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New nanosized metal oxy-FLUOrides: tailored SYNthesis and Energy Storage

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Fluorides to store more energy in lithium batteries

In the quest to find new ways to build batteries of enhanced energy density, electrodes based on metal fluorides seem to offer an exciting potential.


Although lithium-ion batteries have cemented their place in a wide range of applications, current technologies are struggling to meet the demand for even better energy density. This has spurred a lot of research into electrode materials that can function in a conversion mode; in such systems, lithium undergoes a reversible electrochemical reaction with a metal oxide. Metal fluorides can be used as conversion materials in lithium-ion batteries. Within the EU-funded project FLUOSYNES (New nanosized metal oxy-fluorides: Tailored synthesis and energy storage), researchers developed new synthetic routes for the preparation of nano-sized particles of transition metal oxyfluoride with particular focus on iron- and titanium-based compounds. Using sol-gel techniques, the team studied how the fluorinating medium and the solvent concentration impact on the stability of titanium-based compounds, and then revealed the metal formation mechanism. Their study proved the complexity of titanium-based compounds and revealed how to optimise the material’s properties by tuning its composition and morphology. The team also examined iron oxyfluoride as a potential electrode material for lithium-ion batteries. Meticulous attention was devoted to the thermal decomposition of the precursor material and how this creates anionic vacancies in iron oxyfluoride. FLUOSYNES carried out research into next-generation cathode materials that should offer more capacity than today’s battery technologies.


Energy density, electrodes, metal fluorides, lithium-ion batteries, FLUOSYNES, titanium

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