Hollow Carbon-Nanotube/Carbon-Nanofiber Hybrid Anodes for Li-Ion Batteries
Yuming Chen(The University of Texas at Austin), Xiaoyan Li(Hong Kong Polytechnic University), Kyusung Park(The University of Texas at Austin), Jie Song(The University of Texas at Austin), Jianhe Hong(The University of Texas at Austin), Limin Zhou(Hong Kong Polytechnic University), Yiu‐Wing Mai(University of Technology Sydney), Haitao Huang(Hong Kong Polytechnic University), John B. Goodenough(The University of Texas at Austin)
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Abstract
By a novel in situ chemical vapor deposition, activated N-doped hollow carbon-nanotube/carbon-nanofiber composites are prepared having a superhigh specific Brunauer–Emmett–Teller (BET) surface area of 1840 m(2) g(–1) and a total pore volume of 1.21 m(3) g(–1). As an anode, this material has a reversible capacity of ~1150 mAh g(–1) at 0.1 A g(–1) (0.27 C) after 70 cycles. At 8 A g(–1) (21.5 C), a capacity of ~320 mAh g(–1) fades less than 20% after 3500 cycles, which makes it a superior anode material for a Li-ion battery.