LITHIUM SECONDARY BATTERY

A lithium secondary battery including a wound electrode group and a non-aqueous electrolyte. A positive electrode includes a positive electrode mixture layer containing a positive electrode active material and a positive electrode current collector. The positive electrode active material includes a composite oxide containing lithium and a transition metal. A molar ratio: MLi/MTM of a total lithium amount per unit area MLi in the positive electrode and a negative electrode to a transition metal amount per unit area MTM in the positive electrode is 1.1 or less. The negative electrode includes a negative electrode current collector larger in area than the positive electrode mixture layer. In the wound electrode group in an unwound state, a center line dividing the positive electrode mixture layer along a winding direction into two halves and a center line dividing the negative electrode current collector along the winding direction into two halves are not on the same straight line. The negative electrode lead is connected at its one end to a non-facing region not facing the positive electrode mixture layer of the negative electrode current collector.