A high-capacity self-sacrificial additive based on electroactive sodiated carbonyl groups for sodium-ion batteries.

A new type of high-capacity sacrificial additive (Na4C6O6) is proposed to replenish the sodium loss in sodium ion full-cells. The HC//Na3V2(PO4)2F3 full-cells demonstrate significantly enhanced energy density after introducing an appropriate amount of additive. [ABSTRACT FROM AUTHOR]