Lithium secondary battery

The present invention relates to a lithium secondary battery, and more particularly, to a lithium secondary battery having a composition, thereby significantly improving life characteristics and exhibiting excellent penetration durability, the lithium secondary battery comprising an anode electrode, a cathode electrode, and a separation membrane interposed between the anode electrode and the cathode electrode, the anode electrode contains an anode active material containing a lithium-metal oxide in which at least one metal has a concentration gradient region between a center portion and a surface portion, and the separation film contains a base thin film and a ceramic coating layer formed on at least one surface of the base thin film. 本发明涉及一种锂二次电池，更详细地，涉及一种因具有下述组成，从而寿命特性显著提高且表现出优异的贯穿耐久性的锂二次电池，其包含阳极电极、阴极电极及插入在所述阳极电极与阴极电极之间的分离膜，所述阳极电极包含含有锂-金属氧化物的阳极活性物质，所述锂-金属氧化物中的至少一种金属在中心部到表面部之间具有浓度梯度区域，所述分离膜包含基材薄膜及形成在所述基材薄膜的至少一个面上的陶瓷涂布层。