Hierarchical carbon nanocages as high-rate anodes for Li- and Na-ion batteries

摘要: Novel hierarchical carbon nanocages (hCNCs) are proposed as high-rate anodes for Li- and Na-ion batteries. The unique structure of the porous network hCNCs greatly favors electrolyte penetration, ion diffusion, electron conduction, structural stability, resulting in high rate capability excellent cyclability. For lithium storage, corresponding electrode stores a steady reversible capacity 970 mAh·g−1 at 0.1 A·g−1 after 10 cycles, stabilizes 229 10,000 cycles 25 (33 s full-charging) while delivering large specific power $$37 kW \cdot kg_{electrode^{ - 1} }$$ energy $$339 Wh . sodium hCNC reaches discharge ∼50 even A·g−1.