| abstract |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery that has a small number of stacked electrodes and is easy to manufacture and has high safety when manufacturing a large battery having a capacity of 5 Ah or more. A lithium ion secondary battery of the present invention includes one positive electrode and one negative electrode, and a mixture of a positive electrode active material, a conductive agent, and a binder has an electric resistivity of 0. The capacitance is 1 Ωcm or more and 1 Ωcm or less, and the capacitance per rectangular parallelepiped is 10 mAh or more and 50 mAh with both the positive electrode and the negative electrode having a square of 1 cm 2 as the bottom and the thicknesses of the positive electrode and the negative electrode are respectively high. With such a configuration, a lithium-ion secondary battery having a large capacity and excellent safety can be easily provided. [Selection] Figure 1 |