Suchergebnisse

We have developed and explored an external automatic tuning/matching (eATM) robot that can be attached to commercial and/or home-built magic angle spinning (MAS) or static nuclear magnetic resonance (NMR) probeheads. Complete synchronization and automation with Bruker and Tecmag spectrometers is ensured via transistor-transistor-logic (TTL) signals. The eATM robot enables an automated "on-the-fly" re-calibration of the radio frequency (rf) carrier frequency, which is beneficial whenever tuning/matching of the resonance circuit is required, e.g. variable temperature (VT) NMR, spin-echo mapping (variable offset cumulative spectroscopy, VOCS) and/or in situ NMR experiments of batteries. This allows a significant increase in efficiency for NMR experiments outside regular working hours (e.g. overnight) and, furthermore, enables measurements of quadrupolar nuclei which would not be possible in reasonable timeframes due to excessively large spectral widths. Additionally, different tuning/matching capacitor (and/or coil) settings for desired frequencies (e.g. $^{7}$Li and $^{31}$P at 117 and 122MHz, respectively, at 7.05 T) can be saved and made directly accessible before automatic tuning/matching, thus enabling automated measurements of multiple nuclei for one sample with no manual adjustment required by the user. We have applied this new eATM approach in static and MAS spin-echo mapping NMR experiments in different magnetic fields on four energy storage materials, namely: (1) paramagnetic $^{7}$Li and $^{31}$P MAS NMR (without manual recalibration) of the Li-ion battery cathode material LiFePO$_{4}$; (2) paramagnetic $^{17}$O VT-NMR of the solid oxide fuel cell cathode material La$_{2}$NiO$_{4+δ}$; (3) broadband $^{93}$Nb static NMR of the Li-ion battery material BNb$_{2}$O$_{5}$; and (4) broadband static $^{127}$I NMR of a potential Li-air battery product LiIO$_{3}$. In each case, insight into local atomic structure and dynamics arises primarily from the highly broadened (1-25MHz) NMR lineshapes that the eATM robot is uniquely suited to collect. These new developments in automation of NMR experiments are likely to advance the application of in and ex situ NMR investigations to an ever-increasing range of energy storage materials and systems. ; This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 655444 (O.P.). D.M.H. acknowledges funding from the Cambridge Commonwealth Trusts. J.L. gratefully acknowledges Trinity College, Cambridge (UK) for funding. K.J.G. gratefully acknowledges funding from the Winston Churchill Foundation of the United States and the Herchel Smith Scholarship. M.B. is the CEO of NMR Service GmbH (Erfurt, Germany), which manufactures the eATM device; M.B. acknowledges funding of the Central Innovation Programme for small and medium-sized enterprises (SMEs; Zentrales Innovationsprogramm Mittelstand, ZIM) of the German Federal Ministry of Economic Affairs and Energy (Bundesministerium für Wirtschaft und Energie, BMWi) under the Grant No. KF 2845501UWF. DFT calculations were performed on (1) the Darwin Supercomputer of the University of Cambridge High Performance Computing Service (http://www.hpc.cam.ac.uk), provided by Dell Inc. using Strategic Research Infrastructure Funding from the Higher Education Funding Council for England and funding from the Science and Technology Facilities Council and (2) the Center for Functional Nanomaterials cluster, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.

AbstractCarbonate-based electrolytes, known for their high solvation energy and high ionic conductivity at room temperature, present significant challenges in ultra-low temperature and fast charging applications. In the February issue of Nature, Fan and colleagues demonstrated that utilizing solvents like fluoroacetonitrile with small molecular size and low solvation energy, facilitates the creation of rapid ion-conduction ligand channels and enables the formation of an inorganic-rich interphase for high-performance ionic batteries, effectively addressing the aforementioned challenges.

Annual IEEE Energy Conversion Congress & Exposition (ECCE) (12th. 2020. Detroit, USA) ; The present work has been partially supported by the predoctoral grant programs Severo Ochoa for the formation in research and university teaching of Principado de Asturias PCTI-FICYT under the grant ID BP16-133. This work also was supported in part by the European Union's H2020 Research and Innovation programme under Grant Agreement No 864459 (UE-19-TALENT-864459).

AbstractClimate change and the low‐carbon transition are drastically changing the energy paradigm. A critical aspect is the burgeoning demand for lithium‐ion batteries and the massive amount of minerals and metals that will be required to create them. How and where these resources will be extracted, transformed, and manufactured, involve contested geopolitical interests that are currently reshaping the global energy map. This article explores the geopolitical relations and interdependencies emerging in the lithium extraction and manufacturing of lithium‐ion batteries. It discusses the characteristics of the lithium‐ion battery supply value chain to argue that lithium is not just a strategic resource. It has become a material that is part of a much larger geopolitical energy transformation, with China emerging as the primary global force in terms of technology and battery manufacturing. The article then analyzes the governance frameworks of the South American salt flats of Bolivia, Chile, and Argentina, which show a heterogeneous panorama in terms of economic structures and business strategies. Both condition new forms of interdependencies with China in terms of business networks and market access.

Annual IEEE Energy Conversion Congress & Exposition (ECCE) (12th. 2020. Detroit, USA) ; The present work has been partially supported by the European Union's H2020 Research and Innovation programme under Grant Agreement No 864459 (UE-19-TALENT-864459) and the Ministry of Science, Innovation and Universities by the Industrial Doctorates programme reference DIN2018-009853B98667264. This work also was supported by the predoctoral grants program FPU for the formation in university teaching of Spain MECD under the grant IDs FPU16/06829 and FPU16/05313.

This latest CSIS Scholl Chair white paper outlines the technical details behind the production of the active battery materials stage of the lithium-ion battery supply chain and how U.S. government policies are impacting friendshoring efforts in the sector.