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1266-CC05-07

LaF3-BaF2-KF derived electrolyte in solid state fluoride-ion battery Dechao Wang1,2, M. Anji Reddy1, H. Hahn1,2, M. Fichtner1 1 Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany 2 Technical University of Darmstadt, Joint Research Laboratory Nanomaterials, Petersenstr. 23, 64287 Darmstadt, Germany ABSTRACT Solid-state based battery technology offers, in principle, the largest temperature range (from room temperature to 500 ºC) of any battery technology. In fluoride based batteries, the chemical reaction used to create electrical energy is a solid-state reaction of a metal with fluoride anion [1]. Among the various types of solid preparation techniques, the mechanochemical synthesis has been recognized as a powerful route to novel, high-performance, and low-cost materials [2]. Thus, a mixed and highly disordered fluoride phase with retained cubic symmetry can be obtained with a very high F¯ diffusivity [3]. In our group, a series of new electrolytes was developed, namely LaF3-BaF2-KF solid solutions, using mechanosynthesis method. The cubic structure of the product was confirmed by XRD. The nanoscale nature and morphology of the samples were characterized by SEM and TEM. First Solid-state electrochemical cells were built with LiF based composite cathode, LaF3BaF2-KF derived electrolyte and Fe based composite anode. INTRODUCTION Recently, lithium-ion-batteries have been applied for energy storage, for instance in electrical vehicles, power backups, and other stationary devices. The performance of lithium batteries depends primarily on their ability to provide the required key features: high energy density, high power density, rate capability, safety, and extended cyclic stability [4-6], flammable electrolytes utilized so far in lithium-ion-battery system have caused safety problems. To overcome this problem, solid state battery may be a good choice to maintain high energy density, power density, and in addition, it may offer low risk of explosion, wide temperature operation range and easy fabrication process. Solid-state galvanic primary cells with a metal anode, a fluoride ion conducting electrolyte, and a metal fluoride as cathode have already been described [7-12]. Fluorides of copper, silver [7,8], nickel, cadmium, lead [9], and bismuth [10-12] have been utilized as cathode, aniondeficient solid solutions based on calcium fluoride, and lead fluoride [8-10], or anion-excess solid solutions based on lead fluoride [11], and alkaline earth fluorides [12] have been employed as solid electrolyte, while lead [7-10,12], magnesium, zinc [9], and calcium [12] have been applied as anode. Carbon fluorides and complex fluorides such as K2PbF6, K2NiF6 and K2MnF6 form suitable cathodes in connection with the anion-deficient solid electrolytes Pb1-xKxF2-x (x