LITHIUM SECONDARY BATTERY AND SEPARATOR

A lithium secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. At the negative electrode, lithium metal deposits during charging, and the lithium metal dissolves during discharging. The separator has an elongated shape having a length D in a first direction and a length D in a second direction perpendicular to the first direction, where D