A 3D network of carbon-coated SiO2 nanotubes on reduced graphene oxide for high-performance lithium-ion battery anodes

Abstract

We develop a novel 3D network-structured composite, denoted as rGO@C@SNT, wherein carbon-coated SiO₂ nanotubes (C@SNT) are integrated onto reduced graphene oxide (rGO). The synergistic effects of this composite provide both structural and interfacial stability during the lithiation/delithiation processes, while the carbon layer effectively improves mechanical stress and enhances conductivity. As a result, the rGO@C@SNT exhibits higher cyclic capacity, lower electrochemical impedance, and stronger charge transfer capability. Specifically, we show that the rGO@C@SNT composite maintains a high capacity of 826 mAh g^-1 after 200 cycles with a capacity retention rate of 100 %. The unique 3D network enhances the mobility of Li⁺ ions and electrons, and provides the contact between the electrolyte and the active sites, thereby improving the battery performance. These findings underscore the significant potential of the rGO@C@SNT composite in advancing LIBs technology, offering a sustainable solution for next-generation energy storage systems.