Electrochemical Li+ insertion capabilities of Na4−xCo3(PO4)2P2O7 and its application to novel hybrid-ion batteries†
Abstract
Electrochemically Na+-extracted Na4−xCo3(PO4)2P2O7 exhibits both Li+ and Na+ insertion capabilities. Given these compatibilities, novel hybrid-ion batteries were demonstrated by combining a Na4Co3(PO4)2P2O7 positive electrode and Li4Ti5O12 negative electrode in a lithium-based electrolyte.