%0 Nanopartikel unedler Metalle (Mg0, Al0, Gd0, Sm0) %A Bitzer, Martin %E Van Gestel, Tim %E Uhlenbruck, Sven %E Buchkremer, Hans Peter %I Elsevier %D 2016 %C Amsterdam u.a. %T Sol-gel synthesis of thin solid Li$_{7}$La$_{3}$Zr$_{2}$O$_{12}$ electrolyte films for Li-ion batteries %U http://juser.fz-juelich.de/record/812031/files/1-s2.0-S0040609016303157-main.pdf %U http://juser.fz-juelich.de/record/812031/files/1-s2.0-S0040609016303157-main.gif?subformat=icon %U http://juser.fz-juelich.de/record/812031/files/1-s2.0-S0040609016303157-main.jpg?subformat=icon-1440 %U http://juser.fz-juelich.de/record/812031/files/1-s2.0-S0040609016303157-main.jpg?subformat=icon-180 %U http://juser.fz-juelich.de/record/812031/files/1-s2.0-S0040609016303157-main.jpg?subformat=icon-640 %U http://juser.fz-juelich.de/record/812031/files/1-s2.0-S0040609016303157-main.pdf?subformat=pdfa %X The application of a solid state electrolyte layer could greatly improve current Li-ion batteries in terms of safety and reliability. Garnet-type Li7La3Zr2O12 (LLZ) appears as a candidate material, since it shows the highest reported Li-ion conductivity of all oxide ceramics at room temperature (σ > 10− 4 S cm− 1) and at the same time chemical stability against lithium. In this paper, a sol-gel process is presented for fabricating homogeneous thin film LLZ layers. These layers were deposited using dip-coating and spin-coating methods. A stable Yttrium-doped Li-La-Zr-based sol with a particle size of d50 = 10 nm was used as coating liquid. Successful deposition of such layers was accomplished using a sol concentration of 0.04 mol/l, which yielded for each coating step a layer thickness of ~ 50 nm. The desired single phase LLZ material could be obtained after thermal treatment at 800 °C for 10 min in Argon. Ionic conductivity of the layers was demonstrated with impedance spectroscopy. Continuing work on the development of half-cells is also presented. Half-cells which contain the novel LLZ electrolyte layer, a LiCoO2 cathode and a steel support were synthesized and investigated. Of considerable importance was the prevention of Lanthanum diffusion and the formation of non-conductive phases (e.g. La2Li0.5Co0.5O4) at the required heating temperature of 800 °C. It is shown that these unwanted processes can be prevented and that a structure with a single phase LLZ and LiCoO2 layer can be obtained by modifying the heating program to a rapid thermal treatment (10 K/s, 800 °C, no holding time).