CORROSION RESEARCH CENTER Sensors and Batteries

In order to enhance the rate capabilities of the host we increased the electronic conductivity by doping the vanadium oxide xerogels with silver. We were able to prepare silver-doped vanadium pentoxides with a molar ratio (Ag/V) ranging from 0.005 to 0.5.

With intermediate doping levels, 0.1 mole of silver per mole of V₂O₅, the conductivity was enhanced by a factor of 80 without any significant change in the host layered structure.

The electrochemical performance of the silver doped material Ag0.1V₂O₅ (XRG) is very high, up to 4 moles of lithium per mole of silver-doped V₂O₅ were found to be reversibly intercalated. In addition, the lithium diffusion coefficient is found to be higher in the doped material with a smaller dependence on the lithium intercalation level, and this resulted in higher rates of insertion.

Although the work is mainly focused on dip-coated thin films because of their ease of preparation, it has been shown that the enhanced performance of the thin films was maintained when powders of the bulk material were used to form thick composite pellet electrodes.

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