Oxygen-Vacancy-Abundant Ferrites on N-Doped Carbon Nanosheets as High-Performance Li-Ion Battery Anodes

Transition metal oxides, as one of the most promising anode materials for lithium-ion batteries, often suffer from poor electronic conductivity and serious structural collapse. In this work, oxygen-vacancy-abundant CoFe(2)O(4)and NiFe(2)O(4)deposited on N-doped carbon nanosheets are designed and fabricated through a calcination procedure and a solvothermal strategy using Zn-hexamine coordination frameworks as precursors. The as-prepared NC@CoFe(2)O(4)and NC@NiFe(2)O(4)hybrids display improved cycle performances and rate capacities compared with CoFe2O4, NiFe2O4, and Fe2O3. The enhanced lithium storage performances of NC@CoFe(2)O(4)and NC@NiFe(2)O(4)are attributed to the oxygen vacancies and conductive N-doped carbon nanosheets, which increase the electronic conductivity and electrochemical reaction kinetics. The synthetic process in this work provides a new perspective for designing other high-performance transition metal oxide anodes.