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

Abstract

Silicon oxides (SiOx) have been widely recognized as a highly potential material for anodes in advanced lithium-ion 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.