| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of improving output characteristics of a storage element and improving cycle characteristics.SOLUTION: An electric storage element comprising a positive electrode and a negative electrode. The negative electrode has graphite and non-graphitizable carbon. The D50 particle diameter of the hardly graphitized carbon having a cumulative volume of 50% in the particle size distribution of the particle size is 2 μm to 8 μm. The D50 particle diameter of graphite having a cumulative volume of 50% in the particle size distribution of the particle size is 2 μm or more. The ratio of the mass of the graphite to the total amount of the non-graphitizable carbon and the mass of the graphite is 5 mass% to 45 mass%. The ratio of the D50 particle size of graphite to the D50 particle size of hardly graphitized carbon is 1.02 or less.SELECTED DRAWING: Figure 1 |
