CHEMISTRY: Cathode Fluoridation

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Science  22 Apr 2005:
Vol. 308, Issue 5721, pp. 468c
DOI: 10.1126/science.308.5721.468c

One highly demanding application of lithium batteries is that of charging the capacitors of implantable cardioverter defibrillators. Recharging of the capacitors that deliver the shock to the heart requires batteries that can deliver high voltage and power quickly. For this application, silver vanadium oxide (SVO, Ag2V4O11) has been a cathode of choice, but there is interest in increasing the capacity that can be delivered above 3 V, which is that portion associated with silver reduction (the rest is associated with V5+/V4+ and V4+/V3+ couples). Sorensen et al. incorporated fluoride into these materials through a low-temperature (150°C) hydrothermal synthesis that yielded Ag4V2O6F2, which increased the silver content of the material without sacrificing the framework structure that allows facile lithium and silver diffusion. This material has about 50% higher capacity above 3 V than does SVO, and because of the fluoride incorporation, delivers it at a potential that is 0.3 V higher. — PDS

J. Am. Chem. Soc. 10.1021/ja050150f (2005).

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