The method of producing a carbon-coated silicon material

Than conventional silicon material to provide a suitable silicon material and a manufacturing method thereof. Layered silicon compound manufacturing step of CaSi Silicon material manufacturing process of the silicon material by heating the layered silicon compound 300 ° C. or higher, Coating step of coating the silicon material with carbon, The method of producing a carbon-coated silicon material which comprises a washing step, washing the silicon material through the silicon material or the covering step relative dielectric constant of 5 or more solvents.