title: Ag4V2O6F2: an electrochemically active and high silver density phase.
abstract: Low-temperature hydrothermal techniques were used to synthesize single crystals of Ag(4)V(2)O(6)F(2). This previously unreported oxide fluoride phase was characterized by single-crystal X-ray diffraction and IR spectroscopy and was also evaluated as a primary lithium battery cathode. Crystal data: monoclinic, space group P2(1)/n (No. 14), with a = 8.4034(4) A, b = 10.548(1) A, c = 12.459(1) A, beta = 90.314(2) degrees , and Z = 4. Ag(4)V(2)O(6)F(2) (SVOF) exhibits two characteristic regions within the discharge curve, an upper plateau at 3.5 V, and a lower sloped region around 2.3 V from reduction of the vanadium oxide fluoride framework. The material has a nominal capacity of 251 mAh/g, with 148 mAh/g above 3 V. The upper discharge plateau at 3.5 V is nearly 300 mV over the silver reduction potential of the commercial primary battery material, Ag(2)V(4)O(11) (SVO).
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.
authors.forename: Erin M
authors.initials: EM
authors.lastname: Sorensen
authors.forename: Heather K
authors.initials: HK
authors.lastname: Izumi
authors.forename: John T
authors.initials: JT
authors.lastname: Vaughey
authors.forename: Charlotte L
authors.initials: CL
authors.lastname: Stern
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Poeppelmeier