Dong Yuanjiang, Li Fei, An Dan, Jin Huacheng, Li Baoqiang, Ma Xiaohong, Vo Vien, Tran Dai Lam, Yuan Fangli
State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, P. R. China.
College of Chemical Engineering, University of Chinese Academy of Sciences (UCAS), Beijing 100049, P. R. China.
Nano Lett. 2025 Jun 25;25(25):10044-10052. doi: 10.1021/acs.nanolett.5c01803. Epub 2025 Jun 15.
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-CN/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-CN, further enhances the deformation resistance (mechanical properties) of the composite and maintains the structure's stability. Si@g-CN/C maintains a reversible capacity of 722.8 mAh g after 150 cycles at 0.2 A g and 478.2 mAh g after 600 cycles at 1 A g, with capacity retentions of 80.4% and 98.5%, respectively. It can still release a reversible capacity of 174.1 mAh g at 3 A g. These results demonstrate that the synergistic combination strategy of rigid and flexible components significantly enhances the electrochemical performance of Si-based anodes.
高容量硅的实际应用受到循环过程中严重体积变化的阻碍。在此，提出了一种整合刚性和柔性组件的协同策略，以构建具有坚固结构的Si@g-CN/C复合材料。刚性组件，即葡萄糖衍生碳，形成外层保护层和内层导电网络，避免与电解质直接接触并提供足够的导电性。嵌入的柔性组件g-CN进一步增强了复合材料的抗变形能力（机械性能）并维持结构的稳定性。Si@g-CN/C在0.2 A g下循环150次后保持722.8 mAh g的可逆容量，在1 A g下循环600次后保持478.2 mAh g的可逆容量，容量保持率分别为80.4%和98.5%。在3 A g下它仍能释放174.1 mAh g的可逆容量。这些结果表明，刚性和柔性组件的协同组合策略显著提高了硅基负极的电化学性能。
