An electrochemical cell, based on a specifically designed substrate, was used to monitor in an in situ manner the conductivity variations of various thin film electrode materials, grown by laser ablation, during their electrochemical reaction vs Li + /Li 0 . The validity of such a new setup was first demonstrated for the well-known Li x CoO 2 insertion electrode and further extended to an Fe 2 O 3 electrode that reacts with Li through a conversion as opposed to an insertion process. For Li x CoO 2, a drastic increase in the conductivity near the solid solution domain was observed, confirming the insulator/metal transition previously observed near x = 0.9. For the transport properties of α-Fe 2 O 3 thin films as a function of their Li uptake and removal, we noted the semi-metal-like behavior of the Li 2 O/M matrix, with room-temperature conductivity values ranging from 1 to 25 S/cm. Such results are in favor of mass transport limitations to explain high polarization observed for conversion reactions.
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Sauvage et al. (2007) studied this question.
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