Two-dimensional SiOx/Nitrogen-Doped carbon derived from in situ constructed Siloxene/Polyaniline for robust lithium storage

Silicon oxides (SiOx) have been widely recognized as a highly potential material for anodes in advanced lithiumion batteries due to their remarkable reversible capacity. Nonetheless, the commercial utilization of SiOx anodes is still impeded by their low inherent electrical conductivity and substantial volumetric fluctuations. Herein, a layer-by-layer structure, composited of two-dimensional (2D) SiOx and nitrogen-doped carbon, is fabricated as a robust lithium-ion battery anode via the thermal pyrolysis of in situ formed siloxene/polyaniline. Nitrogen-doped carbon is distributed across both the interlayer and surface of 2D SiOx, yielding the composite anode with a stable electrode interface, superior structural integrity, and enhanced electrical conductivity. Therefore, the optimized 2D SiOx/nitrogen-doped carbon anode presents high reversible capacity (957.8 mAh/g at 0.1 A/g), ideal rate capability, and excellent cycling performance (696.4 mAh/g after 300 cycles at 1.0 A/g and 217.5 mAh/g over 1000 cycles at 5.0 A/g). This work provides a novel and simple approach to making 2D SiOx anodes hybridize with carbonaceous materials for lithium-ion batteries.