Abstract
Abstract We studied the photoresponse of a membrane electrode of stoichiometric LiCoO 2 used in lithium ion batteries. The electrode LiCoO 2 in contact with dimethyl carbonate, propylene carbonate and LiClO 4 presents the behavior of a p-semiconductor/electrolyte junction. The deinsertion of lithium of the LiCoO 2 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 Li x CoO 2 electrode probed by the photoelectrochemical experiments during deinsertion are reversible until x =0.5. The direct band gap energy of the LiCoO 2 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.
Published Version
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