2D Amorphous V2O5/Graphene Heterostructures for High‐Safety Aqueous Zn‐Ion Batteries with Unprecedented Capacity and Ultrahigh Rate Capability. Issue 22 (6th April 2020)

• Record Type: Journal Article
• Authors: Wang, Xiao; Li, Yaguang; Wang, Sen; Zhou, Feng; Das, Pratteek; Sun, Chenglin; Zheng, Shuanghao; Wu, Zhong‐Shuai
• Is Part Of: Advanced energy materials. Volume 10:Issue 22(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-04-06
• Subjects: 2D heterostructures -- V2O5/graphene -- zinc ion batteries; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202000081
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Rechargeable aqueous zinc‐ion batteries (ZIBs) are appealing due to their high safety, zinc abundance, and low cost. However, developing suitable cathode materials remains a great challenge. Herein, a novel 2D heterostructure of ultrathin amorphous vanadium pentoxide uniformly grown on graphene (A‐V2 O5 /G) with a very short ion diffusion pathway, abundant active sites, high electrical conductivity, and exceptional structural stability, is demonstrated for highly reversible aqueous ZIBs (A‐V2 O5 /G‐ZIBs), coupling with unprecedented high capacity, rate capability, long‐term cyclability, and excellent safety. As a result, 2D A‐V2 O5 /G heterostructures for stacked ZIBs at 0.1 A g −1 display an ultrahigh capacity of 489 mAh g −1, outperforming all reported ZIBs, with an admirable rate capability of 123 mAh g −1 even at 70 A g −1 . Furthermore, the new‐concept prototype planar miniaturized zinc‐ion microbatteries (A‐V2 O5 /G‐ZIMBs), demonstrate a high volumetric capacity of 20 mAh cm −3 at 1 mA cm −2, long cyclability; holding high capacity retention of 80% after 3500 cycles, and in‐series integration, demonstrative of great potential for highly‐safe microsized power sources. Therefore, the exploration of such 2D heterostructure materials with strong synergy is a reliable strategy for developing safe and high‐performance energy storage devices. Abstract : 2D amorphous V2 O5 /graphene heterostructures are demonstrated for highly‐safe aqueous zinc ion batteries. Notably, the stacked zinc ion batteries exhibit unprecedented capacity of 489 mAh g −1 and exceptional rate capability with a capacity of 123 mAh g −1 even at 70 A g −1, while the planar zinc ion batteries display high volumetric capacity, long‐term cyclability, remarkable flexibility, and integration.