Preparation method of silicon carbon composite material and application thereof used as lithium ion battery negative electrode material
A technology of silicon-carbon composite materials and silicon sources, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high energy consumption and heavy pollution, and achieve the effects of improving electronic conductance, reducing energy consumption, and simple process
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[0022] The method for preparing the silicon-carbon composite material of the present invention includes the following steps: (1) At room temperature, weigh the silicon source, molten salt, and reducing agent in a specific ratio, and the above-mentioned raw materials and balls according to the ball-to-material ratio of 3:1 -5:1 Put the ball into the ball mill tank, the volume of the ball material does not exceed 2 / 3 of the ball mill tank, mechanically mix for 2-6 hours at a rotating speed of 300-450r / h, and put the resulting mixture in a closed inner liner. After being sealed in a hydrothermal tank, heat treatment for a certain period of time in an oven at 190-280°C to obtain the corresponding silicon-containing precursor; (2), the silicon-containing precursor obtained in step (1) is subjected to acid treatment to remove metal compounds, Silicon dioxide is used to obtain elemental silicon powder; (3), after the elemental silicon powder obtained in step 2) is uniformly mixed with ...
Example Embodiment
[0025] Example 1: Preparation method of silicon-carbon composite material, which includes the following steps: (1) Select molecular sieve as silicon source, select Mg powder as reducing agent, select AlCl3 as low-temperature molten salt; select pitch as carbon source, Mg powder and The molar ratio of molecular sieve is 1:1-2:1, and the molar ratio of Al in the low-temperature molten salt to Si in the molecular sieve is 8:1-12:1. At room temperature, weigh a certain amount of molecular sieve powder, Mg powder and AlCl3 powder, put the above-mentioned raw materials and balls into a ball milling tank at a ratio of 5:1, and mix them mechanically for 5h at a speed of 350r / h, so that the raw materials are fully and uniformly mixed, and the resulting mixture is placed in a closed In the 20ml polytetrafluoroethylene liner, sealed with a stainless steel hydrothermal tank, heat-treated in an oven at 190℃ for 10h to obtain the corresponding silicon-containing precursor; (2), the content ob...
Example Embodiment
[0026] Embodiment 2: The preparation method of silicon-carbon composite material, which includes the following steps: (1) Select molecular sieve as silicon source, select Mg powder as reducing agent, select AlCl3 as low-temperature molten salt; select pitch as carbon source, Mg powder and The molar ratio of molecular sieve is 1.5:1, and the molar ratio of Al in the low-temperature molten salt to Si in the molecular sieve is 10:1. At room temperature, weigh a certain amount of molecular sieve powder, Mg powder and AlCl3 powder, and combine the above raw materials and balls. Put the ball-to-material ratio into a ball mill tank at a ratio of 3:1, and mechanically mix for 2h at a rotating speed of 300r / h to make the raw materials fully and uniformly mixed. The resulting mixture is put into a closed 20ml PTFE liner After sealing with a stainless steel hydrothermal tank, heat treatment in an oven at 230°C for 6 hours to obtain the corresponding silicon-containing precursor; (2) Put th...
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