Abstract: A lithium secondary battery includes an electrode assembly including a cathode and an anode facing the cathode, a case accommodating the electrode assembly, an electrolyte accommodated in the case together with the electrode assembly, and an electrolyte storage unit inserted into the case to supply a supplementary replenishment. The electrolyte storage unit includes a first unit including a first body having a tubular structure and first holes formed through the first body, and a sub-unit including a tubular body and sub-holes formed through the tubular body. The sub-unit is inserted into the first unit so that the sub-holes are offset from the first holes.

Abstract: An electrode structure for a secondary battery includes a current collector, a first active material layer formed on at least one surface of the current collector, a second active material layer on the first active material layer, and a conductive intermediate layer interposed between the first active material layer and the second active material layer. The conductive intermediate layer has a resistance lower than each resistance of the first active material layer and the second active material layer. A lithium secondary battery including the electrode structure is provided.