Synthesis of CoMn2O4 thin films on Ni foams by electrostatic spray deposition as anodes for sodium–ion batteries

CoMn 2 O 4 films on nickel foam were successfully synthesized by electrostatic spray deposition method followed by annealing in Ar atmosphere for sodium–ion battery anodes. The CoMn 2 O 4 film exhibits porous architecture with a pore size of around 3–4 µm. The CoMn 2 O 4 electrode as a binder-free anode exhibits superior reversible cycling performance and rate capability. It remains reversible specific capacity of 185 mAh g −1 at 100 mA g −1 after 50th cycle. The stable electrochemical performance could be attributed to the unique CoMn 2 O 4 architecture on Ni foam, which could provide high contact area with electrolyte, pronounced tolerance to volume variation, and enhance the electrical conductivity.