Lithium secondary battery

A lithium secondary battery including: a positive electrode including a positive electrode active material layer; a negative electrode including a negative electrode active material layer; an electrolyte; and an inorganic insulating separator coating layer coated on at least one of the active material layers. The sizes and shapes of the positive electrode active material layer and the negative electrode active material layer are substantially the same, in order to facilitate an arrangement of the positive and negative electrodes.