Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 501, Issue 1-2, Pages 253-259Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-0728(00)00536-2
Keywords
lithium ion batteries; lithium cobalt oxide; photoelectrochemistry; intercalation; cathodes
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We studied the photoresponse of a membrane electrode of stoichiometric LiCoO2 used in lithium ion batteries. The electrode LiCoO2 in contact with dimethyl carbonate, propylene carbonate and LiClO4 presents the behavior of a p-semiconductor /electrolyte junction. The deinsertion of lithium of the LiCoO2 suppresses the photoresponse at 3.9 V versus the lithium potential. The reappearance of the photoresponse after re-intercalation suggests that the alterations in the electronic structure of the LixCoO2 electrode probed by the photoelectrochemical experiments during deinsertion are reversible until x = 0.5. The direct band gap energy of the LiCoO2 stoichiometry is 2.5 eV before and after lithium reinsertion. The experiments showed also that a small photo-intercalation current is observed in this cathodic material. (C) 2001 Elsevier Science B.V. All rights reserved.
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