Priceless! Please make more courses available on RUclips. Your teaching skills are too rare and valuable to not do more for the public. Thank you so much!
I can't beleive how good the rope example was. I'm somebody who works with a potentiostat but never reached such a point of general understanding of what actually happens in those wires!
Puff of air under the sheet! That got me both happy and laughing. Happy that I finally have a clear example in my mind about the situation, and laughing at how simple but close the example is.
This is great. I think I will distribute this at my Institute (Karlsruhe Institute of Technology, Institute of Applied Materials - Electrochemical Technologies). I got to know you from your talk on the ARTISTIC webinar series last year. I am currently working on electrode design for lithium ion batteries and this will help me a lot parametrizing my P2D model.
Congratulations...! You have a new subscriber. :D Frankly, I had no idea that I was going to enjoy EIS so much, until this lecture...! And I am quite surprised to see that I actually sat through the whole lecture in one go. Thank you.
greeeeat video. helped me a lot! coincidentally, i will be going to imperial college in a few months and this video is part of my preparations. what a small world...
Great video and great explanation. Really shows the amount of effort that went into this video. You have a new subscriber! :D Also, really liked the part when someone sent you flowers!
Really love this video, thank you! Do you have any good starting points about reading more about the impedance behaviour in porous systems? Especially porous electrodes would be interesting. Wouldn't that be a typical case for a semi-infinite Warburg element?
Thank you for the nice presentation! Will you consider to make a second video regarding how to model all process in a battery into the RC equivalent circuit?
Amazing lecture, Dr. Cooper! Some authors showed either faradaic and non-faradaic proccess in the diffusion bulk solution or charge transfer effects. So how can we describe this two proccess (faradaic and non-faradaic) for the Nyquist plot and the circuit equivalent components?
Excellent explanation on this topic! I have a question regarding EIS for large Li ion battery cells (over 50Ah, prismatic or pouch). the impedance of these kind of cells is significantly lower than the typical cylindrical cells so how can you "wake up" these cells?
As an EE student, I found this material is overly complicated. So the first hour is about phaser. The next part is about circuit components in series and parallel solving using phasers. Characteristic frequency is where half the current contribution is flowing from the resistor and half is on the capacitor. When you daisy-chain multiple parallel RC blocks you just have multiple taus. I watched the whole 2 hours and still didn't get the point of EIS. Do you want to sweep the frequency and look at the output response to characterize the system?
Hello, Good morning, I appreciate the knowledge shared on this channel. Studying about the EIS technique I have a doubt that I have not yet been able to solve clearly, the question is What does it mean that a material has its phase angle at lower or higher frequencies than another material? In which of these cases would there be a higher resistance to corrosion?
This was an amazing lecture Dr. Cooper. I however have one question. I understand that we obtain the capacitance of the system from the value of tau-c. What is the physical significance of the tau-c? What information does it give us about the system being measured? :-)
Thank you Emmanuel! Perhaps one way to think about it is the following: let’s say you measure a system and extract an impedance spectrum. At each frequency you now have an impedance value. If you had a simple semi-circle shape only, you might assume a parallel RC circuit. You could then immediately determine the value of R from the more frequency intercept. However in order to work out C you could either use a circuit fitting package (like Z-view) to fit the semi-circle, or instead just read off the frequency at the top of the semi-circle (remembering that tau_c = RC). Once you know C, you have to hypothesis about what is physically causing this capacitance in your system. Think of it like a blocking spring somewhere, for example, liquid ions packing densely together (due to a voltage) near the surface of an electrode. When the voltage is relaxed, the ions will spring back to a lower energy configuration. If the capacitance is very high, it might suggest that your material has a very high microscopic surface area for example.
Sam, would some "funny shape" fillers/ pigments/ additives for organic coatings impact the shape of a Nyquist plot? And, could they change the spectrum in such a way that the analyst could think there is a reaction where, in fact, it would be just a response of the system?
Thank you! I've never found an EIS textbook that I particularly like, but Matt Lacey's blog is lovely: lacey.se/science/eis/, the GAMRAY website is amazing www.gamry.com/application-notes/EIS/basics-of-electrochemical-impedance-spectroscopy/ and KIT puts out some excellent stuff.
One way to think about it is the ratio of capacity to resistance in the component. alpha=0 means no capacity (it's a resistor), alpha=1 is no resistance (its a capacitor). So you might have a kind of faulty capacitor where the more capacitance you want to access, the more energy loss (resistance) you have to pay
Hi Sam! Do you have some recommendations for SYMMETRICAL CELLS? I'm working on this and need to understand the chemistry behind it. I'll appreciate your recommendation. Thanks for your time.
I'm afraid I don't have any specific recommendations. I vaguely remember watching a great talk on this by Bernard Boukamp, but don't think it was recorded.
I'm not sure i do really. Some tips - if you do impedance at either 0% and 100% state of charge, you're gunna have a bad time because you cant lithiate more than 100% or less than 0%...
Sam! You are the boss! Next time your doorbell rings during class, it will be my flowers arriving! Thanks for the lecture
This is just amazing. Probably the best introductory lecture video I found on RUclips on EIS.
Priceless!
Please make more courses available on RUclips. Your teaching skills are too rare and valuable to not do more for the public.
Thank you so much!
I can't beleive how good the rope example was. I'm somebody who works with a potentiostat but never reached such a point of general understanding of what actually happens in those wires!
Puff of air under the sheet! That got me both happy and laughing. Happy that I finally have a clear example in my mind about the situation, and laughing at how simple but close the example is.
I love the way Dr. Cooper delivers information, always greatly enjoy your talks
This is great. I think I will distribute this at my Institute (Karlsruhe Institute of Technology, Institute of Applied Materials - Electrochemical Technologies). I got to know you from your talk on the ARTISTIC webinar series last year. I am currently working on electrode design for lithium ion batteries and this will help me a lot parametrizing my P2D model.
The best lecture for someone who wishes to brush up the EIS chapter. Thank you Sam🙏
Congratulations...! You have a new subscriber. :D Frankly, I had no idea that I was going to enjoy EIS so much, until this lecture...! And I am quite surprised to see that I actually sat through the whole lecture in one go. Thank you.
Thanks Sreejith - binge watching EIS is the best way! 😅
greeeeat video. helped me a lot! coincidentally, i will be going to imperial college in a few months and this video is part of my preparations. what a small world...
This was amazing! Vrey clear and I really liked the analogies. Thank you very much!
I enjoyed every minute of your lecture. Thank you very much!
Very kind of you to say, thanks!
As a master's student, this is the easiest course I have ever seen!! Thanks You~!
Hope it will be explained about Warburg
Thanks!!
Thank you Dr. Cooper, Quite informative to understand the basics of EIS. 😊👍🏻
Thank you. It was very informative. Concepts were explained very well. Hope to see more in this area from you
Thank you so much for the excellent lecture!
My pleasure!
Thanks a lot! This was much needed
Thank you for this excellent video. This is just amazing.
Very inspiring and rich content, thank you, Sam 👍👍👍
Fantastic video. Would be great if you can make one on analyzing the data and correlating with systems being investigated
Thank you
It is a very informative video. Thanks for your good explanation.
this is really amazing . nicely explained.
Fantastic lecture. Really enjoyed it!
Thank you for the great lecture
Great video and great explanation. Really shows the amount of effort that went into this video. You have a new subscriber! :D
Also, really liked the part when someone sent you flowers!
Really love this video, thank you! Do you have any good starting points about reading more about the impedance behaviour in porous systems? Especially porous electrodes would be interesting. Wouldn't that be a typical case for a semi-infinite Warburg element?
Thanks much for the wonderful video👍
Outstanding presentation. I like it. Great!!!
Just WOW ! ! ! Awesome ! ! !
Amazing lecture, congratulations
Very useful. thanks for the presentation 👌
I enjoyed your presentation. Thank you
Thank you for the nice presentation! Will you consider to make a second video regarding how to model all process in a battery into the RC equivalent circuit?
Absolute legend!
Excellent lecture !!
Great explanation
와... 엄청난 강의다
Thank you! :-)
Amazing lecture, Dr. Cooper! Some authors showed either faradaic and non-faradaic proccess in the diffusion bulk solution or charge transfer effects. So how can we describe this two proccess (faradaic and non-faradaic) for the Nyquist plot and the circuit equivalent components?
Thanks a lot.
Hi Dr. Cooper, thanks for the great Video.
Could you please tell me which tool you used to simulate the circuit in your animation? 😊
Just a little matlab script
T H A N K Y O U! It helps a lot. We can´t find out some of these information even in books.
Why did you stopped uploading videos. Great video this.
Really amazing lecture
Excellent explanation on this topic!
I have a question regarding EIS for large Li ion battery cells (over 50Ah, prismatic or pouch). the impedance of these kind of cells is significantly lower than the typical cylindrical cells so how can you "wake up" these cells?
Great work. I have a question. Why imaginary part is negative and what is characteristic frequency?
As an EE student, I found this material is overly complicated. So the first hour is about phaser. The next part is about circuit components in series and parallel solving using phasers. Characteristic frequency is where half the current contribution is flowing from the resistor and half is on the capacitor. When you daisy-chain multiple parallel RC blocks you just have multiple taus. I watched the whole 2 hours and still didn't get the point of EIS. Do you want to sweep the frequency and look at the output response to characterize the system?
Hello, Good morning, I appreciate the knowledge shared on this channel. Studying about the EIS technique I have a doubt that I have not yet been able to solve clearly, the question is What does it mean that a material has its phase angle at lower or higher frequencies than another material? In which of these cases would there be a higher resistance to corrosion?
This was an amazing lecture Dr. Cooper. I however have one question. I understand that we obtain the capacitance of the system from the value of tau-c. What is the physical significance of the tau-c? What information does it give us about the system being measured? :-)
Thank you Emmanuel!
Perhaps one way to think about it is the following: let’s say you measure a system and extract an impedance spectrum. At each frequency you now have an impedance value. If you had a simple semi-circle shape only, you might assume a parallel RC circuit. You could then immediately determine the value of R from the more frequency intercept. However in order to work out C you could either use a circuit fitting package (like Z-view) to fit the semi-circle, or instead just read off the frequency at the top of the semi-circle (remembering that tau_c = RC). Once you know C, you have to hypothesis about what is physically causing this capacitance in your system. Think of it like a blocking spring somewhere, for example, liquid ions packing densely together (due to a voltage) near the surface of an electrode. When the voltage is relaxed, the ions will spring back to a lower energy configuration. If the capacitance is very high, it might suggest that your material has a very high microscopic surface area for example.
Sam, would some "funny shape" fillers/ pigments/ additives for organic coatings impact the shape of a Nyquist plot? And, could they change the spectrum in such a way that the analyst could think there is a reaction where, in fact, it would be just a response of the system?
This is so great, can you please recommend some references books in this topic
Thanks
Thank you!
I've never found an EIS textbook that I particularly like, but Matt Lacey's blog is lovely: lacey.se/science/eis/, the GAMRAY website is amazing www.gamry.com/application-notes/EIS/basics-of-electrochemical-impedance-spectroscopy/ and KIT puts out some excellent stuff.
@@sajoco Thank you so much !
How Can I reach the stable state with a coating electrode? What technique can I apply before the EIS study and how I know the stable state is reached?
Can we get the presentation slides please? Loved it, helped me a lot
Link now in the description!
Thanks for the great lecture. What is alfa, I mean alfa in the Z CLE Formula, in physics?
One way to think about it is the ratio of capacity to resistance in the component. alpha=0 means no capacity (it's a resistor), alpha=1 is no resistance (its a capacitor).
So you might have a kind of faulty capacitor where the more capacitance you want to access, the more energy loss (resistance) you have to pay
@@sajoco Thank you very much! We are blessed having such a wonderful lecture.
Hi Sam!
Do you have some recommendations for SYMMETRICAL CELLS?
I'm working on this and need to understand the chemistry behind it.
I'll appreciate your recommendation.
Thanks for your time.
I'm afraid I don't have any specific recommendations. I vaguely remember watching a great talk on this by Bernard Boukamp, but don't think it was recorded.
Many thanks for your response, Sam.
I really appreciate 🙏🏿.
I'm not sure i do really. Some tips - if you do impedance at either 0% and 100% state of charge, you're gunna have a bad time because you cant lithiate more than 100% or less than 0%...
Are the other lectures in this series available publicly?
Not yet I don’t think.
Were the flowers nice?
Beautiful!
how to do it for the samples of thin film on ito , fto
1:20:43
Could you provide me a book on this topic, please.
1:01:25 that's funny
just too basic for electrical guys when he talks about basics of impedances in the first one hour unfortunately.
the math lost me
Thank you so much ! Really like the lecture.
1:15:10
1:20:43