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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 12
BKCSDE 31(12)
December 20, 2010 

In Situ X-ray Absorption Spectroscopic Study for α-MoO3 Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries
Joo Hee Kang, Seung Min Paek*, Jin Ho Choy*
X-ray absorption spectroscopy, Layered material, Lithium secondary battery
In-situ X-ray absorption spectroscopy (XAS) was used to elucidate the structural variation of α-MoO3 electrode upon discharge/charge reaction in a lithium ion battery. According to the XAS analysis, hexavalent Mo atoms in α-MoO3 framework are reduced as the amount of intercalated lithium ions increases. As lithium de-intercalation proceeds, most of pre-edge peaks are restored again. However, according to the Fourier transforms of the extended X-ray absorption fine structure (EXAFS) spectra, lithium de-intercalation reaction is partially irreversible upon the charge reaction, which is one of the main reasons why the capacity of α-MoO3 electrode decreases upon successive discharge/charge cycles.
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