| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery enhancing input and output characteristics and charge discharge cycle characteristics while suppressing as small as possible the drop in the capacity. <P>SOLUTION: The lithium ion secondary battery has a positive electrode in which a positive mix layer is composed of at least two layers, in a layer coming in contact with a current collector out of layers constituting the positive mix layers, when the total of an active material and a conductive auxiliary is made 100 mass%, the content (A) of the conductive auxiliary is made 10-80 mass%, and in any of layers other than the layer coming in contact with the current collector out of layers constituting the positive mix layer, when the total of the active material and the conductive auxiliary is made 100 mass%, the content (B) of the conductive auxiliary is made 1-15 mass%, and the relation between the content (A) and the content (B) of the conductive auxiliary is made into (A)>(B). <P>COPYRIGHT: (C)2008,JPO&INPIT |
