A kind of porous silicon-based composite material and its preparation method and application
A composite material and porous silicon-based technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of cycle stability to be improved, and achieve the effect of improving cycle stability, excellent rate performance, and high yield
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Embodiment 1
[0032](1) Preparation of porous silicon-based composite materials
[0033]SiOy(y≈1) The precursor, metal powder Mg and molten salt NaCl are uniformly mixed according to the molar ratio of 1:1:10; the mixture is transferred to a tube furnace, and the temperature is raised to 700°C under the protection of an inert atmosphere, and the reaction is cooled for 5 hours. At room temperature, the reaction product is obtained; the reaction product is placed in a 1 mol / L hydrochloric acid solution for etching to remove the reaction by-products, and the porous silicon-based composite material can be obtained after centrifugation, washing and vacuum drying at 80°C.
[0034](2) Preparation of electrode sheet
[0035]The obtained porous silicon-based composite material, acetylene black, and CMC binder were mixed in a weight ratio of 7:1.5:1.5 to prepare a slurry and coated on the copper foil current collector, and dried at 60°C for 10 hours under vacuum conditions Obtain electrode pads. Using metal lithium...
Embodiment 2
[0038]SiOy(y≈2) Precursor, metal powder Al and molten salt AlCl3Mix uniformly according to the molar ratio of 1:5:8; transfer the mixture to a tube furnace, heat up to 650°C under the protection of an inert atmosphere, and cool to room temperature after reacting for 3 hours to obtain the reaction product; the reaction product is placed at 0.1 mol / The reaction byproducts are removed by etching in the L sulfuric acid solution, and the porous silicon-based composite material can be obtained after centrifugation, washing and vacuum drying at 100°C.
[0039]According to the method in Example 1, the electrode was prepared, the battery was assembled, and the charge-discharge cycle test was performed.
Embodiment 3
[0041]SiOy(y≈1.5) The precursor, metal powder Mg and molten salt KCl are uniformly mixed according to the molar ratio of 1:2:7; the mixture is transferred to a tube furnace, and the temperature is raised to 500°C under the protection of an inert atmosphere, and the reaction is cooled for 3 hours. At room temperature, the reaction product is obtained; the reaction product is placed in a 2mol / L nitric acid solution to etch and remove the reaction by-products, and the porous silicon-based composite material can be obtained after centrifugation, washing and vacuum drying at 90°C.
[0042]According to the method in Example 1, the electrode was prepared, the battery was assembled, and the charge-discharge cycle test was performed.
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