Silicon-based composite material, preparation method thereof, and lithium-ion battery
A technology of silicon-based composite materials and negative active materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor high-rate charge and discharge performance, low first-cycle coulombic efficiency, and poor material stability. Achieve the effects of improving the first Coulombic efficiency and cycle stability, simple process, and excellent structural stability
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[0030] The invention provides a method for preparing a silicon-based composite material, comprising the following steps:
[0031] SiO x Mixing treatment with carbon source to obtain SiO x @carbon source mix;
[0032] In an inert atmosphere, the SiO x @Carbon source mixture is solidified and carbonized to obtain SiO x @carbon;
[0033] The SiO x @Carbon is dispersed in a solution with an oxidizing agent, and a conductive polymer monomer and a conductive carbon material are added at the same time to uniformly disperse and in-situ polymerize to obtain a silicon-based composite material;
[0034] The silicon-based composite material is a double-shell core-shell structure material, the outer shell layer is a conductive polymer layer, the inner shell layer is a carbon layer, and a conductive carbon material is embedded on the conductive polymer layer;
[0035] Among them, the SiO x In 0x @Carbon source mix means carbon source coated in SiO x The mixture formed on the surface...
Embodiment 1
[0055] A silicon-based composite material is prepared by the following steps:
[0056] (a) Take a silicon-oxygen material (SiO2) with an average particle size of 15 μm x , 0x @petro asphalt mix.
[0057] (b) SiO x @Petroleum asphalt mixture is placed in a rotary furnace, heated to 250°C at a rate of 10°C / min in a nitrogen atmosphere, and solidified at a constant temperature for 1 hour, then continued to be heated at a rate of 10°C / min to 800°C, kept at a constant temperature for 3 hours, and carbonized to obtain Carbon-coated silicon-oxygen material, SiO x @carbon.
[0058] (c) take the SiO that step (b) obtains x @Carbon 20g is dissolved in an aqueous solution of iron p-toluenesulfonate, and polythiophene monomer (edot) is added, and stirred for 20h at a stirring speed of 800 rpm, so that the polythiophene monomer is polymerized in SiO x @Carbon Surface, among them, polythiophene monomer and SiO x The mass ratio of @ carbon is 0.2:1, and the molar ratio of iron p-toluen...
Embodiment 2
[0061] A silicon-based composite material is prepared by the following steps:
[0062] (a) Take a silicon-oxygen material (SiO2) with an average particle size of 15 μm x , 0x @petro asphalt mix.
[0063] (b) SiO x @Petroleum asphalt mixture is placed in a rotary furnace, heated to 250°C at a heating rate of 10°C / min under a nitrogen atmosphere, and solidified at a constant temperature for 1 hour, then raised to 800°C at a heating rate of 10°C / min, kept at a constant temperature for 3 hours, and carbonized to obtain Carbon-coated silicon-oxygen material, SiO x @carbon.
[0064] (c) take the SiO that step (b) obtains x @Carbon 20g is dissolved in an aqueous solution of ferric p-toluenesulfonate, and polythiophene monomer (edot), conductive carbon black is added, stirred at a stirring speed of 800 rpm for 20h, so that the polythiophene monomer is polymerized in SiO x @Carbon Surface, among them, polythiophene monomer and SiO x The mass ratio of @ carbon is 0.2:1, the molar ...
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