|Title||Interfacial studies of a thin-film Li2Mn4O9 electrode|
|Publication Type||Journal Article|
|Year of Publication||1999|
|Authors||Kostecki, Robert, Fanping Kong, Yoshiaki Matsuo, and Frank R. McLarnon|
|Secondary Title||Electrochimica Acta|
|Keywords||interfacial films, manganese oxide electrode|
A thin-film spinel Li2Mn4O9 electrode was prepared by spin coating onto a Pt substrate. Spectroscopic ellipsometry, X-ray diffraction and current-sensing atomic force microscopy (CSAFM) were used to characterize interfacial processes and film formation at this electrode in the presence of 1.0 M LiPF6, EC:DMC (1:1 by volume) electrolyte. Prolonged exposure of the film to the electrolyte at ambient temperature resulted in spontaneous decomposition of the spinel to [lambda]-MnO2 without disruption of the original structure. The surface of the resulting [lambda]-MnO2 film exhibited no significant change in morphology, however a thin passive electrode surface layer was detected by the CSAFM probe. This electrode surface layer exhibited insulating properties and most likely contained Li2O, a by-product of Li2Mn4O9 decomposition.
0013-4686doi: DOI: 10.1016/S0013-4686(99)00206-6