| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Knez, Daniel
Graz University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (48/48 displayed)
- 2024Nanoscale, surface-confined phase separation by electron beam induced oxidationcitations
- 2024Three-dimensional distribution of individual atoms in the channels of beryl
- 2024Three-dimensional distribution of individual atoms in the channels of berylcitations
- 2024Phase Transitions and Ion Transport in Lithium Iron Phosphate by Atomic‐Scale Analysis to Elucidate Insertion and Extraction Processes in Li‐Ion Batteriescitations
- 2024Challenges and advances regarding LiVPO4: From HR-STEM & EELS to novel scanning diffraction techniques
- 2024STEM exploration of 2DEG at TiO2/LaAlO3 interface
- 2024Gas-Phase Synthesis of Iron Silicide Nanostructures Using a Single-Source Precursorcitations
- 2024Pulsed Laser Deposition using high-power Nd:YAG laser source operating at its first harmonics
- 2024Atom by atom analysis of defect structures in doped STO
- 2023A Guideline to Mitigate Interfacial Degradation Processes in Solid‐State Batteries Caused by Cross Diffusioncitations
- 20232D and 3D STEM Imaging and Spectroscopy: Applications and Perspectives in View of Novel STEM Infrastructure
- 2023Visualizing cellulose chains with cryo scanning transmission electron microscopy
- 2023Phase analysis of (Li)FePO4 by selected area electron diffraction and integrated differential phase contrast imaging
- 2022Phase Analysis of (Li)FePO4 by Selected Area Electron Diffraction in Transmission Electron Microscopy
- 2022Oxygen-Driven Metal–Insulator Transition in SrNbO 3 Thin Films Probed by Infrared Spectroscopycitations
- 2022Oxygen-Driven Metal–Insulator Transition in SrNbO3 Thin Films Probed by Infrared Spectroscopycitations
- 2022Vanadium and Manganese Carbonyls as Precursors in Electron-Induced and Thermal Deposition Processes
- 2022Orbital mapping of the LaAlO3-TiO2 interface by STEM-EELS
- 2022Quantifying Ordering Phenomena at the Atomic Scale in Rare Earth Oxide Ceramics via EELS Elemental Mapping
- 2022In Situ Study of Nanoporosity Evolution during Dealloying AgAu and CoPd by Grazing-Incidence Small-Angle X-ray Scatteringcitations
- 2022In Situ Study of Nanoporosity Evolution during Dealloying AgAu and CoPd by Grazing-Incidence Small-Angle X-ray Scatteringcitations
- 2022Field induced oxygen vacancy migration in anatase thin films studied by in situ biasing TEM
- 2022Precursors for Direct-Write Nanofabrication with Electrons
- 2022Challenges in the characterization of complex nanomaterials with analytical STEM
- 2022Mixed-metal nanoparticlescitations
- 2022Focused Ion Beam vs Focused Electron Beam Deposition of Cobalt Silicide Nanostructures Using Single-Source Precursorscitations
- 2022A Lithium-Silicon Microbattery with Anode and Housing Directly Made from Semiconductor Grade Monocrystalline Sicitations
- 2021Post-processing paths for orbital mapping of rutile by STEM-EELS
- 2021Automatic indexing of two-dimensional patterns in reciprocal space
- 2021Pulsed laser deposition of oxide and metallic thin films by means of Nd:YAG laser source operating at its 1st harmonicscitations
- 2021The Impact of High-Tension on the Orbital Mapping of Rutile by STEM-EELS
- 2021Spectroscopic STEM imaging in 2D and 3D
- 2020Helium droplet assisted synthesis of plasmonic Ag@ZnO core@shell nanoparticlescitations
- 2020Tuning optical absorption of anatase thin lms across the visible/near-infrared spectral regioncitations
- 2020Study on Ca Segregation toward an Epitaxial Interface between Bismuth Ferrite and Strontium Titanatecitations
- 2020Ca segregation towards an in-plane compressive strain Bismuth Ferrite – Strontium Titanate interface
- 2020Unveiling Oxygen Vacancy Superstructures in Reduced Anatase Thin Filmscitations
- 2020Ultrashort XUV pulse absorption spectroscopy of partially oxidized cobalt nanoparticlescitations
- 2019Ultra-thin h-BN substrates for nanoscale plasmon spectroscopycitations
- 2019On the passivation of iron particles at the nanoscalecitations
- 2019The impact of swift electrons on the segregation of Ni-Au nanoalloyscitations
- 2019Effects of the Core Location on the Structural Stability of Ni-Au Core-Shell Nanoparticlescitations
- 2019Atomic Structure Analysis of a Second Order Ruddlesden-Popper Ferrite-a High Resolution STEM Study
- 2018Stability of Core-Shell Nanoparticles for Catalysis at Elevated Temperaturescitations
- 2017Microstructure evolution and mechanical properties of hot deformed Mg9Al1Zn samples containing a friction stir processed zonecitations
- 2017Thermally induced breakup of metallic nanowirescitations
- 2017Inclusions in Si whiskers grown by Ni metal induced lateral crystallizationcitations
- 2016Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography
Places of action
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document
Phase analysis of (Li)FePO4 by selected area electron diffraction and integrated differential phase contrast imaging
Abstract
Lithium iron phosphate (LiFePO4) is a well-studied compound with a lot of promise as cathode material in rechargeable batteries. Due to its low cost, low toxicity, safety and the abundance of iron LFP is considered a very attractive energy storage option for the automotive industry.<br/>LiFePO4 has an orthorhombic crystal structure with Pnma space group [1]. During the discharge process lithium intercalates from a graphite anode into the FePO4 cathode, where it is stored in between FeO6 octahedra and PO4 tetrahedra, thus slightly changing the lattice vector length of the unit cell while maintaining the same crystal structure.<br/>Our aim is to better understand the lithium deintercalation process in (Li)FePO4 battery cells on atomic and macroscopic scale. Fully delithiated, fully lithiated and partially lithiated cells are prepared using chemical- and electrochemical delithiation as well as bio templating.<br/>We use Selected Area Electron Diffraction (SAED) and integrated Differential Phase Contrast imaging (iDPC) in the TEM in order to differentiate between lithiated and (partially) delithiated particles. FIB lamellas are prepared from electrochemically delithiated cells for this purpose.<br/>We also aim to compare the results from our findings in the TEM with Raman microscopy measurements. Preliminary Raman experiments on bio-templated (Li)FePO4 already showed that LiFePO4 and FePO4 phases are differentiable with their respective Raman-shift.<br/>With SAED measurements we successfully managed to differentiate between LiFePO4 and FePO4 phases as well as partially delithiated phases for single particles as seen in figure 1. High-Resolution STEM as well as iDPC imaging have confirmed the feasibility of SAED for detection of lithium content. The lattice spacings obtained by HR-STEM FFT analysis were similar to the lattice spacings obtained by SAED. Using iDPC imaging we were able to directly show the presence of lithium in a partially delithiated particle as seen in figure 3.<br/>We conclude that SAED analysis is feasible for differentiation between lithiated and (partially) delithiated states in LixFePO4 as confirmed by HR-STEM FFT analysis and iDPC imaging. Raman microscopy may provide further insight on the delithiation process on a macroscopic scale in future work.