Electrochemical reduction of nano-SiO2 in hard carbon as anode material for lithium ion batteries

• DOI: 10.1016/j.elecom.2008.09.032
• Publication Date: 2008-10-01T09:46:12Z
• Authors: Bingkun Guo; Jie Shu; Zhaoxiang Wang; Hong Yang; Lihong Shi; Yinong Liu; Liquan Chen
• Keywords: Carbon fibers

A composite of silica (SiO2) and hard carbon was prepared by hydrothermal reaction. Special attention was paid to the characterization of the possible electrochemical reduction of nano-SiO2 in the composite. Evidence by solid-state nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) and high lithium storage capacity of the composite prove the electrochemical reduction of nano-SiO2 and the formation of Li4SiO4 and Li2O as well as Si in the first-discharge. The reversible lithium storage capacity of the nano-SiO2 is as high as 1675 mAh/g. (C) 2008 Elsevier B.V. All rights reserved.