Room-Temperature Synthesis Leading to Nanocrystalline Ag2V4O11

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• 作者：Frdric Sauvage ; Vincent Bodenez ; Jean-Marie Tarascon ; Kenneth R. Poeppelmeier
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：May 19, 2010
• 年：2010
• 卷：132
• 期：19
• 页码：6778-6782
• 全文大小：265K
• 年卷期：v.132,no.19(May 19, 2010)
• ISSN：1520-5126

文摘

This work highlights a room-temperature composition study of the Ag₂O/V₂O₅/HF_(aq) 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 Ag₄V₂O₆F₂ and Ag₃VO₂F₄, and a synthetic procedure that affords nanocrystalline Ag₂V₄O₁₁ (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⁺/Li⁺ 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.