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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Enabling a non-flammable methyl(2,2,2-trifluoroethyl) carbonate electrolyte in NMC622-graphite Li-ion cells by electrode pre-passivation Matilde Longhini , Florian Gebert , Fosca Conti , Andrew J. Naylor Energy Advances DOI: 10.1039/D4YA00052H Diamond Proposal Number(s): [30357] Open Access Show Abstract ▼ Abstract: Novel lithium-ion battery electrolytes often exhibit poor electrochemical stability against typical commercial layered oxide and graphite electrodes. Pre-passivating the electrodes prior to cell assembly with an electrically insulating, ionically conductive solid-electrolyte interphase (SEI) is one innovative strategy for stabilising systems with otherwise unusable electrolytes. Here, methyl(2,2,2-trifluoroethyl) carbonate (FEMC), a promising non-flammable electrolyte solvent that is generally unstable against graphite, is utilised after pre-passivation of electrodes with a state-of-the-art carbonate-based electrolyte. A significant improvement in performance is observed compared with the untreated electrodes. Hard X-ray photoelectron spectroscopy was used to probe the interphase layer composition.	Apr 2024
B18-Core EXAFS	Rapid sintering of Li6.5La3Zr1Nb0.5Ce0.25Ti0.25O12 for high density lithium garnet electrolytes with current induced in-situ interfacial resistance reduction Mark P. Stockham , Bo Dong , Matthew S. James , Pengcheng Zhu , Emma Kendrick , Peter R. Slater Energy Advances DOI: 10.1039/D3YA00123G Diamond Proposal Number(s): [14239] Open Access Show Abstract ▼ Abstract: A primary target of energy storage is the all solid state battery, however finding a suitable solid state electrolyte has proven troublesome. Lithium garnet materials are promising solid state electrolytes with high room temperature conductivity, a wide electrochemical window, high chemical stability with Li metal and have minimal hazards. However, lithium garnets suffer from slow, energy demanding synthesis, rapid proton exchange (leading to high interfacial resistance between the garnet and electrodes), mechanical instabilities with Li metal and require specific handling methods to achieve the highest performing materials (such as full processing under Ar). Here we report a Ti/Ce co-doped high entropy lithium garnet material with four B site dopants, with the formula Li6.5La3Zr1Nb0.5Ce0.25Ti0.25O12. This material benefits from rapid simultaneous sintering and densification directly from the starting materials, allowing formation of dense pellets in <1hr at 1100°C using only a standard, cheap, muffle furnace. Li6.5La3Zr1Nb0.5Ce0.25Ti0.25O12 also has high conductivity (0.5 mS cm-1 at 25°C), scalability and insensitivity to both rapid furnace ramp rates and long dwell times. There is also an indication of unusual behaviour towards limiting lithium dendrite propagation, which is also discussed.	Aug 2023

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