Preparation method of nano silicon monoxide powder

Abstract

The invention discloses a preparation method of nano silicon monoxide powder, which comprises the following steps of: continuously feeding silicon powder, spraying silicon dioxide powder, entering working medium gas and preparing the nano silicon monoxide powder in a closed cavity: feeding from a silicon powder feeding pipe of which the upper part is communicated with a silicon powder feeding device; silicon powder at the outlet of the silicon powder feeding pipe is evaporated in the evaporation chamber by crossed plasma arc moments generated by a plurality of plasma guns which are arranged on the circular top plate and are electrically communicated with water to obtain silicon steam; a plurality of silicon dioxide powder injection pipes of the reaction chamber inject silicon dioxide powder, working medium gas in a working medium gas inlet pipe enters the reaction chamber and can drive powder to rotate, and silicon dioxide powder and silicon powder formed by cooled silicon steam are cooled, react with each other and then are conveyed to a condensation chamber at the lower part to be further condensed and reacted; the nanometer silicon monoxide powder is formed. The method is high in production efficiency, and the prepared silicon monoxide powder is reasonable in particle size distribution, high in sphericity degree and good in dispersity.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium battery negative electrode materials, in particular to a preparation method of nano-silicon oxide powder. Background technique [0002] Lithium battery or lithium-ion battery is a secondary battery, that is, a rechargeable battery, which usually includes a positive electrode, a negative electrode, a diaphragm, an electrolyte, and a casing. The positive electrode is a material with high delithiation potential, and the negative electrode is a material with low lithium intercalation potential. Compared with traditional batteries, lithium-ion batteries have many advantages, such as high energy density, high voltage, low self-discharge rate, no memory effect, long cycle life, wide operating temperature range, safe and reliable operation, and environmental protection. Lithium-ion batteries have been widely used in portable electronic devices such as mobile phones and notebook computers. ...

AI Technical Summary

Problems solved by technology

Even if the silicon oxide prepared by the above prior art is ball milled, it still cannot meet the quality requirements, because the ball mill commonly used in industrial production cannot achieve an average particle size of nanometers, generally only in microns, at most sub- Micron size, unable to reach the particle size of 150nm and below. If high-energy ball mill is used for ball milling, the particle size of nanometer size can be reached to a certain extent, but the production cost is too high

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