METHOD FOR MANUFACTURING SILICON-BASED NANOCOMPOSITE CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY USING SAME

摘要

The present invention relates to a method for manufacturing a silicon-based nanocomposite cathode active material for a lithium secondary battery and a lithium secondary battery using same. More particularly, the key technical feature of the present invention is a method for manufacturing a silicon-based nanocomposite cathode active material for the lithium secondary battery and the lithium secondary battery using same, comprising the following steps: a first step of mounting a silicon-based wire between two electrodes, which are placed in a methanol-based solvent atmosphere, and manufacturing a dispersion solution in which silicon-based nanoparticles are dispersed by means of high-voltage pulse discharging; and a second step of manufacturing a silicon-based nanocomposite body by compositing the silicon-based nanoparticles in the solution and a different type of material. By using the silicon-based nanocomposite cathode in the lithium secondary battery according to the method, the advantages provided are of improving electronic conductivity and lithium-ion conductivity by means of the different type of material having a high-capacity characteristic, which encases the silicon-based nanoparticles, and of providing the lithium-ion secondary battery having enhanced battery capacity and charge/discharge cycle properties.