Method and device for preparing high-purity silicon monoxide in batches

Abstract

The invention provides a method and a device for preparing high-purity silicon monoxide in batches. The method comprises the following steps: uniformly mixing silicon powder and silicon dioxide powder, carrying out heating and heat preservation treatment to generate silicon monoxide steam, collecting the silicon monoxide steam, and instantly condensing and depositing the silicon monoxide steam by adopting cooling gas to obtain high-purity silicon monoxide. The device comprises a feed port, a reaction zone, a deposition zone and a discharge port, the feed port is connected with the reaction zone, the discharge port is connected with the deposition zone, the reaction zone is communicated with the deposition zone through a silicon monoxide gas transfer port, and the deposition zone is further provided with a cooling device. The silicon monoxide powder material prepared by adopting the method and the device disclosed by the invention is uniform in granularity, high in purity and free from agglomeration, meanwhile, the preparation process of the silicon monoxide powder is shortened, the cost is saved, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of silicon monoxide preparation, and in particular relates to a method and a device for preparing high-purity silicon monoxide in batches. Background technique [0002] Silicon monoxide is a wide bandgap semiconductor optical material, which is widely used in vacuum coating. With the rapid development of new energy vehicles, the performance of lithium-ion batteries needs to be further improved. Silicon monoxide has attracted extensive attention due to its high specific capacity and excellent cycle performance. As a substitute for graphitized carbon materials, it has been gradually applied in the field of lithium-ion batteries. [0003] At present, the following methods are generally used to prepare silicon monoxide powder: one is to use carbon and silicon dioxide to react under high temperature conditions to prepare silicon monoxide. Since carbon is generally added in excess as a reducing agent, there will ...

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Problems solved by technology

[0003] At present, the following methods are generally used to prepare silicon monoxide powder: one is to use carbon and silicon dioxide to react under high temperature conditions to prepare silicon monoxide. Since carbon is generally added in excess as a reducing agent, there will be silicon carbide impurities in the product. affect the purity of silicon monoxide; the second is to use hydrogen and silicon dioxide to react at high temperature to prepare silicon monoxide, which is dangerous and generally not suitable for large-scale industrial production; the third is to use silicon powder and silicon dioxide in the Silicon monoxide is prepared by reacting under high temperature and vacuum conditions. This method is currently the main method for preparing silicon monoxide, but this method takes a long time and consumes a lot of energy, and the silicon monoxide material prepared by this method is in the form of a block. , needs further crushing and screening to be used as the raw material product of silicon oxide negative electrode material, and there will be a certain loss in the crushing process, the loss rate is as high as 20-30%, resulting in serious waste

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