Evaluation and performance improvement of Si/SiO sub(x)/C based composite as anode material for lithium ion batteries

The structure and electrochemical performances of Si/SiO sub(x)/C (SSC) and graphite-SSC composite (G-SSC) are evaluated in half cells and full cells as anode materials for lithium ion batteries. It is found that the SSC material shows a lithium storage capacity of 3 to 5 times higher than that of p...

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Bibliographic Details
Published in:Electrochimica acta 2014-01, Vol.115, p.16-21
Main Authors: Yuan, Qingfeng, Zhao, Fenggang, Zhao, Yanming, Liang, Zhiyong, Yan, Danlin
Format: Article
Language:English
Subjects:
Anodes
Composite materials
Electrolytes
Electrolytic cells
Lithium
Lithium batteries
Lithium-ion batteries
Particulate composites
Silicon
Silicon dioxide
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Summary:The structure and electrochemical performances of Si/SiO sub(x)/C (SSC) and graphite-SSC composite (G-SSC) are evaluated in half cells and full cells as anode materials for lithium ion batteries. It is found that the SSC material shows a lithium storage capacity of 3 to 5 times higher than that of pure graphite while the G-SSC composite exhibits a desirable cycling stability (+80%00cycles). Structural characterization reveals no particle cracks in the G-SSC composite. The Si particle is surrounded with lithium silicates, which provide protection against the electrolyte invasion and electrolyte decomposition but permits the Li+ ions to pass through. The graphite coating layer, on the other hand, acts as an electric conductive connector and volume buffer. These structural features make the SSC and G-SSC attractive as anode materials for high-performance commercial lithium ion batteries.
ISSN:0013-4686
DOI:10.1016/j.electacta.2013.10.106