Hello !

I am trying to figure out how Dli (Lithium diffusion coefficient) is calculated. A method is from EIS measurement. Specifically, from the relationship between Warbung impedance and the inverse square root of angular frequency σ value can be extracted.

The equation is: D=0.5* (R*T)^2 / (A*n^2*F^2*c*σ)^2, where:

R is the gas constant (8.314 kg m^2 s^-2 K^-1 mol^-1)

T is the absolute temperature (298.15 K)

A is the working area of cathode (m^2)

n is the electronic transport ratio during redox process (1)

F is the Faraday constant (96485.33 A s mol^-1)

c is the molar density of li-ion in an electrode (1 mol/L) because I have 1M LiPF6 electrolyte solution

σ is the slope on the diffusion state of EIS measurement

Could you please inform me if the above values and this method are correct ??

Also, I am not sure if there is a need for converting the units because D is referred as cm^2 s^-1

Comments please !

Thank you very much for your time !

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