2015年5月
Crystal Structural Changes and Charge Compensation Mechanism during Two Lithium Extraction/Insertion between Li2FeSiO4 and FeSiO4
JOURNAL OF PHYSICAL CHEMISTRY C
- 巻
- 119
- 号
- 19
- 開始ページ
- 10206
- 終了ページ
- 10211
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.jpcc.5b00362
- 出版者・発行元
- AMER CHEMICAL SOC
Li2FeSiO4 is a promising cathode material for lithium ion batteries because of its theoretically high capacity if two lithium ions can be extracted/inserted per formula unit; however, the extraction/insertion of two lithium ions from Li2FeSiO4 remains a challenge. Herein, we successfully synthesized carbon-coated Li2FeSiO4 nanoparticles which exhibit a capacity commensurate to a reversible two-lithium extraction/insertion at elevated temperature. This study investigates the mechanism underlying a two lithium ion extraction/insertion in Li2FeSiO4 using synchrotron X-ray absorption spectroscopy and X-ray diffraction. Our results reveal that the contribution of the Fe-3d band is dominant for the first lithium extraction process from Li2FeSiO4 to LiFeSiO4. During the second lithium extraction process from LiFeSiO4 to FeSiO4, however, ligand holes are formed in the O-2p band rather than further oxidation of Fe3+. Structural analyses further reveal a phase transformation between Li2FeSiO4 and LiFeSiO4, while a single-phase behavior is observed for Li2-xFeSiO4 (1.0 <= x <= 2.0). Together with a tentatively refined crystal structure of the FeSiO4 phase (x = 2.0), we discuss the charge compensation mechanism during two lithium extraction/insertion in Li2FeSiO4.
- リンク情報
-
- DOI
- https://doi.org/10.1021/acs.jpcc.5b00362
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201502232959488123
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000354912200005&DestApp=WOS_CPL
- URL
- http://www.scopus.com/inward/record.url?eid=2-s2.0-84929377611&partnerID=MN8TOARS
- URL
- http://orcid.org/0000-0002-1491-2647
- ID情報
-
- DOI : 10.1021/acs.jpcc.5b00362
- ISSN : 1932-7447
- J-Global ID : 201502232959488123
- ORCIDのPut Code : 42857404
- SCOPUS ID : 84929377611
- Web of Science ID : WOS:000354912200005