| abstract |
The present invention provides a power storage device having a reduced initial irreversible capacity. A positive electrode having a positive electrode current collector and a positive electrode active material layer, a negative electrode having a negative electrode current collector and a negative electrode active material layer, and an electrolyte, and the negative active material layer has a Raman shift of 1360 cm -1 in the Raman spectrum observed by Raman spectroscopy. The ratio of the peak intensity I 1580 at I 1360 to the Raman shift 1580 cm -1 is less than 2 wt %, and the content of the carbon material having an R value of 1.1 or more, which is I 1360 / I 1580, is less than 2 wt %, and the electrolyte is composed of lithium ions, anions and organic cations. It is a power storage device containing an ionic liquid. |