| 摘要 |
<p> Provided is a power storage device having high energy density, low resistance, and high durability. A power storage device provided with: an electrode unit in which a positive electrode on which a positive-electrode active-substance layer is formed and a negative electrode on which a negative-electrode active-substance layer is formed are layered in alternating fashion interposed by a separator, and an electrolyte made from an aprotic organic solvent electrolyte solution of a lithium salt. The expressions 0.35≤a/b≤0.95, 0.55≤b/c≤1.00, and 0.35≤a/c≤0.55 hold, where a is the cell capacity (mAh) when the power storage device is discharged from a fully charged state to a voltage that is half the fully charged voltage in 0.75 to 1.25 hours, b is the full negative-electrode capacity (mAh) when the negative electrode in the fully charged state is discharged to the point at which the negative electrode potential reaches 1.5 V (Li/Li+), and c is the total negative-electrode charge capacity (mAh) when the negative electrode at 0V is subjected to constant current, constant voltage (CCCV) charging over 12 hours. The electrode density of the positive-electrode active-substance layer is 0.54-0.7 g/cm3, and the electrode weight of the positive-electrode active-substance layer is 70-110 g/m2.</p> |
