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The NiCo2O4 ternary transition metal oxide (NCO) has been received a great interest as anode material for sodium-ion batteries, recently. Here we show that a composite material composed of NCO nanoparticles (NCO-NPs) and amorphous carbon (NCO/C composite) displayed a superior electrochemical performance over the NCO-NPs. The NCO-NPs delivered a capacity of 172 mAh g−1 at the current density of 50 mA g−1, and the capacity was reduced to 29 mAh g−1 after 50 cycles. The NCO/C composite showed a capacity of 213 mAh g−1 at 50 mA g−1; the capacity was lowered to 119 mAh g−1 after 100 cycles. The capacity of the composite at 100 mA g−1, 200 mA g−1 and 300 mA g−1 was ca. 123 mAh g−1, 93 mAh g−1 and 62 mAh g−1, respectively. This improvement is ascribed to the presence of the activated hard carbon of high electronic conductivity. Our work suggests that the combination of amorphous carbon with the NCO-NPs can serve as anodes for sodium-ion batteries. [ABSTRACT FROM AUTHOR]

P2-type layered structure manganese-based materials have been reported as the most promising candidates for practical applications of sodium ion batteries because of their high capacity, facile fabrication, low cost, and environmental friendliness. In this work, a new P2-type layered structure Na 1.0 Li 0.2 Mn 0.7 Ti 0.1 O 2 material was successfully synthesized by a conventional solid-state reaction method. The material delivered a superior specific capacity of 163 mAh g1 at 0.1C within the potential range from 1.5 to 4 V. The capacity and the coulombic efficiency of the material remained of 90% and 97% after 50 cycles of charge/discharge at a rate of 0.1C. The material also exhibited an excellent rate capability, with a discharge capacity of over 100 mAh.g−1 remained at a rate of 1.0C. The observed results suggested that Na 1.0 Li 0.2 Mn 0.7 Ti 0.1 O 2 is a promising cathode material for sodium ion batteries. • P2 - Na 1.0 Li 0.2 Mn 0.7 Ti 0.1 O 2 as a superb cathode material for sodium-ion batteries. • P2 - Na 1.0 Li 0.2 Mn 0.7 Ti 0.1 O 2 material was successfully synthesized by a conventional solid-state reaction method. • P2 - Na 1.0 Li 0.2 Mn 0.7 Ti 0.1 O 2 material delivers a superior specific capacity of 163 mAh g−1 at 0.1C. • P2 - Na 1.0 Li 0.2 Mn 0.7 Ti 0.1 O 2 material showed excellent rate capacity. [ABSTRACT FROM AUTHOR]