Journal
ELECTROCHIMICA ACTA
Volume 187, Issue -, Pages 473-479Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.11.008
Keywords
SiO-C composite; Conversion behavior; Electrochemical performance; Anode material; Lithium-ion batteries
Categories
Funding
- Program of China [2011AA11A255]
- Natural Science Foundation of Tianjin, China [13JCZDJC32000]
- MOE Innovation Team [IRT13022]
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A SiO/graphite/amorphous carbon (SiO-C) hybrid anode with superior electrochemical performance is successfully realized by using a low-cost and simple method. Here, we apply a pretreatment of commercialized graphite by ball-milling to realize evenly dispersion of the components and good effect of carbon coating, thus resulting in excellent cycling stability. Specifically, the as-prepared sample shows a high reversible capacity of 850 mA h g(-1) after 100 cycles at 100 mA g(-1) and excellent rate capability of 730 mA h g(-1) even at 500 mA h g(-1). Additionally, a relatively high initial coulombic efficiency of 77% is delivered among SiO-based anode materials. High-resolution transmission electron microscope (HRTEM) technique is used to further visually verify the conversion behavior of SiO in the first cycle: scattered amorphous silicon particles with size about 5 nm and irreversible Li4SiO4 as the detected resultants. The result of electrochemical impedance spectroscopy (EIS) reveals that the polarization resistance (Rp) decreases with pre-treated graphite. This work presents a facile approach to prepare Si-based anode material for new generation lithium-ion batteries with high energy density and more insights into the conversion behavior of SiO. (C) 2015 Elsevier Ltd. All rights reserved.
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