A kind of silicon carbon composite material and its preparation method and application
A technology of silicon-carbon composite materials and nano-silicon, which is applied in the field of silicon materials, can solve problems such as battery performance attenuation, achieve the effects of suppressing volume expansion, thin and uniform coating layer, and improving the first Coulombic efficiency
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Embodiment 1
[0031] The present invention proposes a method for preparing a silicon carbon composite material, comprising the following steps:
[0032] S1, the nano silicon particles into the cathode stage of the reactor, the furnace body is anode, the furnace cavity is vacuumed to 0.1Pa, into which methane gas is introduced, so that the pressure in the furnace chamber is maintained at 700Pa;
[0033] S2, between the anode and cathode of the reactor voltage of 600V, the current density of 1.0mA / cm 2 The direct current, high voltage current produces glow discharge, so that the methane gas in the furnace cavity decomposes to form carbon positive ions, carbon positive ions bombard the surface of the nano-silicon, convert the kinetic energy into thermal energy to heat the workpiece, while absorbing electrons to reduce atoms to be absorbed by the surface of the nano-silicon and diffuse to the inner layer, to obtain carbon-doped nano-silicon material; Carbon positive ions bombard the surface of the na...
Embodiment 2
[0038] The present invention proposes a method for preparing a silicon carbon composite material, comprising the following steps:
[0039]S1, put the nano-silicon particles into the cathode stage of the reactor, the furnace body is anode, the furnace cavity is vacuumed to 0.2Pa, and ammonia is injected into it, so that the pressure in the furnace chamber is maintained at 500Pa;
[0040] S2, between the anode and cathode of the reactor voltage of 700V, the current density of 0.8mA / cm 2 The direct current, high voltage current produces glow discharge, so that the ammonia in the furnace cavity decomposes to generate nitrogen positive ions, nitrogen positive ions bombard the surface of the nano-silicon, converted from kinetic energy into thermal energy heating workpiece, while absorbing electrons reduced to atoms absorbed by the surface of nano-silicon and diffusion to the inner layer, to obtain nitrogen-doped nano-silicon material; Nitrogen positive ions bombard the surface of the na...
Embodiment 3
[0045] The present invention proposes a method for preparing a silicon carbon composite material, comprising the following steps:
[0046] S1, the nano silicon particles into the cathode stage of the reactor, the furnace body is anode, the furnace cavity is vacuumed to 1Pa, into which the methane and ammonia gas mixture is introduced, so that the pressure in the furnace chamber is maintained at 1000Pa;
[0047] S2, the voltage is applied between the anode and cathode of the reactor is 700V, and the current density is 1.0mA / cm 2 The direct current, high voltage current produces glow discharge, so that the mixed gas in the furnace cavity decomposes to generate positive ions of carbon and nitrogen, and the positive ions of carbon and nitrogen bombard the surface of the nano-silicon, convert the kinetic energy into thermal energy to heat the workpiece, and at the same time absorb electrons to reduce atoms to be absorbed by the surface of the nano-silicon and diffuse to the inner layer, ...
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Abstract
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