Ternary transition metal oxide derived from Prussian blue analogue for high-performance lithium ion battery

A novel ternary transition metal oxide (TTMO) FeMnO₃ microcube with an average diameter of about 1.0 μm was successfully fabricated via the pyrolysis of Mn-Fe Prussian blue analogue (PBA) at 650 °C. As an anode material for lithium ion batteries (LIBs), it showed a steady reversible capacity of 710 mAh g⁻¹ at a high current density of 1 A g⁻¹ after 200 cycles with 80% retention. The remarkable electrochemical storage properties are attributed to the microcubic structure inherited from the precursor and structure stability, which can effectively buffer the volume expansion during the discharge-charge process. Its excellent features, such as low cost, environmentally friendliness, simple preparation and outstanding electrochemical properties, make the obtained FeMnO₃ a promising electrode material for electrochemical storage devices.