Effects of crystallinity and impurities on the electrical conductivity of Li-La-Zr-O thin films

THIN SOLID FILMS

卷:576

Article

Park, Joong Sun^1,2  Cheng, Lei^1,3  Zorba, Vassilia¹  Mehta, Apurva⁴  Cabana, Jordi^1,5  Chen, Guoying¹  Doeff, Marca M.¹  Richardson, Thomas J.¹  Son, Ji-Won^6,7  Hong, Wan-Shick⁶ 

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

[2] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA

[3] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[4] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA

[5] Univ Illinois, Dept Chem, Chicago, IL 60607 USA

[6] Univ Seoul, Dept Nanosci & Technol, Seoul, South Korea

[7] Korea Inst Sci & Technol, High Temp Energy Mat Res Ctr, Seoul 136791, South Korea

关键词: Lithium;    Solid electrolyte;    Garnet;    Lithium lanthanate zirconate;    Pulsed laser deposition;   

DOI  :  10.1016/j.tsf.2014.11.019

来源: Elsevier

【 摘 要 】

We present a study of the fabrication of thin films from a Li7La3Zr2O12 ( LLZO) target using pulsed laser deposition. The effects of substrate temperatures and impurities on electrochemical properties of the films were investigated. The thin films of Li-La-Zr-O were deposited at room temperature and higher temperatures on a variety of substrates. Deposition above 600 degrees C resulted in a mixture of cubic and tetragonal phases of LLZO, as well as a La2Zr2O7 impurity, and resulted in aluminum enrichment at the surface when Al-containing substrates were used. Films deposited at 600 degrees C exhibited the highest room temperature conductivity, 1.61 x 10-6 S/cm. The chemical stability toward metallic lithium was also studied using X-ray photoelectron spectroscopy, which showed that the oxidation state of zirconium remained at +4 following physical contact with heated lithium metal. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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