Nanogravel structured NiO/Ni foam as electrode for high-performance lithium-ion batteries

摘要: Nanogravel structured NiO/Ni electrodes were fabricated by using two-step thermal oxidation method of commercial nickel (Ni) foam in air for lithium-ion batteries (LIBs). The macro- and micro-structures the characterized X-ray diffraction (XRD), scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM-EDX), Raman spectroscopy. Galvanostatic tests revealed that electrode exhibits no obvious capacity fading over 40 cycles at 1 C (718 mAg−1) 2.5 C (1.8 Ag−1) current rate. discharge was higher than theoretical NiO even a high-current rate 2.5 C. can deliver reversible 1116.65 mAh g−1 after 20th cycle 1026.20 mAh g−1 40th cyclic voltammograms impedance spectra analysis indicated redox reaction NiO–Ni0 formation decomposition Li2O. excellent electrochemical performance is mainly attributed to nanogravel structure as well its electrical contact between Ni. unique nanostructured on highly conductive metallic Ni core resulted enhanced capacity, coulombic efficiency, stability, capability when utilized negative LIBs.