Can you explain the role of anions such as ClO4-, PF6- and (CF3SO3)2- in charge-discharging process of Li-ion battery?

I have been testing for bulk resistance of hydrogel electrolyte. I have obtained the following Nyquist Plot. I would like to know how to explain and get more information on this specific shape.

I want to calculate the strains and the cristallites size using fullprof refinement. I followed the necessary steps by creating an .irf file but the generated .mic file does not contain results (incomplete). How I will solve this problem?

It has been reported that the motional resistance of QCM is independent of the resonance frequency changes and is directly proportional to the viscoelastic property of the film deposited on the quartz crystal electrode.

As per the Saurbrey equation (applicable only to thin rigid films), resonance frequency change is negatively proportional to mass change.

I want to understand the physical significance as well as the difference between both motional resistance and resonance frequency of QCM and how they are independent of each other.

Thanks in advance!

Need to calculate diffusion layer thickness in three electrode cell for electrochemical capacitor.

While doing profile matching in full prof chi-square value is stuck at 12. When I try to refine u,v,w parameters their value reaches up to 38. What might be the possible reasons for the non-refinement of these parameters?

While performing the Electrochemical Impedance spectroscopy how we can choose the frequency range? It should be broad range or narrow?

Hello,

I am trying to make anode for Na-ion batteries. I have no experience with preparation of the electrolyte for any batteries. NaClO4 salt are available and I am planning to use EC:PC as solvent. I have confused that although NaClO4 has been reported with some safety problems in the literature, there are many studies including the electrolytes of NaClO4 salt. I also know NaPF6 is generally recommended one.

- Could you please anyone tell me what kind of safety issues NaClO4 has?

- Is there any danger during the preparation of the electrolyte in the glove box?

- Does anyone have any recommendation? (maybe giving a step by step procedure for making it - how and for how long do you dry the salt, how slowly do you add it, suppliers from which you get the salt/solvents) ?

I would really appreciate if you answer me. Thanks!

I have fabricated thin films and want to measure the impedance parallel to the material. I suspect the films are conducting protons and electrons based on some Hall effect measurements I have taken. I am a little confused in terms of the electrodes used for these measurements and what one might expect in terms of a Nyquist plot. I am using Pt wire as the WE and CE for one measurement and the clamps that came with our potentiostat (which I assume are stainless steel).

In the case of Pt electrodes; proton conductivity should be measured as long as there is sufficient water and and electrons will also move through the material. Therefore, it isn't blocking to anything, correct? I also do not see any Warburg impedance at this point which makes me wonder if protons are in fact mobile charges in this material. When I use the clamps then I should be blocking electrons and measuring the protons, right? If I just wanted to measure electrons and not ions what electrode material should I use (graphite?) or should I try to make the relative humidity 0% and have dry films?

Any advice on this matter would be appreciative. I apologize if this is confusing. Thank you!

Hello experts,

I am using MestReNova software for NMR data processing and plotting, but I am unable to find out an option by which I can show the integration and peak values in the stacked spectrum. stacked spectrum only showing peak, neither peaks values nor integration values. please help me out.