Porous Mn-doped Fe3O4 as lithium-ion battery anode via low-temperature combustion synthesis

The preparation of Mn-doped Fe3O4 was carried out using the low-temperature combustion synthesis (LCS) method through the addition of Mn2+ to the ferric nitrate-glycine system. Here, we investigate the mechanism of the redox reaction involving Fe3+ and Mn2+ ions, and the results reveal that for the synthesis of porous Mn-doped Fe3O4, the presence of Mn2+ in the raw material is necessary. The carbon source, such as ethylene glycol, glucose, and polyethylene glycol-4000, serves as both reducing and complexing agent, leading to the formation of more pores during the combustion reaction. Increased specific surface area of combustion products. By conducting a LCS reaction in a solution with added ethylene glycol, Mn-doped Fe3O4 was obtained for lithium ions batteries as anode material, at current density of 5 A g−1, it demonstrates an impressive capacity retention rate of 90% with a high capacity of 452.5 mA h g−1 after 650 cycles. Similarly, Mn-doped Fe3O4 obtained with the addition of polyethylene glycol shows a capacity retention rate of 89.7% after 1500 cycles. Our findings provide a new and innovative method for the preparation of manganese ferrites with a porous structure and a new research approach for developing metal oxide anode materials.