P2-type Na0.67Co0.35Ti0.20Mn0.44La0.01O2 cathode material with high-rate capability for sodium-ion batteries

Abstract The substitution of elements has attracted great interest to enhance the electrochemical properties of sodium-ion batteries (SIBs). Herein, the P2-Na 0.67 Co 0.35 Ti 0.20 Mn 0.45– x La x O 2 electrode samples were prepared via a solid-state route. The effect of La 3+ substitution was researched as high-rate SIBs cathode. The Na 0.67 Co 0.35 Ti 0.20 Mn 0.44 La 0.01 O 2 exhibits a superior initial specific capacity of 162.7 and 125.9 mAh/g after 50 cycles at 0.1 C rate, and the initial specific discharge capacity of 115.2 mAh/g with 60.6% capacity retention after 100 cycles at 1 C. In addition, the Na 0.67 Co 0.35 Ti 0.20 Mn 0.44 La 0.01 O 2 sample shows an excellent rate capacity of 91.9 and 60.4 mAh/g with 46.9% and 50.9% capacity retentions even at 8 C and 10 C rate after 100 cycles, respectively. The promising La-substituted P2-type Na 0.67 Co 0.35 Ti 0.20 Mn 0.45– x La x O 2 material provides a new strategy for designing high-rate performance of SIBs.