METHOD FOR PREPARING CORE-SHELL STRUCTURED NANOPARTICLES FOR SECONDARY BATTERY NEGATIVE ELECTRODE ACTIVE MATERIAL, AND CORE-SHELL STRUCTURED NANOPARTICLES FOR SECONDARY BATTERY NEGATIVE ELECTRODE ACTIVE MATERIAL PREPARED THEREFROM

摘要

The present invention relates to a method for preparing core-shell structured nanoparticles for a secondary battery negative electrode active material, and core-shell structured nanoparticles for a secondary battery negative electrode active material prepared therefrom, and, more specifically, provides a method for preparing core-shell structured nanoparticles for a secondary battery negative electrode active material, comprising a metallic core and a polymeric shell surrounding the core, the method comprising the steps of: mixing a metal precursor solution and a polymer solution (step 1); irradiating the mixed solution of step 1 with ultrasound (step 2); and drying the ultrasound-irradiated solution of step 2 and thereafter conducting heat-treatment (step 3). The method for preparing core-shell structured nanoparticles for a secondary battery negative electrode active material, and the core-shell structured nanoparticles for a secondary battery negative electrode active material prepared therefrom, according to the present invention, produce a secondary battery negative electrode active material by only conducting ultrasonic irradiation and heat-treatment onto a precursor solution and therefore have low costs, and have a short reaction time for synthesis and are therefore suitable for mass production. In addition, it is possible to adjust the thickness of a polymer layer and prepare particles having a uniform size by varying synthesis conditions. Furthermore, the core-shell structured nanoparticles for a secondary battery negative electrode active material prepared according to the present invention have an advantageous effect of: providing a battery with higher capacity compared to when using a conventional carbon-based core, by comprising a metallic core; and providing a battery having excellent lifetime characteristics, by comprising a polymeric shell and thus minimizing the occurrence of cracks, side reactions, and gas generation.