Site-dependent electrochemical performance of Na and K co-doped LiFePO ₄ /C cathode material for lithium-ion batteries

In this study, Na and K co-doped LiFePO ₄ /C samples with controlled Na and K sites, i.e. , the Li 1−x−y Na x K y FePO ₄ /C and LiFe 1−x−y Na x K y PO ₄ /C ( x = 0.02, y = 0.01) have been first synthesized via a common solid-state synthesis and the effects of the alien metal occupied site on the structure, morphology and electrochemical performance of LiFePO ₄ /C are studied.