Details

Autor(en) / Beteiligte

• Zheng, Chen
• Huang, Zi‐Hang
• Sun, Fang‐Fang
• Zhang, Yue
• Li, Hui
• Liu, Yong
• Ma, Tianyi

Titel

Oxygen‐Vacancy‐Reinforced Vanadium Oxide/Graphene Heterojunction for Accelerated Zinc Storage with Long Life Span

Ist Teil von

• Small (Weinheim an der Bergstrasse, Germany), 2024-02, Vol.20 (6), p.e2306275-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Vanadium trioxide (V6O13) cathode has recently aroused intensive interest for aqueous zinc‐ion batteries (AZIBs) due to their structural and electrochemical diversities. However, it undergoes sluggish reaction kinetics and significant capacity decay during prolonged cycling. Herein, an oxygen‐vacancy‐reinforced heterojunction in V6O13−x/reduced graphene oxide (rGO) cathode is designed through electrostatic assembly and annealing strategy. The abundant oxygen vacancies existing in V6O13−x weaken the electrostatic attraction with the inserted Zn2+; the external electric field constructed by the heterointerfaces between V6O13−x and rGO provides additional built‐in driving force for Zn2+ migration; the oxygen‐vacancy‐enriched V6O13−x highly dispersed on rGO fabricates the interconnected conductive network, which achieves rapid Zn2+ migration from heterointerfaces to lattice. Consequently, the obtained 2D heterostructure exhibits a remarkable capacity of 424.5 mAh g−1 at 0.1 A g−1, and a stable capacity retention (96% after 5800 cycles) at the fast discharge rate of 10 A g−1. Besides, a flexible pouch‐type AZIB with real‐life practicability is fabricated, which can successfully power commercial products, and maintain stable zinc‐ion storage performances even under bending, heavy strikes, and pressure condition. A series of quantitative investigation of pouch batteries demonstrates the possibility of pushing pouch‐type AZIBs to realistic energy storage market. The oxygen‐vacancy‐reinforced V6O13−x/reduced graphene oxide heterojunction cathode with interconnected conductive network demonstrates the superior rate capability and cycling stability for aqueous zinc‐ion batteries (AZIBs). Significantly, the encapsulated flexible pouch‐type AZIBs can effectively power for the tablet, confirming the vast commercialization potential.