TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Battery: In the lithium ion secondary battery above, the electrolytic solution further includes a third electrolytic solution that is stored between the power-generating element and the battery case in a state in which the third electrolytic solution fluidly communicates with the second electrolytic solution; and the third electrolytic solution has a lithium ion concentration that is equal to or higher than that of the second electrolytic solution prior to the use of the lithium ion secondary battery. The second electrolytic solution is disposed at both the positive electrode exposed portion and the negative electrode exposed portion. The second electrolytic solution has a lithium ion concentration higher than that of the first electrolytic solution prior to the first charging and discharging in the use of the lithium ion secondary battery after its manufacture. The second electrolytic solution has a lithium ion concentration higher than that of the first electrolytic solution prior to the first charging and discharging the lithium ion secondary battery at a high-rate current after its manufacture. Preferred Method: Manufacturing method includes impregnating the separator with the first electrolytic solution and disposing the first electrolytic solution, and then disposing the second electrolytic solution. The method further comprises injecting a third electrolytic solution having a lithium ion concentration of equal to or higher than the lithium ion concentration of the second electrolytic solution into the battery case, and storing the third electrolytic solution between the power-generating element and the battery case in a state in which the third electrolytic solution fluidly communicates with the second electrolytic solution. A fourth electrolytic solution having a lithium ion concentration higher than that of the first electrolytic solution is used as the third electrolytic solution and the second electrolytic solution. The method also comprises injecting the second electrolytic solution into the battery case before disposing the second electrolytic solution; and storing, between the power-generating element and the battery case, the second electrolytic solution other than the second electrolytic solution disposed in contact with at least either of the positive electrode exposed portion and the negative electrode exposed portion after disposing the second electrolytic solution.