Document Detail

Better cycling performances of bulk Sb in Na-ion batteries compared to Li-ion systems: an unexpected electrochemical mechanism.
MedLine Citation:
PMID:  23194439     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Pure micrometric antimony can be successfully used as negative electrode material in Na-ion batteries, sustaining a capacity close to 600 mAh g(-1) at a high rate with a Coulombic efficiency of 99 over 160 cycles, an extremely high capacity compared to any other compound tested against both Li and Na. The reaction mechanism with Na does not simply go through the alloying mechanism observed for Li where the intermediate species are those expected from the phase diagram. In the case of Na, the intermediate phases are mostly amorphous and could not be precisely identified. Surprisingly, we evidenced that a competition takes place at the end of the discharge of the Sb/Na cell between the formation of the hexagonal and the cubic polymorphs of Na(3)Sb, the last being described in the literature as unstable at atmospheric pressure and only synthesized under high pressure (1-9 GPa). In addition, fluoroethylene carbonate added to the electrolyte combined with an appropriate electrode formulation based on carboxymethyl cellulose, carbon black, and vapor ground carbon fibers seems to be determinant in the excellent performances of this material.
Ali Darwiche; Cyril Marino; Moulay T Sougrati; Bernard Fraisse; Lorenzo Stievano; Laure Monconduit
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Publication Detail:
Type:  Journal Article     Date:  2012-12-11
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  134     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-26     Completed Date:  2013-05-30     Revised Date:  2013-09-13    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  20805-11     Citation Subset:  -    
Institut Charles Gerhardt UMR CNRS 5253, ALISTORE European Research Institute (3104 CNRS)-AIME, Université Montpellier 2, CC1502, place E. Bataillon, 34095 Montpellier cedex 5, France.
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Erratum In:
J Am Chem Soc. 2013 Jul 10;135(27):10179

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