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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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In situ X-ray absorption spectroscopic study for the electrochemical delithiation of a cathode LiFe0 4Mn0 6PO4 material

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Title
In situ X-ray absorption spectroscopic study for the electrochemical delithiation of a cathode LiFe0 4Mn0 6PO4 material
Author
Nedoseykina, TatianaKim, Min GyuPark, Seul-AKim, Hyun-SooKim, Seong-BaeCho, JaephilLee, Youngil
Keywords
Cathode life; Cathode materials; De-lithiation; Electrochemical reactions; EXAFS; Extended x-ray absorption fine structure spectrum; In situ electrochemistry; In-situ; Li-ion batteries; LiFe0.4Mn0.6PO4 cathode; LiFePO; Lithium rechargeable batteries; Local atomic structures; Local structure; Reference material; Second plateau; Spectra analysis; Spectral behaviors; Spectroscopic studies; Structural change; Structural characterization; X ray absorption fine structures; X-ray absorption near-edge structure; XAFS
Issue Date
201012
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.55, no.28, pp.8876 - 8882
Abstract
The electronic and local atomic structural characterization of a promising cathode material LiFe0 4Mn0 6PO4 for a lithium rechargeable battery was performed by in situ X-ray absorption fine structure (XAFS) on both Mn and Fe K-edges Upon delithiation the X-ray absorption near edge structure (XANES) spectra analysis showed that the Fe2+/Fe3+ electrochemical reaction was two times faster than that of Mn2+/Mn3+ The Fe and Mn K-edge extended X-ray absorption fine structure (EXAFS) spectra were effectively altered with different spectral behaviors for the local atomic structure near Fe and Mn during delithiation Alternatively the EXAFS spectra of LiFePO4 changed significantly and those of LiMnPO4 were constant through all delithiations for the corresponding reference materials of LiFePO4 and LiMnPO4 The present study with XAFS characterization demonstrates that initially delithiated Fe-rich domains at 3 5 V can promote more effective local structural change of the neighboring Mn-rich domains during the next second plateau at 4 1 V which can ease delithiation in the Mn-rich domains through more flexible reaction of the local structure in the Mn octahedra Crown Copyright.
URI
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DOI
http://dx.doi.org/10.1016/j.electacta.2010.08.037
ISSN
0013-4686
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