Cubic KTi2(PO4)3 as electrode materials for sodium-ion batteries

A novel cubic KTi 2 (PO 4 ) 3 is successfully synthesized via a facile hydrothermal method combined with a subsequent annealing treatment and further used as electrode material for sodium-ion batteries for the first time. For comparison, carbon-coated KTi 2 (PO 4 ) 3 obtained by a normal cane sugar-assisted method reveals superior electrochemical performances in sodium-ion battery. Besides of the high coulombic efficiency of nearly 100% after 100 cycles, a stable capacity of 112   mA   h   g −1 can be achieved at 0.5   C after 100 cycles, and still maintains to 105   mA   h   g −1 after 500 cycles with capacity retention of approximately 90%.