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Microstructure and electrochemical performance of Si–SiO2–C composites as the negative material for Li-ion batteries

✍ Scribed by Zhiwei Lu; Lianqi Zhang; Xingjiang Liu

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
889 KB
Volume
195
Category
Article
ISSN
0378-7753

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✦ Synopsis

Si-SiO 2 -C composites are synthesized by ball milling the mixture of SiO, graphite and coal pitch, and subsequent heat treatment at 900 • C in inert atmosphere. The electrochemical performance and microstructure of the composites are investigated. XRD and TEM tests indicate that the carbon-coating structure of Si-SiO 2 -C composites form in pyrolysis process, which can remarkably improve the electrochemical cycling performance. The coal pitch as carbon precursor and graphite demonstrate the same important effect on the Li-alloying/de-alloying property of the Si-SiO 2 -C composites. The Si-SiO 2 -C composites exhibit the electrochemical reversible Li-alloying/de-alloying capacity of 700 mAh g -1 and excellent cyclic stability even at about the 90th cycle.

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