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Title Study of Mn dissolution from LiMn{sub 2}O{sub 4} spinel electrodes using rotating ring-disk collection experiments
Creator/Author Wang, Li-Fang ; Ou, Chin-Ching ; Striebel, Kathryn A. ; Chen, Jenn-Shing
Publication Date2003 Jul 01
OSTI IdentifierOSTI ID: 840730
Report Number(s)LBNL--53533
DOE Contract NumberAC03-76SF00098
Other Number(s)R&D Project: 674501; TRN: US200512%%148
Resource TypeJournal Article
Specific TypePREPRINT
Resource RelationJournal: Journal of The Electrochemical Society; Journal Volume: 150; Journal Issue: 7; Other Information: Submitted to the Journal of The Electrochemical Society: Volume 150, No.7; Journal Publication Date: 7/2003; PBD: 1 Jul 2003
Research OrgErnest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring OrgUS Department of Energy (US)
Subject36 MATERIALS SCIENCE; MANGANESE; DISSOLUTION; ELECTRODES; MONITORING; SPINELS; LITHIUM OXIDES; MANGANESE OXIDES
Description/Abstract The goal of this research was to measure Mn dissolution from a thin porous spinel LiMn{sub 2}O{sub 4} electrode by rotating ring-disk collection experiments. The amount of Mn dissolution from the spinel LiMn{sub 2}O{sub 4} electrode under various conditions was detected by potential step chronoamperometry. The concentration of dissolved Mn was found to increase with increasing cycle numbers and elevated temperature. The dissolved Mn was not dependent on disk rotation speed, which indicated that the Mn dissolution from the disk was under reaction control. The in situ monitoring of Mn dissolution from the spinel was carried out under various conditions. The ring currents exhibited maxima corresponding to the end-of-charge (EOC) and end-of-discharge (EOD), with the largest peak at EOC. The results suggest that the dissolution of Mn from spinel LiMn{sub 2}O{sub 4} occurs during charge/discharge cycling, especially in a charged state (at >4.1 V) and in a discharged state (at <3.1 V). The largest peak at EOC demonstrated that Mn dissolution took place mainly at the top of charge. At elevated temperatures, the ring cathodic currents were larger due to the increase of Mn dissolution rate.
Country of PublicationUnited States
LanguageEnglish
FormatSize: 7 pages; Format: Adobe PDF Document with Extractable Text
AvailabilityOSTI as DE00840730
System Entry Date2005 Jul 03

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