Journal
NANO LETTERS
Volume 13, Issue 4, Pages 1596-1601Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl400001u
Keywords
Nanoribbons; graphene; ultrafast; electrode; lithium ion batteries
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Funding
- U.S. Army Research Office through a MURI grant on Novel Free-Standing 2D Crystalline Materials focusing on Atomic Layers of Nitrides, Oxides, and Sulfides [W911NF-11-1-0362]
- NSF [0940902]
- U.S. Office of Naval Research MURI grant [N000014-09-1-1066]
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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.
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