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001043158 005__ 20250624082526.0
001043158 0247_ $$2datacite_doi$$a10.34734/FZJ-2025-02774
001043158 0247_ $$2URN$$aurn:nbn:de:0001-2506230903296.203072864795
001043158 020__ $$a978-3-95806-824-7
001043158 037__ $$aFZJ-2025-02774
001043158 1001_ $$0P:(DE-Juel1)165315$$aLoutati, Asmaa$$b0$$eCorresponding author
001043158 245__ $$aOptimization of NaSICON-type lithium- ion conductors for solid-state batteries$$f- 2090-12-31
001043158 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2025
001043158 300__ $$aviii, 104
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001043158 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v664
001043158 502__ $$aDissertation, Duisburg-Essen, 2024$$bDissertation$$cDuisburg-Essen$$d2024
001043158 520__ $$aThe continuing depletion of fossil fuels, rising oil prices and the need to reduce CO2 emissions have stimulated intensive research into alternative energy technologies based on renewable and clean sources. Among the various technologies, electrochemical energy storage in rechargeable lithium-ion batteries (LIBs) plays an important role, both for powering a wide range of electronic devices and electric vehicles, and for storing electricity generated from alternative energy sources such as solar and wind. Commercial LIBs using organic liquid electrolytes dominate the market. However, the reactivity of liquid electrolytes at very positive or negative potentials limits the choice of suitable electrode materials and thus the available energy density. In addition, the toxicity and flammability of organic electrolytes raise serious safety concerns. As an alternative to conventional liquid electrolyte LIBs, solid-state battery (SSB) concepts using solid electrolytes (SEs) are currently under intense investigation. Among numerous classes of materials, ceramic SEs are particularly attractive due to their non-flammability, relatively high ionic conductivity at room temperature (RT) and high chemical stability in air, resulting in potentially very high intrinsic safety of the batteries. In particular, Li-containing NaSICONs (Na Super Ionic CONductors) are currently receiving a great deal of attention due to the large structural variability and high ionic conductivity that can be achieved by substituting the lattice framework with various elements. Within this class of materials, lithium aluminum germanium phosphate Li1+xAlxGe2-x(PO4)3 (LAGP) and lithium aluminum titanium phosphate Li1+xAlxTi2-x(PO4)3 (LATP) are solid-state Li-ion conductors with the highest ionic conductivity at RT. However, the main drawback of germanium and titanium-containing materials is the low electrochemical stability at negative potentials caused by the reduction of Ge4+ to Ge2+ and Ti4+ to Ti3+, which prevents the use of lithium metal anodes and reduces the energy density of the battery. To overcome this problem, the aim of this work was to increase the reduction stability of NaSICON compounds by replacing Ge and Ti with more reduction stable ions. To this end, various compositions of the type Li1+xM3+xZr2-x(PO4)3, where M3+ = Al3+, Sc3+, Y3+, were synthesized by solution-assisted solid-state reaction. The effect of Substitution on crystallographic parameters, relative density, sintering temperature, ionic conductivity, and electrochemical stability was systematically investigated. The cationic substitution of M3+ (M = Al, Sc, Y) for Zr4+ in LiZr2(PO4)3 (LZP) stabilizes the rhombohedral NaSICON structure (space group 
001043158 536__ $$0G:(DE-HGF)POF4-1222$$a1222 - Components and Cells (POF4-122)$$cPOF4-122$$fPOF IV$$x0
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001043158 9141_ $$y2025
001043158 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)165315$$aForschungszentrum Jülich$$b0$$kFZJ
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