If you using the Won-A tech system for electrochemical testing, you can output the dV/dQ. Hope you can find this data in the your electrochemical system.
Dear Prof. Veg, In my experiment, Ni-rich cathode materials were tested in voltage range from 2.5 ~ 4.25 V. In first graph, I do not control voltage value at 4.25 V, therefore, I should be resetting process .
Hello, Thank you for this helpful video. Could you please help me in my work and evaluation using differential voltage analysis? I am stuck in the initial stages and I would really be grateful for your help. How may I contact you?
Great video! One question: for the raw data, if you plot the original voltage vs capacity curve, would it be a loop curve or like an “X” curve where capacity always starts at 0 at the beginning of every charge AND discharge? hope you understand what I am asking
Yes, it's right! because of the during battery cycle changes from charge to discharge state, the specific capacity value is zero; therefore, the dQ/dV ~ 0. Example in my experiment, the cut-off voltage of 2.5 - 4.25; after charge process, first value of capacity in discharge is 0 (at 4.233 V) --> dQ/dV = 0/4.23 = 0.
@@Satish-md1vm have you tried changing the number of points? Do you see a voltage plateau at that specific voltage in the voltage profile? Maybe low capacity?
@@HVC-VN Indeed thank you very much for uploading this video. I've got very nice ageing curves with this method but I was wondering what was the name of the first song? :)
@@HVC-VN ahah no worries about the song. I have just one more question regarding your plots. As i understood the downwards plot is referred to the charge, but why the values of the derivative are negative? Mine remain positive! Thanks a lot again Moreover, i discovered that interpolating operation brings to a value matrix longer than the effective length of data carrying at the end to x-axis (voltage) and y-axis (dQ/dV) to have different length. That unaviodable false the information given by the plot! :(
Perfect! So quick and direct.
great, thanks for uploading
super video 👍🏻👍🏻👍🏻👍🏻👍🏻💓💓💓💓🌷🌷🌷🌷🌷
Thank you 99999
thanks so much
How would you do dV/dq curves? I'm looking for tutorials to plot the DVA curves but cannot find any. Hope you can help
If you using the Won-A tech system for electrochemical testing, you can output the dV/dQ. Hope you can find this data in the your electrochemical system.
Hi Thanks for showing. Question, why did you delete the first graph??
Dear Prof. Veg,
In my experiment, Ni-rich cathode materials were tested in voltage range from 2.5 ~ 4.25 V. In first graph, I do not control voltage value at 4.25 V, therefore, I should be resetting process .
If you have time, you can see fully graph in this paper: doi.org/10.1002/ente.202000800
Hello, Thank you for this helpful video. Could you please help me in my work and evaluation using differential voltage analysis? I am stuck in the initial stages and I would really be grateful for your help. How may I contact you?
Hello, nice to see your comment. If you want to any help, you can contact me via email chuonghv.bkav@gmail.com.
Great video! One question: for the raw data, if you plot the original voltage vs capacity curve, would it be a loop curve or like an “X” curve where capacity always starts at 0 at the beginning of every charge AND discharge? hope you understand what I am asking
Yes, it's right! because of the during battery cycle changes from charge to discharge state, the specific capacity value is zero; therefore, the dQ/dV ~ 0. Example in my experiment, the cut-off voltage of 2.5 - 4.25; after charge process, first value of capacity in discharge is 0 (at 4.233 V) --> dQ/dV = 0/4.23 = 0.
what is reason of setting the number of points to 110?
makes smoother line I believe
@@MikeEnergy_ Do you have to keep 110 for all of them to keep consistency or no need?
@@Satish-md1vm good question! Not sure to be honest. I would think so
@@MikeEnergy_ When I plotted dv/dq I was not noticing any peaks for cathode. It's strange. Do you know why?
@@Satish-md1vm have you tried changing the number of points? Do you see a voltage plateau at that specific voltage in the voltage profile? Maybe low capacity?
trackid?
No, this method provides more information in lithium batteries during charge/discharge.
@@HVC-VN Indeed thank you very much for uploading this video. I've got very nice ageing curves with this method but I was wondering what was the name of the first song? :)
@@pieroangela6485 Nice, and funny, unfortunately, I can not remember first song's name!!!
@@HVC-VN ahah no worries about the song. I have just one more question regarding your plots. As i understood the downwards plot is referred to the charge, but why the values of the derivative are negative? Mine remain positive! Thanks a lot again
Moreover, i discovered that interpolating operation brings to a value matrix longer than the effective length of data carrying at the end to x-axis (voltage) and y-axis (dQ/dV) to have different length. That unaviodable false the information given by the plot! :(
@@pieroangela6485 Banger 2022 - Venom Beats is the music :)