Introductory lecture on redox reactions and batteries for MSE juniors. Recorded Spring 2020 Leave a comment if I got something wrong. Happy to receive feedback. Checkout our undergraduate journal: sites.google.com/uw.edu/urmse...
This is very intense. A giant learning curve when you try to break down all the moving parts of batteries. It was enough to understand the working principles of batteries. Thank goodness for AI. Must know a little bit of everything. Basic redox, to structures of crystals to hold the ions. To battery expansion with anodes.This is a field when you must have happy accidents. I have been struggling with this topic for years. You did a good job of explaining the difficulties in this complex field.
@@parisamolaeipour781 Good question. At high rate it takes less time to reach theoretical capacity simply because we are moving electrons faster, i.e. the rate of absorbing ions is faster. However, another phenomenon occurs at higher rate, that reduces the capacity obtained during the test. This is due to polarization effects, such as concentration drop between the electrolyte and electrode, and bulk resistance. These are essentially kinetic penalties, thus arises an overpotential to maintain the constant current condition, so the voltage rises faster and reaches the cut-off point sooner.
"we slice the sodium, and inside the glovebox we have a pasta roller... and so we put the sodium chunk in the pasta roller... and then we take a circle punch and make the chips of sodium". Hilariously practical!
Great stuff! How would one make a aqueous capacitor? If you had a inconsistent voltage with minimal potential to very high potential? The ion flow from a trickle to a high voltage burst?
Dear Zach, what would be your recommendation ( having recently completed your post graduate studies) on a few nice recent textbooks on batteries. Thank you.
Please make a tutorial on electrochemistry Zach. Maybe for beginner like me. I'm a chemical engineer so I do not know any electrochemistry stuff at all
Hi, I am working on battries and hjave zero background knowledge how can I improve this.. basics specifically .kindly uplod more lectures to understand basics
For batteries or electrochemistry? As an EE you may be more interested in cell design and construction. If you are more interested in materials, then a fundamental background in chemistry is required. But both these aspects will be important when considering manufacturing of batteries.
To reduce vanadium 5+ to 4+ it takes 1 electron, but in every unit of V2O5 there are two units of V, so it takes two units of electrons to reduce all vanadium to 4+. Thus, it takes 2 mol electrons to reduce 1 mol V2O5.
