This talk will discuss properties of oxide-fluoride materials that make them attractive candidates for sodium ion batteries. Three issues of energy use concern i) energy storage, ii) expense of lithium sources, and iii) the open circuit voltage (OCV) of a battery. As solar, wind, hydropower, and other renewable energy sources are increasing, issue (i) must be addressed to store excess energy for use at a later time. This has been approached with the use of Li+ ion batteries. Issue (ii) compounds issue (i) as large Li+ batteries may be prohibitively expensive. Sodium ion batteries under investigation as a low-cost alternative to this, but issue (iii) complicates this as sodium ion batteries have lower OCVs (-0.2 to -0.5 V) as compared to lithium analogs owing to the lower diffusivity of the larger Na+ion within a cathode material.To address these issues, we present structural and electrochemical analyses of a new double-wolframite trimetallic compound: AgNa(VO2F2)2 or SSVOF; SSVOF is fully ordered and displays unique electrochemical characteristics. The compound contains trioxo vanadium fluoride octahedra which form one dimensional chains that are characteristic of wolframite (NaWO4). To approach issues (i) - (iii) we evaluated SSVOF within Li+ and Na+ batteries.1. Scrosati, B.; Selvaggi, A.; Croce, F.; Gang, W., Journal of Power Sources 1988,  24, 287-294.2. Selvaggi, A.; Croce, F.; Scrosati, B., Journal of Power Sources 1990,  32, 389-396.3. Goodenough, J. B.; Kim, Y., Chemistry of Materials 2009,  22, 587-603.4. Ong, S. P.; Chevrier, V. L.; Hautier, G.; Jain, A.; Moore, C.; Kim, S.; Ma, X.; Ceder, G., Energy & Environmental Science 2011,  4, 3680-3688.5. Doeff, M. M.; Shirpour, M.; Cabana, J., Meeting Abstracts 2012,  MA2012-02, 1831.

Electrochemical analyses and comparison of the double wolframite AgNa(VO2F2)2 in lithium and sodium ion batteries

246th National Meeting (2013)

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