Interfacial analysis of surface-coated LiMn $_{2}$ O $_{4}$ epitaxial thin film electrode for lithium batteries

Suzuki, Kota*; Hirayama, Masaaki*; Kim, K.-S.*; Taminato, So*; Tamura, Kazuhisa ; Son, J.-Y.*; Mizuki, Junichiro; Kanno, Ryoji*

The effects of surface coatings on LiMn $_{2}$ O $_{4}$ were investigated using LiMn $_{2}$ O $_{4}$ epitaxial thin films with a thickness of 30 nm. Bare and surface-coated LiMn $_{2}$ O $_{4}$ epitaxial thin films were synthesized on SrTiO $_{3}$ (111) substrates using a pulsed laser deposition method. The surface coating, which was formed using the solid electrolyte Li $_{3}$ PO $_{4}$ and had a thickness of 3 nm, improved the reversibility of the electrochemical reactions undergone by the LiMn $_{2}$ O $_{4}$ epitaxial thin films. The changes induced in the surface structure were maintained during battery operation; in contrast, the bare LiMn $_{2}$ O $_{4}$ thin film exhibited structural degradation and Mn dissolution. The structural changes induced in the coated electrode and the increase in its surface stability were intrinsic effects of the Li $_{3}$ PO $_{4}$ coating and improved the electrochemical performance of the LiMn $_{2}$ O $_{4}$ thin-film electrode.

Language	:	English
Journal	:	Journal of the Electrochemical Society
Volume	:	162
Number	:	13
Pages	:	p.A7083 - A7090
Publication Year/Month	:	2015/08
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Paper URL	:	https://doi.org/10.1149/2.0111513jes
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : AA20160362
JAEA Abstracts No. : 46000351
Paper Submission No. : 19947

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Interfacial analysis of surface-coated LiMnO epitaxial thin film electrode for lithium batteries

Interfacial analysis of surface-coated LiMn $_{2}$ O $_{4}$ epitaxial thin film electrode for lithium batteries