A5031630476- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Copper Interconnects and Reliability
- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- Electronic Packaging and Soldering Technologies
- Advanced Battery Technologies Research
- Microstructure and mechanical properties
- Semiconductor materials and interfaces
- Extraction and Separation Processes
- Transition Metal Oxide Nanomaterials
- Advanced materials and composites
- Aluminum Alloys Composites Properties
- Microstructure and Mechanical Properties of Steels
- Supercapacitor Materials and Fabrication
- Integrated Circuits and Semiconductor Failure Analysis
- Anodic Oxide Films and Nanostructures
- 3D IC and TSV technologies
- Ferroelectric and Piezoelectric Materials
- Advanced battery technologies research
- Nuclear materials and radiation effects
- MXene and MAX Phase Materials
- Hydrogen embrittlement and corrosion behaviors in metals
- Inorganic Fluorides and Related Compounds
- Force Microscopy Techniques and Applications
Karlsruhe Institute of Technology
2014-2025
Applied Materials (Germany)
2013-2025
Helmholtz-Institute Ulm
2013-2020
Universität Ulm
2020
Applied Materials (United Kingdom)
2015-2020
Helmholtz Association of German Research Centres
2015
Max Planck Institute for Intelligent Systems
2002-2012
Max Planck Society
2002-2012
University of Tennessee at Knoxville
2011
FIZ Karlsruhe – Leibniz Institute for Information Infrastructure
2010
In the near future, targets for lithium-ion batteries concerning specific energy and cost can advantageously be met by introducing layered LiNixCoyMnzO2 (NCM) cathode materials with a high Ni content (x ≥ 0.6). Increasing allows utilization of more lithium at given cell voltage, thereby improving capacity but expense cycle life. Here, capacity-fading mechanisms both typical low-Ni NCM = 0.33, NCM111) high-Ni 0.8, NCM811) cathodes are investigated compared from crystallographic...
The strength of metal crystals is reduced below the theoretical value by presence dislocations or flaws that allow easy nucleation dislocations. A straightforward method to minimize number defects and presumably increase its crystal quality reduce size. Here, we describe successful fabrication high aspect ratio nanowhiskers from a variety face-centered cubic metals using temperature molecular beam epitaxy method. atomically smooth, faceted surfaces absence confirmed transmission electron...
This review examines the size effects observed in mechanical strength of thin metal films and small samples such as single-crystalline pillars, whiskers, wires. Experimental results from testing electron microscopy studies, well recent insights discrete dislocation dynamics simulations, are presented. The dependency deformation may be separated into three regimes: nanometer regime roughly 100 nm below, an intermediate between approximately 1 μm, a bulk-like regime. We argue that there is no...
The synergistic engineering of chemical complexity and crystal structures has been applied to Prussian blue analogue (PBA) cathodes in this work. More precisely, the high-entropy concept successfully introduced into two structure types identical composition, namely, cubic monoclinic. Through utilization a variety complementary characterization techniques, comprehensive investigation electrochemical behavior monoclinic PBAs conducted, providing nuanced insights. implementation exhibits...
Microcompression tests were performed on focused-ion-beam-machined micropillars of several body-centered-cubic metals (W, Mo, Ta, and Nb) at room temperature. The relationship between yield strength pillar diameter as well the deformation morphologies found to correlate with a parameter specific for bcc metals, i.e., critical temperature T(c). This finding sheds new light phenomenon small-scale plasticity in largely unexplored non-fcc metals.
Lithium-ion battery electrodes contain a substantial amount of electrochemically inactive materials, including binders, conductive agents, and current collectors. These extra components significantly dilute the specific capacity whole thus have led to efforts utilize foils, for example, Al, as sole anode material. Interestingly, literature has many reports fast degradation Al electrodes, where less than dozen cycles can be achieved. However, in some studies, anodes demonstrate stable cycling...
Abstract The anode/electrolyte interface behavior, and by extension, the overall cell performance of sodium‐ion batteries is determined a complex interaction processes that occur at all components electrochemical across wide range size‐ timescales. Single‐scale studies may provide incomplete insights, as they cannot capture full picture this intertwined behavior. Broad, multiscale are essential to elucidate these processes. Within perspectives article, several analytical theoretical...
The recent interest in size-dependent deformation of micro- and nanoscale materials has paralleled both technological miniaturization advancements imaging small-scale mechanical testing methods. Here we describe a quantitative situ nanomechanical approach adapted to dual-beam focused ion beam scanning electron microscope. A transducer based on three-plate capacitor system is used for high-fidelity force displacement measurements. Specimen manipulation, transfer, alignment are performed using...
Sodium-ion batteries may develop into a cost-efficient alternative to lithium-ion batteries. Na3V2(PO4)3/C (NVP/C) is known be suitable electrode material for such that can used as an anode or cathode. Here, NVP/C-based electrodes were investigated in different cell configurations. The cycled against the materials hard carbon, Sb/C, SnSb/C, and sodium metal. Furthermore, NVP versus was investigated. When NVP/C other materials, cells exhibit relatively poor reliability, but NVP–NVP cells,...
Attempts to use aluminum-based anodes in lithium-ion batteries often fail due fast capacity fading. Generally, this has been attributed pulverization of the electrode and large volume changes associated with phase transformation between crystalline α β phases Li-Al alloys. In study, these transformations were investigated aluminum films that lithiated either electrochemically or via direct reaction lithium metal. Scanning electron microscopy was used image samples at different stages...
An experimental method is described for performing thermal fatigue testing of thin films and lines on substrates. The uses Joule heating from alternating currents to generate temperature, strain, stress cycles in the metal structures. apparatus has been installed a scanning electron microscope allows situ observations damage evolution. First Cu reveal that forms submicrometer thick strongly affected by film thickness grain size. In addition, results special test structure confirm caused not...
A component of the compressive stress that develops during deposition polycrystalline thin films reversibly changes interruptions growth. The mechanism responsible for this phenomenon has been subject much recent speculation and experimental work. In Letter, we have varied in-plane grain size columnar gold with a fixed thickness, by varying their thermal history. Without vacuum break, in these was then measured situ growth Homoepitaxial were similarly characterized as part study. inverse...
We present experimental results for uniaxial tensile and creep testing of fully lithiated silicon nanowires. A reduction in the elastic modulus is observed when nanowires are alloyed with lithium plastic deformation becomes possible wires saturated lithium. Creep was performed at fixed force levels above below strength material. linear dependence strain-rate on applied stress evident yield alloy, indicating viscous behavior. The inverse exponential relationship between wire radius strain...
In this work, we investigate the mechanical properties of silicon nanowires, which have been subjected to in situ electrochemical alloying and de-alloying with lithium inside a scanning electron microscope (SEM). Following de-alloying, tensile testing wires was performed SEM using microelectromechanical force sensor piezo-driven actuator. Compared pristine de-alloyed show significant decrease both their elastic modulus as well ultimate strength indications that newly formed amorphous layer...