Chemical State of Iron of LiFePO<SUB>4</SUB> during Charge-Discharge Cycles Studied by <I>In-Situ</I> X-ray Absorption Spectroscopy
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- Inoue Katsuya
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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- Fujieda Shun
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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- Shinoda Kozo
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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- Suzuki Shigeru
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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- Waseda Yoshio
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
Bibliographic Information
- Other Title
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- Chemical state of iron of LiFePO4 during charge-discharge cycles studied by in-situ X-ray absorption spectroscopy
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Abstract
In-situ X-ray absorption spectroscopy (XAS) at the Fe K-edge X-ray absorption near edge was used to investigate the chemical change of LiFePO4, which is a candidate cathode material for lithium ion batteries, during charge-discharge cycles. The relative amount of FePO4 formed in the LiFePO4 by the charge-discharge cycles was estimated from the XAS spectra. The results show that the amount of FePO4 in the LiFePO4 increased with charging and decreased with discharging. While a linear relationship between the relative amount of FePO4 and electrical capacity was observed during the initial charging, it deviated from linearity during the charge-discharge cycles. This may be attributed to the irreversible diffusion paths of lithium ions and/or the partial formation of inactive FePO4 in the LiFePO4 during the charge-discharge cycles. It is shown that in-situ XAS has sufficient potential to nondestructively characterize heterogeneous electrochemical reactions in electrode materials during charge-discharge cycles.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 51 (12), 2220-2224, 2010
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390001204251040128
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- NII Article ID
- 10027471600
- 130004454371
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 10899764
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed