A kind of composite material, its preparation method and application
A composite material, carbon nanotube technology, applied in the direction of nanotechnology, nanotechnology, structural parts, etc. for materials and surface science, can solve the problems of difficult to meet demand, side reactions, low capacity, etc., to improve cycle life and Stability, good electrical conductivity, the effect of improving performance stability
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[0028] The embodiment of the present invention discloses a kind of preparation method of composite material, comprises the following steps:
[0029] (A) Disperse the purified carbon nanotubes in water, add sodium molybdate and phosphoric acid with a mass concentration of 85%, and infiltrate the carbon nanotubes;
[0030] (B) separating the infiltrated carbon nanotubes and washing with a polar organic solvent to obtain wet carbon nanotubes;
[0031] (C) Mixing the wet carbon nanotubes with concentrated hydrochloric acid, fully reacting, centrifuging and separating the precipitate, removing excess concentrated hydrochloric acid and molybdenum-based metal oxide on the surface of the precipitate to obtain a composite material.
[0032] According to the present invention, the preparation method of composite material is described in detail below according to each step:
[0033] (A) Disperse the purified carbon nanotubes in water, add sodium molybdate and phosphoric acid with a mass...
Embodiment 1
[0058] 1) Using single-walled carbon nanotubes as the substrate, using 6M H 2 SO 4 Sonicate for 6h to remove the metal catalyst, followed by 0.1M NaHCO 3 The solution was washed to neutrality, then washed three times with deionized water, and dried under vacuum at 60°C;
[0059] 2) Weigh 100 mg of single-walled carbon nanotubes in step 1) and disperse them in 100 mL of water, then add 5 g of sodium molybdate and 0.5 mL of 85% phosphoric acid and stir well, wait until the carbon nanotubes are fully infiltrated overnight, and then perform centrifugation. Rinse 3 times with ethanol to obtain wet carbon nanotubes, the interior of the carbon nanotubes is an acidic solution, and the exterior is an ethanol environment;
[0060] Add the obtained wet carbon nanotubes into a small beaker, drop 5mL of concentrated hydrochloric acid, and stir, fully react for 6h, then perform centrifugation, and wash 3 times with deionized water to remove excess hydrochloric acid and molybdenum-based ox...
Embodiment 2
[0064] 1) After the composite material prepared in Example 1 was dried at 120°C for 24 hours, it was evenly mixed with conductive agent carbon black and binder PVDF at a mass ratio of 80:10:10, coated on battery-grade copper foil, and dried at 120°C for 24 hours. Hours, use a cell slicer to cut into electrode sheets with a diameter of 11mm for use;
[0065] 2) Place the prepared electrode sheet in a Braun glove box, use the lithium sheet as the counter electrode, and 1M LiF 6 For the electrolyte, the celegard battery diaphragm is used as a diaphragm to assemble a C2032 button battery;
[0066] 3) Put the prepared C2032 button cell in the test room overnight and then test it. The test item is CV test.
[0067] For the C2032 button cell with the composite material prepared in Example 1 as the negative electrode, the test item is the cycle life test. The composite material maintains a specific capacity of 1000mAh / g after 100 cycles at a current density of 100mA / g, see figure ...
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