LAUSR

Abstract Nanoarrays have aroused great concern in boosting the cyclic stability of lithium-ion batteries because of their prominent superiorities in shortening diffusion path of Li+ ions, and resolving disadvantages of poor anchor ability of active materials. Herein, bilateral nanoarrays self-supporting electrode composed of Coca-Cola-based N-doped caramel sheathed NiCo2O4/Co3O4/Al2O3 in-situ anchored on Ni foam substrate was synthesized via microwave-assisted method. The morphologies of the inner and outer sides of Ni foam substrate are different. The in-situ formation of bilateral nanoarrays not only causes dissolution of interlayer to ingeniously form NiCo2O4, but also reinforces adhesion. Coca-Cola-based unique N-doped micro-mesoporous caramel is used for the first time to boost electrochemical performance. Specifically, the carbon/binder free bilateral nanoarrays electrode composed of Coca-Cola-based caramel sheathed NiCo2O4/Co3O4/Al2O3 possess a high reversible capacity (1.28 mA h cm−2 at 0.5 mA cm−2 for 200 cycles), exhibit ultra-stable and high rate cyclic stability (0.27 mA h cm−2 at 4 mA cm−2 over 2500 cycles, and 0.25 mA h cm−2 at a high rate of 6 mA cm−2 over 1500 cycles). This work proposes a rational strategy to enhance electrochemical performance for hybrid oxides self-supporting electrode.