Interfacial studies of a thin-film Li2Mn4O9 electrode

被引：27

作者：

Kostecki, R ^{[1
]}

Kong, FP ^{[1
]}

Matsuo, Y ^{[1
]}

McLarnon, F ^{[1
]}

机构：

[1] Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA

来源：

ELECTROCHIMICA ACTA | 1999年 / 45卷 / 1-2期

关键词：

interfacial films; manganese oxide electrode;

D O I：

10.1016/S0013-4686(99)00206-6

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

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. Published by Elsevier Science Ltd.

引用

页码：225 / 233

页数：9

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