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  Sci. Lett. J. 2015, 4: 174  
  Research Article
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An air-stable sandwiched Li3PO4/Ge solid electrolyte for thin film lithium ion batteries  
  Shibo Suna, Chuang Yuea,c, Jun Yina, Binbin Chenb, Mingsen Zhengb, Suntao Wua, Jing Lia,c, Junyong Kanga, Liwei Linc  
a Department of Physics / Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, Fujian, 361005, China
b State Key Lab of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, China
c Department of Mechanical Engineering, University of California, Berkeley, CA 94720, U.S.A

  A sandwiched thin film solid electrolyte with three layers of Li3PO4 and two layers of Ge, so called Li3PO4/Ge, has been produced by radio-frequency (RF) magnetron sputtering. With the optimization of those layers’ thickness, the maximum ionic conductivity of 1.5×10-6 S/cm accompanied with the ion transport number of 99.97% and the stable voltage window up to 5 V was accomplished in this sandwiched Li3PO4/Ge thin film solid electrolyte. The ionic conductivity can be well maintained at its original level even after two months in the air. Further detailed composition information in this Ge-layer composited thin film electrolyte was revealed by the X-ray photoelectron spectra (XPS) investigation, which evidences the interaction of Ge atoms with Li and P resulting in the increase of the ionic conductivity by three orders of magnitude with comparison to that of the sample without Ge composition.  
  Solid electrolyte; Sandwiched configuration; Thin film; Magnetron sputtering  
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