High-performance heterostructure Na0.7MnO2.05–Na0.91MnO2 as a lithium-free cathode for lithium-ion batteries.

In this investigation, a lithium-free cathode material, Na_0.7MnO_2.05–Na_0.91MnO₂, was synthesized by the solid phase method. The intercalation mechanism and partial phase transformation mechanism of NMO600 were clarified by in situ X-ray diffraction and impedance. The design of the heterostructure is favourable for improving the lithium ion storage of NMO600, which can deliver a discharge capacity of 83.12 mA h g⁻¹ at 1 A g⁻¹ and keep 61.71 mA h g⁻¹ after 700 cycles. [ABSTRACT FROM AUTHOR]