Organic electrolyte capacitor

An organic electrolyte capacitor comprising:

• a positive electrode,
• a negative electrode, and
• an electrolyte capable of transporting lithium ions, wherein
• the positive electrode is able to support lithium ions and anions reversibly;
• the negative electrode is able to support the lithium ions reversibly;
• wherein the organic electrolyte capacitor having a cell capacity X (mAh) when in a charged state is discharged to half a charging voltage over 1 ±0.25 hours, and having a full negative electrode capacity Y (mAh) that is a capacity when the negative electrode in the charged state is discharged to 1.5 V (Li/Li+);
• and
• wherein a ratio of a positive electrode active material to a negative electrode active material being controlled to be within a range 0.05 ≦X/Y ≦0.3.