| abstract |
Sodium ion batteries have the general formula A a M b (XY 4 ) c Z d (wherein A contains sodium, M contains one or more metals, and one or more metals can be oxidized to a higher valence state). Z is OH or halogen and XY 4 represents a phosphate or similar group). The anode of the battery contains a carbon material capable of inserting sodium ions. Carbon anodes reversibly cycle at specific capacity in excess of 100 mAh / g. |