In this work, the oxygen‐vacancy abundant NiCo2O4 grown on the N‐doped carbon nanosheets are designed and fabricated through a facile procedure. The obtained special structure combined with the oxygen vacancies effectively enhance the contact area, keep the structural integrity as well as accelerate the electron and lithium ion transfer. As an anode for lithium ion batteries, the special architecture exhibits good cycle stability (1096 mAh g−1 after 100 cycles at current density of 200 mA g−1) and long cycle capability at high current rate (398 mAh g−1 after 500 cycles at 5000 mA g−1). The advantageous features by constructing oxygen‐vacancy abundant transition metal oxides with the conductive N‐doped carbon nanosheets may pave the way for improving the electrochemical performance.
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 CoFe2O4 and NiFe2O4 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@CoFe2O4 and NC@NiFe2O4 hybrids display improved cycle performances and rate capacities compared with CoFe2O4, NiFe2O4, and Fe2O3. The enhanced lithium storage performances of NC@CoFe2O4 and NC@NiFe2O4 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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.