Carbon Coated Helical Carbon Nanotubes used as Anode Materials of Li-ion Battery

doi:10.3724/SP.J.1077.2011.00631

Abstract

Abstract: The helical carbon nanotubes (HCNTs) was modified with carbon through thermal vapor deposition (TVD) of benzene at 900 ℃, and characterized by X-ray powder diffraction, transmission electronic microscope, scanning electronic microscope and Brunau-Emmertt-Teller method. The specific surface area of the HCNTs decreased after carbon coating. The obtained carbon coated HCNTs used as anode materials of Li-ion battery were studied. The results revealed that appropriate amount of carbon coating could improve the first columbic efficiency, the cycling stability and rate charge/discharge performance of the HCNTs. After 45 min carbon coating, HCNTs gained a weight increase approximately 220wt%, with its first columbic efficiency increasing from 59.2% to 77.8%, and delivered a discharge capacity of 265.6, 245.7, 196.0, 163.2 mAh/g at the rates of 1.0C, 2.0C, 5.0C and 10.0C, respectively. After 95 cycles at 10.0C, its discharge capacity retention was 93.3%. Although excessive carbon coating could further improve the first coulumbic efficiency and cycling stability of HCNTs, it also degraded the rate capability.

Key words: helical carbon nanotubes, first columbic efficiency, TVD, Li-ion battery

CLC Number:

O646
TB383

SHAO Jin, REN Yu-Rong, LI Guo-Qiang, HUANG Xiao-Bing, ZHOU Gu-Min, QU Mei-zhen. Carbon Coated Helical Carbon Nanotubes used as Anode Materials of Li-ion Battery[J]. Journal of Inorganic Materials, 2011, 26(6): 631-637.

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