Electric double layer capacitor (EDLC)
Hi all! I am trying to develop a model to describe a EDLC. There are some papers of COMSOL developers on this topic. In the first model, a PNP (poisson - nerst plank model) is developed. The model is...
View ArticleSpecies crossover in membrane in fuel cell
I am trying to model the crossover of species across the membrane of a fuel cell. It has multispecies flowing across either side of the membrane to the cathodes and anodes. The membrane has some fixed...
View ArticleAdding an extra dimension to 1-D battery model
Hi all, I am working on modeling and simulation of Li-ion battery. My model is pseudo-2-dimensional one. So I need an extra dimension to consider diffusion equation in solid phase of porous electrode...
View Articlestop condition error: stop condition fulfilled for initial values
I am trying to build a model of a 2D li-air battery based on the 1D li-air batt tutorial. I have made it most of the way through the model until I compute, and the error appears: stop condition...
View Articleinsulated anode and cathode in solution
Hi, I have created a 3D model in which I have an insulated anode and insulated cathode in an electrolytic aqueous solution with a known conductivity. Because the anode and cathode are insulated they...
View ArticleConstraint Force Expression
Hi, I want to ask what is meant by constraint force expression. In Vanadium Redox flow battery and electrodialysis models, the constraint force expression is set to be a test function, what does this...
View Articleoverall conductivity of the system
Hi, experts! I am novice and want to ask: Is it possible to calculate overall conductivity of the composite containing high conductive nanoparticles in almost non-conductive media? If yes, which...
View ArticleDiscussion on "Maxwell-Stefan Diffusion in a Fuel Cell Unit Cell"
I have performed the model "Maxwell-Stefan Diffusion in a Fuel Cell Unit Cell", and got some questions here: 1) The model defined some boundaries to be insulation, but the author has not stated it...
View ArticleDefining a variable limited only for the boundary
Can we define a dependent variable for a physics which is only valid for particular boundary and not for the whole domain?
View ArticleHelp with modeling resistance in current collectors for lithium-ion
Hello, I am not sure if I am in the correct area of this forum for assistance I need. I am currently working on a model for current collectors in lithium-ion batteries. More specifically the voltage...
View ArticleDefining heat source correctly
I am busy modeling batteries that heat up during use, and an airflow over the batteries to cool them. Each battery produces 12W of heat, according to the manufacturer. I have simulated it as a 2D...
View ArticleOverpotential Definition
In the user guide for the electrochemistry branch, overpotential is often defined as the difference between electric and electrolyte potential and the reversible potential, i.e. eta = phi_s - phi_l -...
View ArticleCOMSOL version 4.4 floating potential boundary condition missing
Hi I'm running an electric currents physics study and I want to apply a floating potential boundary condition. The version 4.3 manual says it exists but I can't find it in version 4.4. What's going on?...
View ArticleHelp with modeling resistance in current collectors for lithium-ion
Hello, I am not sure if I am in the correct area of this forum for assistance I need. I am currently working on a model for current collectors in lithium-ion batteries. More specifically the voltage...
View ArticleAdding Catalyst in Li Ion battery model
Hello, I am new to comsol 4.3a and I want to add a catalyst layer around electrodes. i would like to begin with adding catalyst layer in existing tutorial model and understand the changes to begin...
View ArticleLi-ion battery model, change current rate, does not converge
Hi all, I am new to COMSOL. Recently I am running a 2D Lithium ion battery model. This model converged at 1C (10A/m2), but aftering increase the current rate from 1C to 3C(30A/m2) this model does not...
View ArticleHow to put in series fuel cells
Hi everybody, I have builted a model based on the Comsol Battery & Fuel Cells Module/PEMFC/ht_pem example. In my model I would like to put several cells in serie, but i don't know how to do it. The...
View ArticleCURRENT INTERRUPT ANALYSIS
Hi everybody, I'm a new user in COMSOL and I have some problems to solve my model. I have built a fuel cell model and I would like to make some simulation on it to compare the results that will came up...
View Article3D Lithium Air Model
Hello everyone, I am trying to build a 3D Model of a Lithium-Air-battery based on the 1D Version from COMSOL's model library. Everytime I run the simulation i receive the following error after several...
View ArticleHow could I investigate particle size distribution of active materials in...
Hi all,Since in battery interfaces of COMSOL(Lithium ion battery) there is no option to change the radius of particles,how can I do that?
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