Silicon‐Based Nanorod Anodes by Employing Bacterial Cellulose Derived Carbon Skeleton Towards Lithium‐Ion Batteries

Abstract Huge volume change and high cost of silicon (Si) during the lithium insertion/extraction processes are still major challenges in practical application of Li‐ion batteries (LIBs). Herein, for the first time, a scalable one‐dimensional (1D) robust Si/C nanorods are developed by using pyrolytic bacterial cellulose (pBC) as 1D carbon skeleton and introducing carbon dioxide (CO 2 ) greenhouse gas into traditional magnesiothermic reduction reaction, to accelerate the commercial utilization of Si/C composite electrodes. pBC arrays are generated via a self‐assembled parallel arrangement process in the SiO 2 /pBC hybrids. Notably, pBC arrays as a strong structural support and CO 2 ‐derived in‐situ generated amorphous carbon as an ideal encapsulation endow Si/C nanorods with high structure robustness and good electronic conductivity. In particular, Si‐based nanorods anodes with carbon component content of 11 wt % deliver high reversible specific capacity, good Coulombic efficiency and impressive cycling performance. Such excellent electrochemical performance is attributed to unique Si/C nanorod structure and its superior properties, which can provide good accommodation of volume changes, superior electrolyte wetting, and fast electrons and lithium ions transportation pathways during charging and discharging processes.