wood charcoal fiber / metal oxide / graphene composite negative electrode material of the present embodiment comprises the following steps:
[0057] (1) Disperse 1g of wood charcoal fiber in 60mL aqueous solution with 0.1g of CTAB added, then add 1g of nickel nitrate and 0.1g of graphene oxide in sequence, and mix them evenly with ultrasonic stirring to obtain a mixed solution, then put the mixed solution into water Thermal reaction kettle, conduct hydrothermal reaction at 120°C for 6 hours, grow NiO precursor in situ on the surface of carbon fiber and wrap graphene oxide to obtain a precipitate.
[0058] (2) After filtering, cleaning and drying the precipitate obtained in step (1), put it into a tube furnace with argon gas for sintering, raise the temperature to 400°C at 10°C / min and keep it warm for 3h, and cool to room temperature to obtain woody Carbon fiber / metal oxide / graphene composite anode material.
[0059] In this embodiment, the wood...
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