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

Chuan Xia (1) , Zifeng Lin (2, 3) , Yungang Zhou (4) , Chao Zhao (1) , Hanfeng Liang (1) , Patrick Rozier (2, 3) , Zhiguo Wang (4) , Husam N. Alshareef (1)

1 KAUST - King Abdullah University of Science and Technology [Saudi Arabia]
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 RS2E - Réseau sur le stockage électrochimique de l'énergie
4 UESTC - University of Electronic Science and Technology of China [Chengdu]

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.

Mots clés: 2D; Intercalation; Kinetic barrier; Pseudocapacitance; Ultrathin

Domaines: Matériaux; Energie électrique

Chuan Xia, Zifeng Lin, Yungang Zhou, Chao Zhao, Hanfeng Liang, et al.. Large Intercalation Pseudocapacitance in 2D VO2(B): Breaking through the Kinetic Barrier. Advanced Materials, 2018, 30 (40), pp.1803594. ⟨10.1002/adma.201803594⟩. ⟨hal-02351758⟩