Rigid and Flexible Component Combined Si@g-C<sub>3</sub>N<sub>4</sub>/C: A Synergistic Strategy for Constructing Robust Structure to Enhance the Cyclic Stability of the Silicon Anodes
Yuanjiang Dong, Fei Li, Dan An, Huacheng Jin, Baoqiang Li, MA Xiao-hong, Vien Vo, Dai Lam Tran, Fangli Yuan
Abstract
The practical application of high-capacity silicon is hindered by severe volume variation during cycling. Herein, a synergistic strategy integrating rigid and flexible components is proposed to construct a Si@g-C 3 N 4 /C composite with a robust structure. The rigid component, glucose-derived carbon, forms an outer protective layer and an inner conductive network, avoiding direct electrolyte contact and providing sufficient conductivity. The embedded flexible component, g-C 3 N 4, further enhances the deformation resistance (mechanical properties) of the composite and maintains the structure’s stability. Si@g-C 3 N 4 /C maintains a reversible capacity of 722.8 mAh g –1 after 150 cycles at 0.2 A g –1 and 478.2 mAh g –1 after 600 cycles at 1 A g –1, with capacity retentions of 80.4% and 98.5%, respectively. It can still release a reversible capacity of 174.1 mAh g –1 at 3 A g –1 . These results demonstrate that the synergistic combination strategy of rigid and flexible components significantly enhances the electrochemical performance of Si-based anodes.