Conformal Conducting Polymer Shells on V2O5 Nanosheet Arrays as a High‐Rate and Stable Zinc‐Ion Battery Cathode. Issue 2 (25th November 2018)

• Record Type: Journal Article
• Authors: Xu, Dongming; Wang, Huanwen; Li, Fuyun; Guan, Zhecun; Wang, Rui; He, Beibei; Gong, Yansheng; Hu, Xianluo
• Is Part Of: Advanced materials interfaces. Volume 6:Issue 2(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-11-25
• Subjects: cathodes -- flexible -- nanosheet arrays -- PEDOT -- V2O5 -- zinc‐ion batteries; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.201801506
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Aqueous zinc‐ion batteries (ZIBs) have become research focus because of their cost‐effectiveness, high safety, and eco‐friendliness. Unfortunately, sluggish Zn 2+ diffusion kinetics and the poor cycling stability in cathode materials impede their large‐scale application. Herein, V2 O5 @poly(3, 4‐ethylenedioxythiophene) (PEDOT) hybrid nanosheet arrays are uniformly deposited on carbon cloth (CC) as a superior ZIB cathode. The as‐fabricated V2 O5 @PEDOT/CC electrode displays a maximum capacity of 360 mAh g −1 at 0.1 A g −1 . Meanwhile, this hybrid array electrode also shows high rate capability with a specific capacity of 232 mAh g −1 even at a large current density of 20 A g −1, and excellent cycling life (97% retention after 600 cycles at 1 A g −1 and 89% retention after 1000 cycles at 5 A g −1 ). The largely increased Zn‐storage performance of the V2 O5 @PEDOT nanosheet arrays results from the synergistic effects of the two components: the V2 O5 nanosheet arrays provide enough Zn‐storage active sites, while the PEDOT coating shell increases zinc ion/electron transport kinetics and further acts as a protective layer to restrain structural collapse during cycling. Abstract : Conformal coating of conducting poly(3, 4‐ethylenedioxythiophene) shells endows the V2 O5 cathode with much increased Zn‐storage performances, including high specific capacities (360 and 232 mAh g −1 at 0.1 and 20 A g −1, respectively) and long cycling life (89% retention after 1000 cycles at 5 A g −1 ).