Oxygen-deficient NiMoO4-xSx nanosheets perpendicularly grown on N-doped carbon nanosheets for high performance lithium-ion batteries

Abstract The ordered nanostructural arrays on conductive matrix and oxygen vacancies for improving the electrochemical performance of lithium-ion batteries (LIBs) are attracted considerable attention. In this work, the ordered ultrathin NiMoO4-xSx nanosheets with oxygen vacancies on N-doped carbon nanosheets (NC@NiMoO4-xSx) are designed and synthesized through a facile hydrothermal procedure. The resulting nanostructures with strong Mo–N chemical bonding combined with the oxygen vacancies can enhance the electroactive surface sites, maintain the structural integrity, and facilitate the electron and lithium ion transfer across the interface. The electrochemical studies demonstrate that the as-developed NC@NiMoO4-xSx displays the reversible capacity of 980 mAh g−1 after 100 cycles at 100 mA g−1 and a reversible capacity of 644 mAh g−1 after 500 cycles even at high rate of 5000 mA g−1. The proposed cooperation of oxygen vacancies and the ordered nanostructural arrays on carbon nanosheets may pave the way for designing the high performance electrodes for LIBs.