| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery having a high capacity and excellent cycle characteristics and productivity, without causing a capacity drop due to the breakage of an electrode plate in a process to apply compression molding to a group of flat type electrodes having a group constitution, and the breakage of the electrode plate during the repetition of charge and discharge, while the nonaqueous electrolyte secondary battery is equipped with a group of flat type windings comprising a linear portion and a curved portion which are composed of positive and negative electrodes containing active materials capable of reversibly occluding and releasing an lithium ion, and a separator, and a nonaqueous electrolyte. <P>SOLUTION: Before winding the positive electrode, the negative electrode, and the electrolyte to form a group of electrodes, a solvent is brought into contact with a portion corresponding to the curved portion of the positive electrode plate, and the positive electrode plate density of the curved portion is made lower than that of the straight line portion. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
