Nanostructured Bilayered Vanadium Oxide Electrodes for Rechargeable Sodium-Ion Batteries

详细信息    查看全文

• 作者：Sanja Tepavcevic ; Hui Xiong ; Vojislav R. Stamenkovic ; Xiaobing Zuo ; Mahalingam Balasubramanian ; Vitali B. Prakapenka ; Christopher S. Johnson ; Tijana Rajh
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：January 24, 2012
• 年：2012
• 卷：6
• 期：1
• 页码：530-538
• 全文大小：581K
• 年卷期：v.6,no.1(January 24, 2012)
• ISSN：1936-086X

文摘

Tailoring nanoarchitecture of materials offers unprecedented opportunities in utilization of their functional properties. Nanostructures of vanadium oxide, synthesized by electrochemical deposition, are studied as a cathode material for rechargeable Na-ion batteries. Ex situ and in situ synchrotron characterizations revealed the presence of an electrochemically responsive bilayered structure with adjustable intralayer spacing that accommodates intercalation of Na⁺ ions. Sodium intake induces organization of overall structure with appearance of both long- and short-range order, while deintercalation is accompanied with the loss of long-range order, whereas short-range order is preserved. Nanostructured electrodes achieve theoretical reversible capacity for Nab>2b>Vb>2b>Ob>5b> stochiometry of 250 mAh/g. The stability evaluation during charge鈥揹ischarge cycles at room temperature revealed an efficient 3 V cathode material with superb performance: energy density of 760 Wh/kg and power density of 1200 W/kg. These results demonstrate feasibility of development of the ambient temperature Na-ion rechargeable batteries by employment of electrodes with tailored nanoarchitectures.<br>

Keywords:

nanostructured electrodes; electrochemical deposition; bilayered Vb>2b>Ob>5b>; sodium-ion battery