Negative electrode for lithium secondary battery and lithium secondary battery including same

According to one embodiment of the disclosed technology, the negative electrode active material for the secondary battery comprises a negative electrode current collector, the first negative electrode active material layer is positioned on at least one surface of the negative electrode current collector and comprises a graphite-based active material and a silicon-based active material doped with a metal element; and the second negative electrode active material layer is positioned on the first negative electrode active material layer and comprises a porous structure. The porous structure includes a carbon-based particle having pores and a silicon-containing coating formed inside the pores or on a surface of the carbon-based particle. 根据所公开技术的一个实施方案，一种用于二次电池的负极活性物质包括负极集流体、位于负极集流体至少一个表面上并包括石墨基活性物质和掺杂有金属元素的硅基活性物质的第一负极活性物质层以及位于第一负极活性物质层上并包括多孔结构的第二负极活性物质层。多孔结构包括具有孔隙的碳基颗粒和形成于孔隙内部或碳基颗粒表面上的含硅涂层。