- HOLLOW CORE-SHELL ALLOY NANOPARTICLE AND METHOD FOR MANUFACTURING THEREOF

摘要

The present invention relates to a negative electrode active material of a secondary battery, which comprises a hollow core portion; And a shell made of a metal alloy of a first metal and a second metal, wherein the first metal has a lower reduction potential than the second metal. According to the present invention, by providing the alloy nano-particles having a hollow core-shell structure including a hollow portion therein, it is possible to accommodate the volume expansion during the reaction between lithium and sodium and the active material, .