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The depth of discharge of lithium-thionyl chloride batteries is estimated from their impedance characteristics. It is shown that, in principle, it can be determined when using as an informative parameter indicating the phase value at the extreme point in impedance spectra of lithium batteries.

Impedance spectroscopy was used to study the initial stages of lithium anode dissolution in SAFT LS-33600 cells at frequencies more than 35 Hz. It was found that experimental results can be described by the dissolution of metals covered by a passive film, including the stages of film dilatation and breakdown of the film.

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