Silicon‐Based Nanorod Anodes by Employing Bacterial Cellulose Derived Carbon Skeleton Towards Lithium‐Ion Batteries
Jie Wang, Jiafeng Gao, Jian Zhang, Qiwen Jiang, Huanhuan Yin, Ziqi Wang, Songlin Zuo
Abstract
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.