High-performance anode of the orthorhombic Fe₂N thin film used for lithium-ion batteries

The Fe₂N thin film has initially been fabricated by a thermodynamic nonequilibrium process and utilized as the anode material of lithium-ion batteries (LIBs). Its crystal structure has been identified as the orthorhombic lattice with the space group of P 2₁2₁2. Superior battery performances such as high specific capacity and high cycling stability are realized by the orthorhombic Fe₂N thin-film anode owing to its larger surface roughness and higher defect density. The rate capability and CV curves individually confirm its high structural stability and high electrochemical reversibility. Moreover, the pseudocapacitance-controlled charge-discharge process involves the Li⁺ intercalation/deintercalation and the conversion reaction. A potential for the battery application is exhibited by the orthorhombic Fe₂N thin-film anode. The thermodynamic nonequilibrium process assisted by the N₂ plasma could be applied to fabricate more functional materials for various device applications.