Journal
APPLIED SURFACE SCIENCE
Volume 416, Issue -, Pages 527-535Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.04.199
Keywords
Carbon coating; Pyrolysis; Silicon dioxide; Silicon suboxide; Lithium ion battery
Categories
Funding
- National Research Foundation of Korea (NRF) Grant - Korean Government [20090093814, 2015R1A5A7037615, 2016R1C1B1014015]
- National Research Foundation of Korea [2016R1C1B1014015] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
Carbon-coated Si-SiOx-Al2O3 composite materials were prepared via a two-step process involving a high-energy mechanical milling and a pyrolysis reaction, and their electrochemical properties were subsequently examined for use as anode materials for Li-ion batteries. To synthesize the nanocrystalline Si embedded SiOx composite, amorphous SiO2 and metallic Al were chosen as the best pair of starting materials. First, a simple high-energy mechanical milling process was performed to partially reduce amorphous SiO2 using Al metal. Al was spontaneously oxidized to Al2O3; this resulted in a nanocrystalline Si dispersed amorphous SiOx-Al2O3 phase. Second, the composite was heat-treated in the presence of naphthalene as a carbon source. Through the pyrolysis reaction of naphthalene, an amorphous carbon coating layer was obtained; this layer stabilized the crystal structure of SiOx-Al2O3. The materials properties of the composites were investigated using various analytical tools. Electrochemical tests showed that the carbon-coated composite electrode exhibited good cycling stability up to 300 cycles. This performance can be attributed to the effect of the carbon coating, which both facilitated fast electronic and Li+ ionic transport and played a buffering role in the large volume change of the Si-based anode materials. (C) 2017 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available