Effect of pH value on electrochemical property of tin compounds loaded graphite anodes for Li-ion battery applications

A chemical solution method was adopted to prepare Sn compounds loaded graphite anodes with various pH values. When the pH value was 6, multi-phase of Sn compounds were deposited on slices of graphite. The multi-phase compound which contained Sn 6O 4(OH) 4, SnO 2, Sn 3(PO 4) 2, and graphite were expe...

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Bibliographic Details
Published in:Journal of alloys and compounds 2010-02, Vol.490 (1), p.393-398
Main Authors: Lin, Yu-Sheng, Duh, Jenq-Gong, Shieh, Deng-Tswen, Yang, Mo-Hua
Format: Article
Language:English
Subjects:
Chemistry
Electrochemical reactions
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
General and physical chemistry
Graphite
Multi-phase
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Summary:A chemical solution method was adopted to prepare Sn compounds loaded graphite anodes with various pH values. When the pH value was 6, multi-phase of Sn compounds were deposited on slices of graphite. The multi-phase compound which contained Sn 6O 4(OH) 4, SnO 2, Sn 3(PO 4) 2, and graphite were expected to provide a higher ratio of spectator/Sn for improved cyclability. These phases could be reduced to metallic Sn generating buffer matrix during 1st cycle. The sample pH 6 exhibited the best electrochemical property among all. During cycling between 0.001 and 1.5 V, the 1st charge capacity was around 758 mAh g −1. Even after 50 cycles, the capacity remained higher than 460 mAh g −1. It was demonstrated that multi-phase of Sn compounds loaded graphite anode of sample pH 6 exhibited a better cycling performance than the commercial graphite.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2009.10.016