Document Detail


Synthesis of tetrahedral LiFeO2 and its behavior as a cathode in rechargeable lithium batteries.
MedLine Citation:
PMID:  18284239     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Synthesis and structural characterization of the first LiFeO2 compound with tetrahedrally coordinated Fe3+ is reported. When used as a positive intercalation electrode in a lithium cell, it can store charge of up to 120 mAhg(-1) at a rate of 100 mAg(-1). However, it converts to the defect spinel LiFe5O8 on cycling. By combining results from powder X-ray diffraction, differential electrochemical mass spectrometry, electrochemical cycling, and TG-MS, it is shown that such conversion, which involved oxygen loss, is not associated with direct O2 gas evolution but instead reaction with the electrolyte. We suggest that intercalation/deintercalation is accompanied by the exchange of Li+ by H+ in the material and subsequent loss of H2O, thus converting LiFeO2 to the defect spinel LiFe5O8 on cycling.
Authors:
A Robert Armstrong; Daniel W Tee; Fabio La Mantia; Petr Novák; Peter G Bruce
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Publication Detail:
Type:  Journal Article     Date:  2008-02-20
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  130     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-03-12     Completed Date:  2008-04-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3554-9     Citation Subset:  -    
Affiliation:
EaStCHEM, School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST, UK.
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