Hollow\nCarbon-Nanotube/Carbon-Nanofiber Hybrid Anodes\nfor Li-Ion Batteries

Abstract

By a novel <i>in situ</i> chemical vapor deposition,\nactivated N-doped hollow carbon-nanotube/carbon-nanofiber composites\nare prepared having a superhigh specific Brunauer–Emmett–Teller\n(BET) surface area of 1840 m² g^–1 and\na total pore volume of 1.21 m³ g^–1. As\nan anode, this material has a reversible capacity of ∼1150\nmAh g^–1 at 0.1 A g^–1 (0.27 C)\nafter 70 cycles. At 8 A g^–1 (21.5 C), a capacity\nof ∼320 mAh g^–1 fades less than 20% after\n3500 cycles, which makes it a superior anode material for a Li-ion\nbattery .