Method of determining the impedance of an electrochemical...

Details Method of determining the impedance of an electrochemical... Method of determining the impedance of an electrochemical...

2007-08-07

2007-08-07

Easthom, Karl (Department: 2838)

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

C324S430000, C702S066000, C702S075000, C702S057000, C702S063000, C702S065000

Reexamination Certificate

active

10521216

ABSTRACT:
The invention relates to a method of determining the complex impedance Z(fm) of a non-steady electrochemical system, comprising the following steps consisting in: bringing the system to a selected voltage condition and applying a sinusoidal signal with frequency fmthereto; immediately thereafter, measuring successive values for voltage and current at regular time intervals ?T; calculating the discrete Fourier transforms for voltage (E(f)) and current (I(f)), the voltage transform being calculated for the single frequency fmof the sinusoidal signal and the current transform being calculated for frequency fmand for two adjacent frequencies fm−1and fm+1on either side of frequency fm; and calculating the impedance using the following formula: Z(fm)=E(fm)/I*(fm), wherein I* denotes a corrected current such that Re[I*(fm)]=Re[I*(fm)]−(Re[I(fm+1)]+Re[I(fm−1)]2, Im[I*(fm)]=Im[I(fm)]−Im[I(fm+1)]+Im[I(fm−1)])/2.

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