NOVELTY - A lithium secondary battery comprises a wound electrode assembly (5) comprising an anode having a layer containing an active material capable of intercalating and de-intercalating lithium, a cathode having a cathode current collector and an active-material layer, a separator having a penetration resistance of 500 g or more, a cylindrical hollow space (14), and a columnar center pin (15). The anode, cathode and separator are spirally-wound. The cathode active material has a filling density of 2 g/cc or less and is capable of alloying with lithium.    USE - Lithium secondary battery is used as power source for mobile information terminal devices, such as mobile telephones, notebook computers, and personal digital assistants, power tools, electric automobiles, and hybrid automobiles.    ADVANTAGE - The lithium secondary battery achieves high battery capacity by using a cathode active material which expands largely and at the same time improves cycle performance. The polyvinylidene fluoride used as cathode binder causes less load on the cathode current collector and has appropriate adhesion capability.    DETAILED DESCRIPTION - A lithium secondary battery comprises a wound electrode assembly (5) comprising an anode having a layer containing an active material capable of intercalating and de-intercalating lithium, a cathode having a cathode current collector and an active-material layer formed on both sides of the collector, a separator disposed between the anode and cathode and having a penetration resistance of 500 g or more, a cylindrical hollow space (14) disposed at a winding axis of the wound electrode assembly and in the vicinity, and a columnar center pin (15) disposed in the hollow space and having a diameter of 75-95% of the diameter of the hollow space. The anode, cathode and separator are spirally-wound. The cathode active material has a filling density of 2 g/cc or less and is capable of alloying with lithium. The cathode active material contains tin and amorphous carbon as conductive agent. The amorphous carbon comprises acetylene black or Ketjen Black. The cathode active-material layer contains cathode binder comprising polyvinylidene fluoride. The cathode current collector comprises foil of copper, nickel, iron, titanium, cobalt, and/or their alloys, preferably copper (alloy) foil.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the wound electrode assembly.    Wound electrode assembly (5)    Cylindrical hollow space (14)    Columnar center pin (15)