A5062376472- Advanced Battery Technologies Research
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Advanced battery technologies research
- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Supercapacitor Materials and Fabrication
- Sensor Technology and Measurement Systems
- Layered Double Hydroxides Synthesis and Applications
- Electrochemical Analysis and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Fault Detection and Control Systems
- Extraction and Separation Processes
- Force Microscopy Techniques and Applications
- Neuroscience and Neural Engineering
- Machine Learning in Materials Science
- Inorganic Chemistry and Materials
- Green IT and Sustainability
- Electrodeposition and Electroless Coatings
- Electric and Hybrid Vehicle Technologies
- Chemical Synthesis and Characterization
- Advanced Photocatalysis Techniques
- Plasma Diagnostics and Applications
- Organic Electronics and Photovoltaics
National Institute of Chemistry
2016-2025
University of Ljubljana
2018-2019
Community Health Centre Ljubljana
2011
Li insertion electrodes are made by pressing a mixture of active material and additives on metallic substrate. Here we estimate how various interphase contacts affect the electrode kinetics. We apply variable external mechanical pressure onto different cathodes measure their impedance response. Similar experiments performed dry composites in contact with: Al or Cu foil, Ag paste. Most surprisingly, find that high-frequency arc is due to between metal material. This fundamental contradiction...
In the literature, interpretation of electrochemical impedance spectra measured on insertion cathode materials is far from being unique. most cases, various arbitrarily selected equivalent circuits have been used for analysis whereby criterion merit has mainly quality fit. Herein, we propose a different approach. We try to explain main features such as high and medium frequency arcs low diffusional tail using convenient (simplified) derived quite general description due particulate (porous)...
Physics based transmission line models (TLMs) are a convenient tool for the analysis of impedance response electrochemical systems – most prominent examples being double-layer capacitors, solar cells, and batteries. TLMs can provide good quali- quantitative evaluation main transport-reaction steps occurring in given system - at moderate mathematical effort. This mini review focuses on theoretical development application TLM schemes porous battery electrodes other components. After short...
This paper outlines a critical analysis of the currently available methodological framework for comprehensive and reliable interpretation impedance spectroscopy data aprotic lithium-based secondary batteries. Impedance is powerful experimental technique that can be used to assess batteries over range frequencies. However, in typical battery configurations, all components contribute response whole cell overlap many different responses often results complex curve not easily easy interpret....
Cycling and post-mortem analysis of Li batteries • Comprehensive electrodes from fresh cycle aged
State-of-the-art battery cells are composed of complex heterogeneous electrode structures that pose significant challenges for analyzing electrochemical processes. Traditional impedance spectroscopy (EIS) techniques require system simplification and equilibrium conditions, which limit their ability to capture dynamic processes during operation. This paper introduces an advanced method, combines operando measurements with real-time monitoring overvoltage in a three-electrode cell setup....
The impact of the solid film deposit (mainly Li2S) on complex electrochemistry a Li–S cell is studied in detail. Already simple, straightforward experiment strongly indicates that this might be much smaller than usually assumed. Notably, similar phenomenon demonstrated for another battery operated same basic principle: magnesium–sulfur battery. In order to better detect surface-specific phenomena associated with formation and properties surface deposit, we construct special electrochemical...
Polysulfides are central compounds in lithium-sulfur battery cells. However, the fundamental redox and diffusion properties of polysulfides still poorly understood. We try to fill this gap by performing an accurate impedance spectroscopy investigation using symmetrical cells consisting two planar glassy carbon electrodes separated with catholyte-soaked separator. The catholyte contains a mixture selected predetermined nominal concentrations. Impedance measurements reveal textbook shapes...
Transmission line modeling (TLM) has become an important approach for analysis of measured impedance spectra battery cells. Still, the existing models lack some features which prevents a full and accurate spectra. Here we present general physics-based TLM that contains all processes known from treatments transport/reaction schemes based on Newman porous electrode model or corresponding Poisson-Nernst-Planck framework. Compared to previous TLMs, additionally takes into account movement...
Abstract Electrochemical impedance spectroscopy (EIS) is a valuable tool, which frequently applied to study lithium‐sulfur (Li‐S) batteries. However, as shown in this perspective article, there are several pitfalls associated with the measurement parameters, response interpretation, and spectra fitting, can result dubious or erroneous conclusions. In first part, available information on Li‐S battery summarized it critically evaluated. The authors also touch methodology of measurements...
Various impedance-based and nonlinear frequency response-based methods for determining the state-of-health (SOH) of commercial lithium-ion cells are evaluated. Frequency measurements provide a spectral representation dynamics underlying physicochemical processes in cell, giving evidence about its internal physical state. The investigated can be carried out more rapidly than controlled full discharge thus constitute prospectively efficient measurement procedures to determine SOH aged cells....
A transmission line model for approximate description of measured impedance response selected battery cell types and other electrochemical systems is introduced based on known general solutions from the literature. It contains two branches that can capture transport features due to migration diffusion charge between electrodes. Importantly, 4 terminal elements describing interaction with electrodes are optional. This makes applicable asymmetrical electrodes, as commonly met in practical...
In this study, a gel polymer electrolyte (GPE) based on ionic liquid (PIL) is used in solvent-free and hybrid configuration for Li-S batteries. Results obtained the show high discharge capacity first cycle excellent coulombic efficiency during cycling. Capacity fading polarization increase cycling are explained XPS EIS measurements. The results of present study indicating that various internal resistance contributions related with an accumulation polysulfides GPE-PIL layer or/and surface...
Abstract The rational design of electrochemical oxygen evolution reaction (OER) electrocatalyst is essential for the development efficient and sustainable energy conversion, storage electrolysis applications. One remaining limitations low‐temperature electrolyzers large amounts highly scarce expensive iridium used as OER electrocatalysts. This could be solved by applying much smaller on stable support. Here we present a very promising functionality titanium oxynitride (TiON x )...
Electrochemical impedance spectroscopy (EIS) is a widely used means for characterization of the dynamics batteries and electrochemical energy conversion systems in general. EIS useful on-line condition monitoring since it contains valuable information on internal batteries. The conventional approach to relies their successive excitation with mono-component sinusoidal signals at pre-defined frequencies. When inferring about battery's state-of-health, low-frequency part characteristic...
Hysteresis is a general phenomenon regularly observed in various materials. Usually, hysteretic behavior an intrinsic property that cannot be circumvented the nonequilibrium operation of system. Herein, it shown that, at least with regard to phase-separating battery materials, possible enter (deeply) loop finite currents. This newly electric response electrode, which inherent related its microscopic origin arising from (significant) share active material residing intraparticle...
Preparation of conductive coatings is an effective way for improvement kinetics in Li battery materials. Although carbon-based are most often used, they have been studied less systematically than, example, phosphides or phosphocarbides. In this study we tried to find the important correlations between preparation conditions and resulting composition, morphology, electrical properties selected carbon-coated As a model substrate material mainly used particles while as carbon precursor employed...
The paper proposes an advanced continuum level modelling framework characterized by a more consistent virtual representation of electrode topology to enhance prediction capability and generality porous theory based models. proposed framework, therefore, establishes the missing link between mesoscopic scale with detailed 3D single cell scale, where interrelation real was missing. This is established elaborating unified approach for materials significantly different topologies active material...