Analysis of discrete spectra of electrochemical noise of lithium power sources

The Fourier, Daubechies, and Chebyshev transforms are used to analyze discrete spectra of electrochemical noise of lithium power sources under the open-circuit conditions. In the absence of trend of open-circuit voltage, all three approaches lead to similar estimates of intensity of discrete spectra of electrochemical noise of lithium power sources. A trend of open-circuit voltage has different effects on the Fourier, Daubechies, and Chebyshev spectra. The Fourier spectrum is most sensitive to a trend of open-circuit voltage; the Chebyshev spectrum is most resistant to the trend. The Daubechies spectrum occupies an intermediate position between the Fourier spectrum and the Chebyshev spectrum in the resistance to the trend of open-circuit voltage.