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Title: Lithium Insertion Chemistry of Some Iron Vanadates

Abstract

Lithium insertion into various iron vanadates has been investigated. Fe{sub 2}V{sub 4}O{sub 13} and Fe{sub 4}(V{sub 2}O{sub 7}){sub 3} {center_dot} 3H{sub 2}O have discharge capacities approaching 200 mAh/g above 2.0 V vs. Li{sup +}/Li. Although the potential profiles change significantly between the first and subsequent discharges, capacity retention is unexpectedly good. Other phases, structurally related to FeVO{sub 4}, containing copper and/or sodium ions were also studied. One of these, {beta}-Cu{sub 3}Fe{sub 4}(VO{sub 4}){sub 6}, reversibly consumes almost 10 moles of electrons per formula unit (ca. 240 mAh g{sup -1}) between 3.6 and 2.0 V vs. Li{sup +}/Li, in a non-classical insertion process. It is proposed that both copper and vanadium are electrochemically active, whereas iron(III) reacts to form LiFe{sup III}O{sub 2}. The capacity of the Cu{sub 3}Fe{sub 4}(VO{sub 4}){sub 6}/Li system is nearly independent of cycling rate, stabilizing after a few cycles at 120-140 mAh g{sup -1}. Iron vanadates exhibit better capacities than their phosphate analogues, whereas the latter display more constant discharge potentials.

Authors:
;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
928486
Report Number(s):
LBNL-61528
Journal ID: ISSN 1388-2481; R&D Project: 000000; BnR: VT0301030; TRN: US200815%%345
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Electrochemistry Communications; Journal Volume: 9; Journal Issue: 3; Related Information: Journal Publication Date: 03/2007
Country of Publication:
United States
Language:
English
Subject:
25; CAPACITY; CHEMISTRY; COPPER; ELECTRONS; IRON; LITHIUM; PHOSPHATES; RETENTION; SODIUM IONS; VANADATES; VANADIUM

Citation Formats

Patoux, Sebastien, and Richardson, Thomas J. Lithium Insertion Chemistry of Some Iron Vanadates. United States: N. p., 2007. Web. doi:10.1016/j.elecom.2006.10.006.
Patoux, Sebastien, & Richardson, Thomas J. Lithium Insertion Chemistry of Some Iron Vanadates. United States. doi:10.1016/j.elecom.2006.10.006.
Patoux, Sebastien, and Richardson, Thomas J. Fri . "Lithium Insertion Chemistry of Some Iron Vanadates". United States. doi:10.1016/j.elecom.2006.10.006. https://www.osti.gov/servlets/purl/928486.
@article{osti_928486,
title = {Lithium Insertion Chemistry of Some Iron Vanadates},
author = {Patoux, Sebastien and Richardson, Thomas J.},
abstractNote = {Lithium insertion into various iron vanadates has been investigated. Fe{sub 2}V{sub 4}O{sub 13} and Fe{sub 4}(V{sub 2}O{sub 7}){sub 3} {center_dot} 3H{sub 2}O have discharge capacities approaching 200 mAh/g above 2.0 V vs. Li{sup +}/Li. Although the potential profiles change significantly between the first and subsequent discharges, capacity retention is unexpectedly good. Other phases, structurally related to FeVO{sub 4}, containing copper and/or sodium ions were also studied. One of these, {beta}-Cu{sub 3}Fe{sub 4}(VO{sub 4}){sub 6}, reversibly consumes almost 10 moles of electrons per formula unit (ca. 240 mAh g{sup -1}) between 3.6 and 2.0 V vs. Li{sup +}/Li, in a non-classical insertion process. It is proposed that both copper and vanadium are electrochemically active, whereas iron(III) reacts to form LiFe{sup III}O{sub 2}. The capacity of the Cu{sub 3}Fe{sub 4}(VO{sub 4}){sub 6}/Li system is nearly independent of cycling rate, stabilizing after a few cycles at 120-140 mAh g{sup -1}. Iron vanadates exhibit better capacities than their phosphate analogues, whereas the latter display more constant discharge potentials.},
doi = {10.1016/j.elecom.2006.10.006},
journal = {Electrochemistry Communications},
number = 3,
volume = 9,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}