Fast lithium ion conducting solid state thin-film electrolytes based on lithium thio-germanate materials

✍ Scribed by Inseok Seo; Steve W. Martin

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 467 KB
• Volume: 59
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2010.11.050

✦ Synopsis

In this study, lithium thio-germanate thin-film electrolytes for lithium rechargeable batteries have been successfully prepared by radiofrequency (RF) magnetron sputtering deposition in Ar gas atmospheres. The targets for RF sputtering were prepared by melting, milling and pressing the appropriate amounts of the starting materials in the nLi 2 S + GeS 2 , n = 1-4, binary system. 2 mm wide  18 mm long Au electrodes with a parallel configuration of 2 mm spacing were sputtered to $100 nm thick at a sputtering rate at $5 nm min À1 on Al 2 O 3 single crystal substrates. Thin-film electrolytes were grown on this electrode assembly at 50 W power and 25 mtorr in Ar gas pressure. The ionic conductivities of the thin-film electrolytes were measured from À25 °C to 100 °C with 25 °C increments over the frequency range 0.1 Hz-1 MHz. The d.c. ionic conductivities determined from complex plane plots of the impedance of the