Development of Lithium Iron Oxide Cathode Materials for Lithium Secondary Batteries
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- LEE Yun-S.
- Faculty of Applied Chemical Engineering, Chonnam National University
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- CHO Sung-J.
- Faculty of Applied Chemical Engineering, Chonnam National University
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- SUN Yang-K.
- Department of Chemical Engineering, Hanyang University
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- KOBAYAKAWA Koichi
- Department of Applied Chemistry, Kanagawa University
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- SATO Yuichi
- Department of Applied Chemistry, Kanagawa University
Bibliographic Information
- Other Title
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- Headline: Development of Lithium Iron Oxide Cathode Materials for Lithium Secondary Batteries
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Abstract
<p>Two lithium iron oxides have been synthesized at low temperatures by the conventional solid-state method. Orthorhombic LiFeO2 has been synthesized using LiOH and γ-FeOOH at 150°C was composed of orthorhombic LiFeO2 and small amount of spinel LiFe5O8 phases. A Li/LiFeO2 cell showed not only a fairly high initial discharge capacity of over 150 mAh g−1 but also a good cycle retention rate at room temperature. It was found that the orthorhombic phase of the LiFeO2 underwent a structural change to the LiFe5O8 spinel phase in the first cycle. Especially, it showed a severe structural change during the first discharge process, which might be the main reason for the capacity loss of the Li/LiFeO2 system. An amorphous-like LixFeyOz has been synthesized using LiOH and α-FeOOH at 200°C consisted of three kinds of structures, LiFe5O8, Li5FeO4, and a trace of cubic α-LiFeO2 A Li/LixFeyOz cell showed a very high initial discharge capacity (215 mAh g−l) as well as an excellent cycle retention rate (95%) from the 11th to the 50th cycle. It was found that LixFeyOz material was transformed into the spinel LiFe5O8 and tetragonal β-LiFeO2 phases after long-term cycling.</p>
Journal
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- Electrochemistry
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Electrochemistry 73 (10), 874-882, 2005-10-05
The Electrochemical Society of Japan
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Details 詳細情報について
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- CRID
- 1390845713073829632
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- NII Article ID
- 10016126116
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- NII Book ID
- AN00151637
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- ISSN
- 21862451
- 13443542
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- NDL BIB ID
- 7688375
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Allowed