LITHIUM SECONDARY BATTERY

A lithium secondary battery with a positive electrode active material including a composite oxide containing lithium and a transition metal. A molar ratio: M/Mof a total lithium amount per unit area Min a positive electrode and a negative electrode to a transition metal amount per unit area Min 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, center lines dividing the positive electrode mixture layer and the negative electrode current collector along their 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.