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

A novel cubic KTi2(PO4)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 KTi2(PO4)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%.

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