| abstract |
The present invention provides a porous active material-based anode active material comprising a core portion containing bismuth (Si) and MxSiy and a shell portion on the core portion, the shell portion comprising Si and a plurality of holes, wherein, in MxSiy Wherein M is at least one element selected from the group consisting of 2A, 3A and 4A elements and transition metals, 1□x□4 and 1□y□4, and an anode active material mainly prepared by porous ruthenium. method.nAccording to an embodiment of the present invention, the capacitance characteristics and lifetime characteristics of the lithium secondary battery can be improved by minimizing the volume expansion of the anode active material during charging and discharging. |