In situ construction of bamboo charcoal derived SiO_x embedded in hierarchical porous carbon framework as stable anode material for superior lithium storage

摘要

Ongoing pursuit of high performance functional materials from natural and inexpensive resources receive continuous attention. 3D porous SiO_x/C composites are constructed only from commercial bamboo charcoal via an in situ top-down synthetic route involving activated carbonization and mild aluminothermic reduction. Particularly, the obtained composites possess a well-reserved porous and hierarchical structure where SiO_x nanoparticles are embedded in the entire 3D carbon framework. When used as the active material for lithium-ion battery anode, the optimized SC-3 sample achieves the impressive specific capacity (1100mAhg~(-1) at 200 mA g~(-1) after 300 cycles, as well as prominent cyclic stability under 1 A g~(-1) (700 mA h g~(-1) after 200 cycles). Besides, this SiO_x/C anode demonstrates perfect capacity retentions and superior cyclic stability in full cells. This low cost bamboo-derived composite can further broaden the vision of advancing new-generation anode materials for rechargeable batteries and the related hierarchical composites.