Electrochemical Synthesis of a Lithium-Rich Rock-Salt-Type Oxide Li5W2O7 with Reversible Deintercalation Properties

详细信息    查看全文

• 作者：Valerie Pralong ; Gopal Venkatesh ; Sylvie Malo ; Vincent Caignaert ; Radu Baies ; Bernard Raveau
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：January 6, 2014
• 年：2014
• 卷：53
• 期：1
• 页码：522-527
• 全文大小：443K
• ISSN：1520-510X

文摘

Starting from the ribbon structure Li₂W₂O₇, the lithium-rich phase Li₅W₂O₇ with an ordered rock-salt-type structure has been synthesized, through a topotactic irreversible reaction, using both electrochemistry and soft chemistry. In contrast to Li₂W₂O₇, the lithium-rich oxide Li₅W₂O₇ shows reversible deintercalation properties of two lithium molecules per formula unit: a stable reversible capacity of 110 mAh/g at 1.70 V is maintained after 10 cycles. The exploration of the lithium mobility in this system shows that Li₂W₂O₇ is a cationic conductor with 蟽 = 4.10^鈥? S/cm at 400 掳C and E_a = 0.5 eV.