RESEARCH ARTICLE


Characterization and Electrochemical Behavior of Graphene-Based Anode for Li-Ion Batteries



Wei-Ren Liu*, 1, 2, Shin-Liang Kuo1, Chia-Yi Lin2, Yi-Chen Chiu1, Ching-Yi Su1, Hung-Chun Wu1, Chien-Te Hsieh3
1 Material and Chemical Research Laboratories, ITRI, Hsinchu 300, Taiwan, R.O. China
2 Department of Chemical Engineering, Chung Yuan Christian University, 200, Chung Pei Rd., Chung Li, 32023, Taiwan, R.O. China
3 Department of Chemical Engineering and Materials Science, Yuan Ze Fuel Cell Center, Yuan Ze University, Taoyuan 320, Taiwan, R.O. China


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© 2011 Liu et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to these authors at the Material and Chemical Research Laboratories, ITRI, Hsinchu 300, Taiwan, R.O. China; Fax: +886-3-5723764; E-mail: WRLiu@itri.org.tw and Department of Chemical Engineering and Materials Science, Yuan Ze Fuel Cell Center, Yuan Ze University, Taoyuan 320, Taiwan, R.O. China; E-mail: cthsieh@staurn.yzu.edu.tw


Abstract

In this study, we investigate the characteristics and electrochemical properties of graphene nanosheets derived from chemical-thermal exfoliation processes of SFG44 synthetic graphite (SFG44-GNS). The characterizations and electrochemical measurements were carried out by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, cyclic voltammetry, BET, Raman, rate capability as well as cycling tests and AC impedance. The as-synthesized SFG44-GNS with larger d-spacing of 0.3407 nm exhibits reversible capacity of 626 mAh/g and good rate capability of ~ 300 mAh/g at 2C rate, which are superior to those of graphite anode. The enhanced electrochemical performance of GNS anode was resulted from larger d-spacing, lower impedance in the interface and enhanced pore volume. The results indicate that graphene-based material is a good candidate for HEV/EV application.

Keywords: Graphene, Anode, Li-ion battery, Exfoliation.