Structural study of epitaxial LiCoO2 films grown by pulsed laser deposition on single crystal SrTiO3 substrates

THIN SOLID FILMS

卷:612

Article

Li, Z.¹  Yasui, S.³  Takeuchi, S.¹  Creuziger, A.¹  Maruyama, S.⁴  Herzing, A. A.¹  Takeuchi, I.²  Bendersky, L. A.¹ 

[1] NIST, Mat Measurement Lab, 100 Bur Dr, Gaithersburg, MD 20899 USA

[2] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[3] Tokyo Inst Technol, Mat & Struct Lab, Tokyo, Japan

[4] Tohoku Univ, Dept Appl Chem, Sendai, Miyagi 9808579, Japan

关键词: Lithium cobalt oxide;    Thin films;    Epitaxy;    Lithium-ion battery;    Li-ion battery;    Pulsed laser deposition;    Transmission electron microscopy;   

DOI  :  10.1016/j.tsf.2016.05.017

来源: Elsevier

【 摘 要 】

Epitaxial LiCoO2 (LCO) thin films of different orientations were fabricated by pulsed laser deposition (PLD) in order to model single-crystal behavior of intercalation cathodes during electrochemical reactions. This paper demonstrates that (1) epitaxial growth of LCO on a single crystal Nb-doped SrTiO3 (Nb:STO) of different orientations occurs with a single orientation relationship; (2) surface morphology of the LCO films is established by the morphology of coalescing grains during island growth mode, whereas morphology of the grains can be visualized as different cuts from a cube with low-energy {104}(R-LCO) surfaces; (3) the films consist of predominately trigonal R-LiCoO2 phase, with a small fraction of the occasionally present cubic c-LixCoO2 phase; (4) cyclic voltammetry measurements have determined rectification at interface between LCO and Nb:STO causing bias on the oxidation part of cycling, thus preventing full cycling. Published by Elsevier B.V.

【 授权许可】

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