A kind of preparation method of copper-doped core-shell structure silicon carbon composite material
A silicon-carbon composite material and core-shell structure technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of insignificant volume effect and poor material cycle stability, and achieve simple and controllable process, high initial efficiency, The effect of improving the first-time efficiency
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[0019] The invention discloses a method for preparing a silicon-carbon composite material with a copper-doped core-shell structure, comprising the following steps:
[0020] 1) Soak nano-silica powder with hydrofluoric acid solution under ultrasonic conditions to remove silicon oxide on the surface and perform micro-etching, wash and dry with deionized water; the mass percentage concentration of the hydrofluoric acid solution is 5% to 20%, Soaking time is 5-30 minutes. The size of the nano silicon powder is <100nm.
[0021] 2) Use deionized water to prepare a cross-linking system composed of a certain concentration of water-soluble phenolic resin and polyethyleneimine, aldehyde resin: polyethyleneimine = 4:1; under magnetic stirring, add an appropriate proportion to the solution according to Step 1) Prepared nano-silica powder; then slowly add copper ion solution dropwise, polyethyleneimine and copper ion rapidly undergo a complexation reaction to form a chelate; The concentr...
Embodiment 1
[0026] A method for preparing a copper-doped core-shell structure silicon-carbon composite material, comprising the following steps:
[0027] 1) Soak 50g of nano-silicon powder in 5% hydrofluoric acid solution for 30 minutes, then filter and wash with deionized water for 4 times, then transfer to an oven for drying at 105°C.
[0028] 2) Take 20g of water-soluble phenolic resin and 5g of polyethyleneimine in a 500ml beaker, add 100ml of deionized water and stir for 2 hours under magnetic stirring to dissolve to form a stable cross-linking system, then slowly add 140ml of copper sulfate solution, copper sulfate The solution is 0.2mol / L, and the time is controlled at 40min. Polyethyleneimine and copper ions undergo a complex reaction rapidly to form a chelate.
[0029] 3) The slurry prepared in step 2) is transported to the high-speed rotating centrifugal nozzle by a peristaltic pump at a flow rate of 0.5ml / min, atomized into liquid droplets, and the hot air flow in the spray dry...
Embodiment 2
[0037] A method for preparing a copper-doped core-shell structure silicon-carbon composite material, comprising the following steps:
[0038] 1) Soak 40g of nano-silicon powder in 10% hydrofluoric acid solution for 5 minutes, then filter and wash with deionized water for 3 times, then transfer to an oven for drying at 100°C.
[0039] 2) Take 15g of water-soluble phenolic resin and 4g of polyethyleneimine in a 500ml beaker, add 100ml of deionized water and stir for 2.5h under magnetic stirring to dissolve to form a stable cross-linking system, then slowly add 120ml of copper sulfate solution, sulfuric acid The copper solution is 0.2mol / L, and the time is controlled at 30min. Polyethyleneimine and copper ions undergo a complex reaction rapidly to form a chelate.
[0040]3) The slurry prepared in step 2) is delivered to the high-speed rotating centrifugal nozzle by a peristaltic pump at a flow rate of 0.1ml / min, atomized into droplets, and the hot air flow in the spray dryer vola...
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