Search results for: Arnulf Latz

Items from 1 to 15 out of 15 results

article

Voltage Hysteresis of Silicon Nanoparticles: Chemo‐Mechanical Particle‐SEI Model

Lukas Köbbing, Arnulf Latz, Birger Horstmann

Advanced Functional Materials > 34 > 7 > n/a - n/a

Silicon is a promising anode material for next‐generation lithium‐ion batteries. However, the volume change and the voltage hysteresis during lithiation and delithiation are two substantial drawbacks to their lifetime and performance. The reason for the voltage hysteresis in amorphous silicon nanoparticles covered by a solid‐electrolyte interphase (SEI) is investigated. Concentration gradients inside...

article

Microstructure‐ and Theory‐Based Modeling and Simulation of Batteries and Fuel Cells

Arnulf Latz, Timo Danner, Birger Horstmann, Thomas Jahnke

Chemie Ingenieur Technik > 91 > 6 > 758 - 768

The quality of digitalized design and development processes for advanced electrochemical technologies depends crucially on the accuracy of available models and the level of details at which simulations can be performed. In this article, an overview is given over recent advances in developing coupled models of transport and electrochemistry and simulation tools to investigate and modify very detailed...

article

Modeling nucleation and growth of zinc oxide during discharge of primary zinc-air batteries

Johannes Stamm, Alberto Varzi, Arnulf Latz, Birger Horstmann

Journal of Power Sources > 2017 > 360 > C > 136-149

Metal-air batteries are among the most promising next-generation energy storage devices. Relying on abundant materials and offering high energy densities, potential applications lie in the fields of electro-mobility, portable electronics, and stationary grid applications. Now, research on secondary zinc-air batteries is revived, which are commercialized as primary hearing aid batteries. One of the...

article

Parametric stochastic 3D model for the microstructure of anodes in lithium-ion power cells

Daniel Westhoff, Julian Feinauer, Klaus Kuchler, Tim Mitsch, more

Computational Materials Science > 2017 > 126 > C > 453-467

The microstructure of anodes in lithium-ion batteries has a strong influence on their electrochemical performance and degradation effects. Thus, optimizing the morphology with respect to functionality is a main goal in battery research. Doing so experimentally in the laboratory causes high costs with regard to time and resources. One way to overcome this problem is the usage of parametric 3D microstructure...

article

Stochastic microstructure modeling and electrochemical simulation of lithium-ion cell anodes in 3D

Simon Hein, Julian Feinauer, Daniel Westhoff, Ingo Manke, more

Journal of Power Sources > 2016 > 336 > Complete > 161-171

Thermodynamically consistent transport theory is used to compare 3D images of real anode microstructures from lithium-ion batteries to virtual ones created by a parametric stochastic 3D microstructure model. Half-cell simulations in 3D with spatially resolved microstructures at different applied currents show that for low currents the deviations between various electrochemical quantities like current...

article

Thick electrodes for Li-ion batteries: A model based analysis

Timo Danner, Madhav Singh, Simon Hein, Jörg Kaiser, more

Journal of Power Sources > 2016 > 334 > C > 191-201

Li-ion batteries are commonly used in portable electronic devices due to their outstanding energy and power density. A remaining issue which hinders the breakthrough e.g. in the automotive sector is the high production cost. For low power applications, such as stationary storage, batteries with electrodes thicker than 300 μm were suggested. High energy densities can be attained with only a few electrode...

article

Characterization of gas diffusion electrodes for metal-air batteries

Timo Danner, Santhana Eswara, Volker P. Schulz, Arnulf Latz

Journal of Power Sources > 2016 > 324 > C > 646-656

Gas diffusion electrodes are commonly used in high energy density metal-air batteries for the supply of oxygen. Hydrophobic binder materials ensure the coexistence of gas and liquid phase in the pore network. The phase distribution has a strong influence on transport processes and electrochemical reactions. In this article we present 2D and 3D Rothman-Keller type multiphase Lattice-Boltzmann models...

article

Influence of local lithium metal deposition in 3D microstructures on local and global behavior of Lithium-ion batteries

Simon Hein, Arnulf Latz

Electrochimica Acta > 2016 > 201 > C > 354-365

One of the major degradation processes in lithium ion batteries is the deposition of metallic lithium on the surface of the active particles in the negative electrode. In this paper we present a fully 3D microstructure resolved simulation of the influence of plated lithium on the cell potential during discharge depending on the amount and position of plated lithium. Our simulations give insight on...

chapter

Modeling of Species and Charge Transport in Li–Ion Batteries Based on Non-equilibrium Thermodynamics

Arnulf Latz, Jochen Zausch, Oleg Iliev

Lecture Notes in Computer Science > Numerical Methods and Applications > Modeling and Simulation of Electrochemical Processes > 329-337

In order to improve the design of Li ion batteries the complex interplay of various physical phenomena in the active particles of the electrodes and in the electrolyte has to be balanced. The separate transport phenomena in the electrolyte and in the active particle as well as their coupling due to the electrochemical reactions at the interfaces between the electrode particles and the electrolyte...

article

Modeling of nano-structured cathodes for improved lithium-sulfur batteries

Timo Danner, Guanchen Zhu, Andreas F. Hofmann, Arnulf Latz

Electrochimica Acta > 2015 > 184 > C > 124-133

Some of the most remarkable improvements in the cycle life of Li-S batteries could be achieved by nano-structuring of the sulfur/carbon (S/C) cathode material. Meso- and micro-porous particles, carbon nano tubes, and other sophisticated structures are used to actively retain highly soluble polysulfides which are responsible for capacity fading and a short cycle life. In this article we present a detailed...

article

Thermodynamic derivation of a Butler–Volmer model for intercalation in Li-ion batteries

Arnulf Latz, Jochen Zausch

Electrochimica Acta > 2013 > 110 > Complete > 358-362

We present an exclusively thermodynamics based derivation of a Butler–Volmer expression for the intercalation exchange current in Li ion insertion batteries. In this first paper we restrict our investigations to the actual intercalation step without taking into account the desolvation of the Li ions in the electrolyte. The derivation is based on a generalized form of the law of mass action for non...

article

Numerical simulation of traveling wave-induced electroconvection

Sebastian Schmidt, Arnulf Latz

Microfluidics and Nanofluidics > 2012 > 13 > 3 > 421-428

A method is presented for simulating the convection in fluid flows induced by high frequency electric fields typical, e.g. for electrohydrodynamic pumping in microchannels. Time scale separation between electric field frequency and hydrodynamic flow scales is explicitly taken into account in the derivation of the model. A finite volume numerical scheme is presented which resolves the problem three...

article

Comparative numerical study of two concentrated fiber suspension models

Arnulf Latz, Uldis Strautins, Dariusz Niedziela

Journal of Non-Newtonian Fluid Mechanics > 2010 > 165 > 13-14 > 764-781

We consider two rheological models for concentrated fiber suspensions. In both models the equations for orientation and flow are fully coupled, i.e., the orientation influences the flow via a constitutive relation for the viscosity and the orientation of the fibers is determined by the flow field. The orientation state of the fibers is characterized by the Advani–Tucker orientation tensor. We are...

article

Hydrodynamic modeling of dilute and dense granular flow

Arnulf Latz, Sebastian Schmidt

Granular Matter > 2010 > 12 > 4 > 387-397

We study numerically a continuum model for granular flow, which covers the regime of fast dilute flow as well as slow dense flow up to vanishing velocity. The constitutive relations at small and intermediate densities are equivalent to those derived from kinetic theory of granular flow. The existence of an inherent instability due to the vanishing kinetic or collisional pressure for small granular...

article

Flow-driven orientation dynamics of semiflexible fiber systems

Uldis Strautins, Arnulf Latz

Rheologica Acta > 2007 > 46 > 8 > 1057-1064

We study the flow-induced orientation dynamics of semiflexible fibers in dilute fiber suspensions. Starting from the equations of motion for a two-rod model of flexible fibers in Stokes flow, the Smoluchowski equation for a connected monomer orientation distribution function is derived. We then obtain a set of equations for the time dependence of the first and second moments of the orientation distribution...

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