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• W3002070111 abstract "Solid-state electrolytes (SSEs) are of significant interest for their promise as lithium ion conducting materials but are prone to degradation due to lithium carbonate formation on the surface upon exposure to atmosphere, adversely impacting Li ion conduction. In situ x-ray photoelectron spectroscopy monitored changes in the composition of the SSE Li garnet [Li6.5La3Zr1.5Ta0.5O12 (LLZTaO)] upon annealing in ultrahigh vacuum (UHV) and upon Ar+ ion sputtering. Trends in core level spectra demonstrate that binding energy (BE) calibration of the Li 1s at 56.4 eV yields a more consistent interpretation of results than the more commonly used standard of the adventitious C 1s at 284.8 eV. Annealing one ambient-exposed sample to &gt;1000 K in UHV effectively reduced surface carbonate and oxygen, leaving significant amounts of carbon in lower oxidation states. A second ambient-exposed sample was subjected to 3 keV Ar+ ion sputtering at 500 K in UHV, which eliminated all surface carbon and reduced the O 1s intensity and BE. These methods present alternative approaches to lithium carbonate removal than heating or polishing in inert atmospheres and are compatible with fundamental surface science studies. In particular, the data show that sputtering at mildly elevated temperatures yields facile elimination of carbonate and other forms of surface carbon. This is in contrast to annealing in either UHV or noble gas environments, which result in carbonate reduction, but with significant remnant coverages of other forms of carbon." @default.
• W3002070111 created "2020-01-30" @default.
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• W3002070111 date "2020-01-21" @default.
• W3002070111 modified "2023-10-16" @default.
• W3002070111 title "<i>In situ</i> x-ray photoelectron spectroscopy study of lithium carbonate removal from garnet-type solid-state electrolyte using ultra high vacuum techniques" @default.
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• W3002070111 doi "https://doi.org/10.1116/1.5128102" @default.
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