Carbon plate cage coated porous silicon material, preparation method thereof and application
A technology of porous silicon and cages, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of low electron ion transmission efficiency, collapse of negative electrode material structure, and affect lithium ion transmission, etc., to shorten the transmission distance , high controllability, and easy large-scale preparation
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Embodiment 1
[0035] 1. Add an aluminum-silicon alloy (average particle size D50 between 1 to 5 μm, and a mass ratio of aluminum to silicon of 4:1) into hydrochloric acid (0.5 mol / L), and magnetically stir, filter or centrifuge to obtain porous silicon.
[0036] 2. Configure the sol-gel solution: in a mixed solution of 100ml ethanol and water (50ml ethanol, 50ml deionized water), add 0.1g glucose and 0.2mL siloxane solution.
[0037] 3. Add 0.5g of porous silicon powder slowly and uniformly to the configured sol-gel solution; stir for another 30min; then heat at 160℃ for 12h to prepare the precursor;
[0038] 4. After sintering the precursor of step 3 at 1000°C under an inert atmosphere (argon or nitrogen), C / SiO is obtained 2 Double continuous coating of porous silicon.
[0039] 5. Change the C / SiO of step 4 2 The double continuous coated porous silicon is added to 5wt% hydrofluoric acid, washed and then dried to obtain a carbon sheet cage coated with porous silicon.
[0040] The carbon sheet cage o...
Embodiment 2
[0042] 1. Add the aluminum-silicon alloy powder with an average diameter of 1μm (purchased from Jiweixin, the mass ratio of aluminum to silicon is 4:1) into 0.5mol / L HCl, and after magnetic stirring for 12h, after passing through deionized water and absolute ethanol, After rinsing for the second time, put the obtained sample in a vacuum drying oven and bake it at 50°C for 10 hours to obtain porous silicon.
[0043] 2. Configure the sol-gel solution: in a mixed solution of 100ml ethanol and water (50ml ethanol, 50ml deionized water), add 0.1g sucrose (C 6 H 12 O 6 ) And 0.2mL ethyl orthosilicate (28% TEOS) solution.
[0044] 3. Add 0.5g of porous silicon powder slowly and uniformly to the configured sol-gel solution; stir for another 30min; then heat at 160℃ for 12h to prepare the precursor;
[0045] 4. Raise the precursor to 800°C at a rate of 5°C / min and anneal for 2h under argon, then cool to room temperature to obtain SiO 2 / C The double continuous item is coated with porous silic...
Embodiment 3
[0049] 1. Add aluminum-silicon alloy powder with an average diameter of 1μm (purchased from Jiweixin, the mass ratio of aluminum to silicon is 4:1) into 0.5mol / L HCl, and after magnetic stirring for 12h, the mixture is heated with deionized water and absolute ethanol. After rinsing for the second time, put the obtained sample in a vacuum drying oven and bake it at 50°C for 10 hours to obtain porous silicon.
[0050] 2. Configure the sol-gel solution: in a mixed solution of 100ml ethanol and water (50ml ethanol, 50ml deionized water), add 0.1g sucrose (C 6 H 12 O 6 ) And 1 mL of ethyl orthosilicate (28% TEOS) solution.
[0051] 3. Add 0.5 g of porous silicon powder slowly and uniformly to the prepared sol-gel solution; stir for another 30 minutes and heat at 160°C for 12 hours to prepare a precursor.
[0052] 4. Under the protection of pure argon, the precursor is annealed at a rate of 5°C / min to 900°C for 2h, and then cooled to room temperature to obtain C / SiO 2 The bicontinuous item...
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