| 摘要 |
Sodium ion batteries are based on sodium based active materials selected among compounds of the general formula A<SUB>a</SUB>M<SUB>b</SUB>(XY<SUB>4</SUB>)<SUB>c</SUB>Z<SUB>d</SUB>, wherein A comprises sodium, M comprises one or more metals, comprising at least one metal which is capable of undergoing oxidation to a higher valence state, Z is OH or halogen, and XY<SUB>4 </SUB>represents phosphate or a similar group. The anode of the battery includes a carbon material that is capable of inserting sodium ions. The carbon anode cycles reversibly at a specific capacity greater than 100 mAh/g.
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