New thin film solid electrolytes with high ionic conductivity for lithium-ion microbatteries
Published : 22 November 2016
The aim of the work will be the development of new glassy inorganic electrolytes able to meet both conductivity and process requirements for the realization of microbatteries with enhanced performance. These sulfide or oxide type materials, based on network formers comprising a metal or semi-metal element, will be deposited as thin films by radio-frequency magnetron sputtering of home-made targets, using an equipment connected to a glovebox. Different strategies dealing with materials composition (type of network former, synergic effect of mixed formers) and/or structure (glass-ceramics) will be carried out to get optimal performance in terms of ionic and electronic transport, chemical and electrochemical stability. Numerous techniques will be used to determine the chemical composition of the thin films (ICP, Rutheford Back-scaterring Spectroscopy, Electron Probe Micro Analysis, Auger spectroscopy, …) and to characterize their structure (X-ray diffraction, Raman spectroscopy, XPS, TEM,…) and their morphology (MEB-FEG). Impedance spectroscopy measurements performed at different temperatures will allow determining conduction properties (ionic conductivity, activation energy). In the course of this study, the behavior of selected electrolytes will be assessed in real microbatteries. The work will be carried out in the CEA/CNRS team located at ICMCB (Bordeaux).