Re-Deposition of Manganese Species on Spinel LiMn2O4 Electrode after Mn Dissolution
- Authors
- Kim, Daesoo; Park, Sangjin; Chae, Oh B.; Ryu, Ji Heon; Kim, Young-Ugk; Yin, Ri-Zhu; Oh, Seung M.
- Issue Date
- Jan-2012
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.159, no.3, pp.A193 - A197
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 159
- Number
- 3
- Start Page
- A193
- End Page
- A197
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/87359
- DOI
- 10.1149/2.003203jes
- ISSN
- 0013-4651
- Abstract
- Re-deposition of manganese compounds on LiMn2O4 electrode after Mn dissolution and its impact on the positive electrode performances are studied by a control experiment, in which the spinel electrode is stored in its charged state at elevated temperature (60 degrees C) to accelerate Mn dissolution. Upon storage with Li foil, the re-deposition of manganese species is marginal since the dissolved Mn2+ ions move to the Li foil to be deposited. When stored without Li foil, however, under which the chance for re-deposition of Mn species on the spinel electrode is rather high, the dissolved Mn2+ ions are deposited as oxide and fluoride. The depth-profiling X-ray photoelectron spectroscopy and transmission electron microscope studies illustrate that Mn-O species are deposited in the earlier period of storage, whereas the Mn-F compounds (MnF2) in the later stage. Due to the deposition of highly resistive MnF2 phase, the electrode stored for a longer period of time shows a severe cell polarization and capacity loss. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.003203jes] All rights reserved.
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