Abstract
Composite V 6O 13 electrodes were characterized in cells having metallic lithium counter and reference electrodes. The overall impedance changes closely follow the variation of the V 6O 13 unit cell volume. An abrupt change in unit cell volume if reflected in a corresponding abrupt change in the interfacial impedance. The variation of the interface impedance implies that the integrity of the electrode structure changes during the lithium insertion and extraction processes.
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