A method of manufacturing an electrode assembly, the method comprising: a first step of forming one kind of a radical unit (110a-e) having an alternately stacked structure of a same number of electrodes and separators; and a second step of forming a cell stack part (100a-n) by repeatedly stacking the one kind of the radical units (110a-e), wherein an edge of the separator is not joined with an edge of an adjacent separator, wherein the one kind of radical unit (110a-e) has a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are sequentially stacked together, wherein the first electrode is made of a first electrode material, the first separator is made of a first separator material, the second electrode is made of a second electrode material and the second separator is made of a second separator material, wherein an adhesive or a porous coating layer is applied to a surface of the second separator to adhere the adjacent radical unit, said porous coating layer comprising a mixture of inorganic particles and a binder polymer binding and fixing the inorganic particles to each other, wherein adhesive strength between the radical units (110a-e) in the cell stack part (100a-e) is smaller than adhesive strength between the electrode (111, 113) and the adjacent separator (112, 114) in the radical unit (110a-e), wherein the first step of forming comprises the following sub steps: - cutting the first electrode material and the second electrode material, - stacking the first electrode material on the first separator material, - staking the second electrode material on the second separator material, - laminating the first electrode material, the first separator material, the second electrode material and the second separator material to be attached to each other, and then - cutting the first separator material and the second separator material to form the one kind of radical unit. a first step of forming one kind of a radical unit (110a-e) having an alternately stacked structure of a same number of electrodes and separators; and a second step of forming a cell stack part (100a-n) by repeatedly stacking the one kind of the radical units (110a-e), wherein an edge of the separator is not joined with an edge of an adjacent separator, wherein the one kind of radical unit (110a-e) has a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are sequentially stacked together, wherein the first electrode is made of a first electrode material, the first separator is made of a first separator material, the second electrode is made of a second electrode material and the second separator is made of a second separator material, wherein an adhesive or a porous coating layer is applied to a surface of the second separator to adhere the adjacent radical unit, said porous coating layer comprising a mixture of inorganic particles and a binder polymer binding and fixing the inorganic particles to each other, wherein adhesive strength between the radical units (110a-e) in the cell stack part (100a-e) is smaller than adhesive strength between the electrode (111, 113) and the adjacent separator (112, 114) in the radical unit (110a-e), wherein the first step of forming comprises the following sub steps: - cutting the first electrode material and the second electrode material, - stacking the first electrode material on the first separator material, - staking the second electrode material on the second separator material, - laminating the first electrode material, the first separator material, the second electrode material and the second separator material to be attached to each other, and then - cutting the first separator material and the second separator material to form the one kind of radical unit. - cutting the first electrode material and the second electrode material, - stacking the first electrode material on the first separator material, - staking the second electrode material on the second separator material, - laminating the first electrode material, the first separator material, the second electrode material and the second separator material to be attached to each other, and then - cutting the first separator material and the second separator material to form the one kind of radical unit.