LAUSR

Abstract In this research, a novel integrated nanomatrix was synthesized via a smart combination of Co 3 O 4 nanoshell and CuO nanocore using an environmentally friendly and cost-effective sol–gel method. The performance of the samples in lithium-ion batteries (LIBs) was evaluated. The synergetic effect of intelligent integration, well interaction between Co 3 O 4 and CuO, good dispersion, surface modification, controlled morphology, and decoration of the crystallite surfaces by using of metals and metal oxides can result in unique Co 3 O 4 –CuO (MʹO–MʺO) nanomatrix with a morphology similar to core–shell structure as anode material that exhibits enhance electrochemical performance. However, this core–shell structure can be demonstrated as CuO@Co 3 O 4 . As far as we know, the heterostructure of CuO@Co 3 O 4 has not been reported so far. For this new nanostructure, low initial irreversible loss (initial Coulombic efficiency of 96% at a current density of 0.05 A g −1 ), specific capacity of 93.7% of initial capacity after cycling at high current rates and turning back to the initial current density are very noticeable. So MʹO–MʺO nanomatrix could be deemed to act as a promising alternative anode material in LIBs with commercial applications. Graphic abstract