NOVELTY - A lithium secondary battery (100) has a positive electrode (30), a negative electrode (20), a separator (13), and an electrolyte solution. The negative electrode has a negative electrode collector (21) having several convex portions (22) on the surface, and a negative electrode active material layer (23) containing several active material components (24) on the collector. The negative electrode active material is alloy-group active material containing silicon or tin. The battery further has a porous insulating layer (15) containing inorganic oxide, between electrodes.    USE - Lithium secondary battery. Uses include but are not limited to power supply of personal computer, mobile telephone, mobile device, handheld terminal, portable game apparatus, video camera, electric tool, vacuum cleaner, hybrid electric vehicles, fuel cell electric vehicles, etc.    ADVANTAGE - The lithium secondary battery has high energy density and capacitance, and improved charging/discharging characteristics. The stress accompanying swelling and shrinkage of negative electrode active material is reduced.    DETAILED DESCRIPTION - A lithium secondary battery has a positive electrode having a positive electrode active material capable of occluding/releasing lithium ion, a negative electrode having a negative electrode active material capable of occluding/releasing lithium ion, a separator arranged between positive electrode and negative electrode, and an electrolyte solution having lithium ion conductivity. The negative electrode has a negative electrode collector having several convex portions on the surface, and a negative electrode active material layer containing several active material components formed on the collector. The active material components are arranged on each convex portion of the collector. The negative electrode active material is alloy-group active material containing silicon or tin. The battery further has a porous insulating layer containing inorganic oxide, provided between positive electrode and negative electrode.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of electrode group of lithium secondary battery.    Separator (13)    Porous insulating layer (15)    Negative electrode (20)    Negative electrode collector (21)    Convex portions (22)    Negative electrode active material layer (23)    Active material components (24)    Positive electrode (30)    Lithium secondary battery (100)