Bottom-up Approach toward Single-Crystalline VO2-Graphene Ribbons as Cathodes for Ultrafast Lithium Storage

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• 作者：Shubin Yang ; Yongji Gong ; Zheng Liu ; Liang Zhan ; Daniel P. Hashim ; Lulu Ma ; Robert Vajtai ; Pulickel M. Ajayan
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：April 10, 2013
• 年：2013
• 卷：13
• 期：4
• 页码：1596-1601
• 全文大小：460K
• 年卷期：v.13,no.4(April 10, 2013)
• ISSN：1530-6992

文摘

Although lithium ion batteries have gained commercial success owing to their high energy density, they lack suitable electrodes capable of rapid charging and discharging to enable a high power density critical for broad applications. Here, we demonstrate a simple bottom-up approach toward single crystalline vanadium oxide (VO₂) ribbons with graphene layers. The unique structure of VO₂-graphene ribbons thus provides the right combination of electrode properties and could enable the design of high-power lithium ion batteries. As a consequence, a high reversible capacity and ultrafast charging and discharging capability is achieved with these ribbons as cathodes for lithium storage. A full charge or discharge is capable in 20 s. More remarkably, the resulting electrodes retain more than 90% of the initial capacity after cycling more than 1000 times at an ultrahigh rate of 190C, providing the best reported rate performance for cathodes in lithium ion batteries to date.

Keywords:

Nanoribbons; graphene; ultrafast; electrode; lithium ion batteries