Polarization resistance galvanostatic technique

Figure 7-6. Impedance of pure iron in 0.5 M H2SO4 sdlution without (-0-) and with 100 mM triphenylbencylphosphonium-chloride as inhibitor (-X-) For comparison, values of the polarization resistance Rp derived from other measurement techniques are Rj cyclic voltammet-ric, /fpi galvanostatic, and Rp po-tentiostatic polarization curves, and solution analysis by atomic absorption (AA) (Jiittner et al., 1985).

As mentioned earlier, electrolytes used in lithium batteries are usually concentrated, binary electrolytes that exhibit nonideal behavior. In addition, polymer and gel electrolytes are opaque, highly resistive, and sticky, and therefore their transference numbers are not easily measurable using traditional techniques such as the Hittorf or moving boundary methods. Recent theoretical studies have described the substantial error involved in measuring transference numbers with techniques that assume ideal behavior [14, 15], and have described how experimental data can be interpreted rigorously using concentrated-solution theory to obtain transference numbers. One method is the galvanostatic polarization technique [120,121,122] ... 

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