Electrochemical performance of polygonized carbon nanofibers as anode materials for lithium-ion batteries--颗粒学报PARTICUOLOGY

Jiang, J., Tang, X., Wu, R., Lin, H., & Qu, M. (2013). Electrochemical performance of polygonized carbon nanofibers as anode materials for lithium-ion batteries. Particuology, 11(4), 401–408. https://doi.org/10.1016/j.partic.2012.07.011

Electrochemical performance of polygonized carbon nanofibers as anode materials for lithium-ion batteries

Jinjin Jiang ^{a b}, Xiaolin Tang ^{a b}, Rui Wu ^a, Haoqiang Lin ^a, Meizhen Qu ^a *

a Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
b Graduate University of Chinese Academy of Sciences, Beijing 100039, China

10.1016/j.partic.2012.07.011

Volume 11, Issue 4, August 2013, Pages 401-408

Received 30 April 2012, Revised 26 June 2012, Accepted 13 July 2012, Available online 26 March 2013.

E-mail: mzhqu@cioc.ac.cn; carbon1113@163.com

Highlights

• CCVD produced P-CNFs were demonstrated as a high-rate Li storage material for LIBs.

• Reversible capacities of P-CNFs were 198.4 and 158.2 mAh/g at current density of 3.7 and 7.4 A/g.

• Carbon-coated P-CNFs were prepared by thermal vapor deposition of benzene.

• Carbon-coated P-CNFs exhibit an increased coulombic efficiency and improved cycling stability.

Abstract

Carbon nanofibers with a polygonal cross section (P-CNFs) synthesized using a catalytic chemical vapor deposition (CCVD) technology have been investigated for potential applications in lithium batteries as anode materials. P-CNFs exhibit excellent high-rate capabilities. At a current density as high as 3.7 and 7.4 A/g, P-CNFs can still deliver a reversible capacity of 198.4 and 158.2 mAh/g, respectively. To improve their first coulombic efficiency, carbon-coated P-CNFs were prepared through thermal vapor deposition (TVD) of benzene at 900 °C. The electrochemical results demonstrate that appropriate amount of carbon coating can improve the first coulombic efficiency, the cycling stability and the rate performance of P-CNFs. After carbon coating, P-CNFs gain a weight increase approximately by 103 wt%, with its first coulombic efficiency increasing from 63.1 to 78.4%, and deliver a reversible capacity of 197.4 mAh/g at a current density of 3.7 A/g. After dozens of cycles, there is no significant capacity degradation at both low and high current densities.

Graphical abstract

Keywords

P-CNFs; Anode; Rate capability; TVD; First coulombic efficiency

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