Abstract
Three-dimensional (3D) porous CoMn2O4 thin films on nickel foam substrates were successfully prepared via electrostatic spray deposition (ESD) technique and then an annealing process for lithium-ion battery anodes. The CoMn2O4 thin films exhibited high initial coulombic efficiency of 90% and excellent cycling performance with a reversible capacity of over 1366 mAh g−1 after 100 cycles at a current density of 400 mA g−1. The improved electrochemical performances are attributed to the synergistic advantages of 3D porous CoMn2O4 film and the Ni foam collector, which can provide effective void space to the large volume change during cycling, enhance reaction sites, and improve the electron transport. The ESD technique is facile and cost-effective and can be used as a promising method to synthesize 3D porous mixed transition-metal oxides materials.
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