| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve problems wherein when positive and negative plates are constituted in a conventional way in a lithium ion battery, since the surface area of the positive plate is required to make smaller than that of the negative plate, the capacity of the battery is decreased. <P>SOLUTION: In a lithium ion secondary battery, a porous film is formed on the surface of the positive plate and/or the surface of the negative plate and the porous film is comprised of inorganic oxide fillers which are main component and a binder, and by constituting the positive plate so as to have the width and/or length equal to or larger than the negative plate, the lithium ion secondary battery having high capacity and stability is obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT |
