Room-Temperature Synthesis Leading to Nanocrystalline Ag<sub>2</sub>V<sub>4</sub>O<sub>11</sub>
Frédéric Sauvage (1471729)Vincent Bodenez (2298172)Jean-Marie Tarascon (1377048)Kenneth R. Poeppelmeier (1351275)
Abstract
This work highlights a room-temperature composition study of the Ag<sub>2</sub>O/V<sub>2</sub>O<sub>5</sub>/HF<sub>(aq)</sub> ternary system, leading to the precipitation of either various silver vanadates having Ag/V ratios from 1/2 to 3/1 or the new silver vanadium oxyfluoride compounds Ag<sub>4</sub>V<sub>2</sub>O<sub>6</sub>F<sub>2</sub> and Ag<sub>3</sub>VO<sub>2</sub>F<sub>4</sub>, and a synthetic procedure that affords nanocrystalline Ag<sub>2</sub>V<sub>4</sub>O<sub>11</sub> (SVO) at room temperature. The as-precipitated SVO particles exhibit an acicular morphology, 10−15 × 50−200 nm in size, and present a peculiar reactivity vs lithium notably through a Ag<sup>+</sup>/Li<sup>+</sup> displacement reaction that progresses in a reversible fashion. This step forward thus enables the reversible and simultaneous combination of two active redox processes (silver and vanadium), providing a significant enhancement in the cathode gravimetric capacity of 320 mAh/g at C rate and more than 250 mAh/g at 5C.
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