Large Intercalation Pseudocapacitance in 2D VO2 (B): Breaking through the Kinetic Barrier

Advanced Materials
Chuan XiaHusam N Alshareef

Abstract

VO2 (B) features two lithiation/delithiation processes, one of which is kinetically facile and has been commonly observed at 2.5 V versus Li/Li+ in various VO2 (B) structures. In contrast, the other process, which occurs at 2.1 V versus Li/Li+ , has only been observed at elevated temperatures due to large interaction energy barrier and extremely sluggish kinetics. Here, it is demonstrated that a rational design of atomically thin, 2D nanostructures of VO2 (B) greatly lowers the interaction energy and Li+ -diffusion barrier. Consequently, the kinetically sluggish step is successfully enabled to proceed at room temperature for the first time ever. The atomically thin 2D VO2 (B) exhibits fast charge storage kinetics and enables fully reversible uptake and removal of Li ions from VO2 (B) lattice without a phase change, resulting in exceptionally high performance. This work presents an effective strategy to speed up intrinsically sluggish processes in non-van der Waals layered materials.

References

Oct 29, 2008·Nature Materials·Patrice Simon, Yury Gogotsi
Nov 19, 2011·Science·Bruce DunnJean-Marie Tarascon
Mar 15, 2013·ACS Applied Materials & Interfaces·C NethravathiYoshio Bando
Apr 16, 2013·Nature Materials·Veronica AugustynBruce Dunn
Apr 25, 2013·Nano Letters·Georgios A TritsarisEnge Wang
Sep 8, 2016·Nature Communications·Maria R LukatskayaYury Gogotsi
Dec 6, 2016·Nature Materials·Hyung-Seok KimBruce Dunn
Mar 8, 2017·Nano Letters·Shinbuhm LeeHo Nyung Lee

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