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Report No.

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.



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