Lithium secondary battery

A lithium secondary battery according to an embodiment of the present invention includes a positive electrode and a negative electrode. The positive electrode includes lithium metal oxide particles containing lithium and a metal element. The lithium metal oxide particles have a concentration gradient region formed in at least one region between the center and the surface. The concentration of the at least one metal element varies in a concentration gradient region. The negative electrode includes a negative electrode active material including a silicon-based active material and a carbon-based active material. The content of the carbon-based active material in the negative electrode active material is greater than the content of the silicon-based active material. 根据本发明的实施方案的锂二次电池包括正极和负极。正极包括含有锂和金属元素的锂金属氧化物颗粒。锂金属氧化物颗粒具有形成在中心和表面之间的至少一个区域中的浓度梯度区域。至少一种金属元素的浓度在浓度梯度区域中变化。负极包括含有硅基活性物质和碳基活性物质的负极活性物质。负极活性物质中碳基活性物质的含量大于硅基活性物质的含量。