Analysis of electrochemical noise in NiCd batteries throughout their lifetime

Abstract

Electrochemical noise measurements have been applied to electrochemical systems that show stochastic behavior. The standard area of study that benefits from this stochastic analysis is localized corrosion modes like pitting and crevice corrosion. Application of electrochemical noise measurements to battery systems, though rare, is recently becoming more popular. The present contribution first establishes a method of analyzing electrochemical voltage noise data for NiCd batteries, then follows four samples of batteries in terms of voltage noise throughout their lifetimes. The noises exhibited by battery systems are small, but finite. This noise is expected to be due to variations in the electrochemistry on the electrode surfaces of the battery. After careful analysis, the voltage noise behavior of NiCd batteries does not appear to show a statistically significant variation of electrochemical voltage noise throughout their lifetimes.