| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion capacitor having a low resistance and a high energy density. <P>SOLUTION: The lithium ion capacitor comprises a positive electrode, a negative electrode having a negative electrode active material layer and an electrolytic solution. The negative electrode contains 4-20 mass% of Ketjen black for 100 mass% of negative electrode active material layer. The negative electrode contains graphite having 50% volume cumulative diameter (D50) in the range of 1.0-10 μm, and the positive electrode potential after short-circuiting the positive electrode and negative electrode is 2.0 V or lower. <P>COPYRIGHT: (C)2012,JPO&INPIT |
