摘要 |
PROBLEM TO BE SOLVED: To provide a homogeneous lithium ion secondary battery free from a limit due to the size of a solid electrolyte film as well as free from the leakage of an electrolyte by applying the constitution that a positive electrode or a negative electrode is immersed in a solid electrolyte solution and dried, and housed in a battery can in a state that the positive and regative electrodes are superposed each other via the solid electrolyte film formed on the surface thereof. SOLUTION: At least one of a positive electrode and a negative electrode is immersed in a solid electrolyte solution and dried, thereby forming a solid electrolyte film thereon. The positive electrode is prepared by depositing a positive electrode active material such as LiCoO2 on a reticular current collector made, for example, of aluminum. Also, the negative electrode is formed out of a current collector made of copper or the like, and a negative electrode active material such as coke. Furthermore, the solid electrolyte solution is prepared by dissolving a solid electrolyte such as polyethylene oxide in a volatile solvent of acetonitrile or the like. The positive electrode 1 and the negative electrode 2 are stacked interposing the solid electrotype film 3 formed on the surface thereof and housed in a negative electrode can 4 in a wound state. In addition, the positive electrode 1 and the negative electrode 2 are connected to a positive electrode terminal 5 and the negative electrode can 4 respectively and sealed, thereby providing a lithium ion secondary battery. |