Manipulating Hierarchical Orientation of Wet‐Spun Hybrid Fibers via Rheological Engineering for Zn‐Ion Fiber Batteries. Issue 33 (17th July 2022)

• Record Type: Journal Article
• Authors: Xia, Zhou; Li, Shuo; Wu, Guiqing; Shao, Yanyan; Yang, Dongzi; Luo, Jinrong; Jiao, Zhenyang; Sun, Jingyu; Shao, Yuanlong
• Is Part Of: Advanced materials. Volume 34:Issue 33(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-17
• Subjects: fiber batteries -- rheological engineering -- wet‐spinning -- Zn‐ion batteries; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202203905
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Wet‐spinning is a promising strategy to fabricate fiber electrodes for real commercial fiber battery applications, according to its great compatibility with large‐scale fiber production. However, engineering the rheological properties of the electrochemical active materials to accommodate the viscoelasticity or liquid crystalline requirements for continuous wet‐spinning remains a daunting challenge. Here, with entropy‐driven volume‐exclusion effects, the rheological behavior of vanadium pentoxide (V2 O5 ) nanowire dispersions is regulated through introducing 2D graphene oxide (GO) flakes in an optimal ratio. By optimizing the viscoelasticity and liquid‐crystalline behavior of the spinning dope, the wet‐spun hybrid fibers display controlled hierarchical orientation. The wet‐spun V2 O5 /rGO hybrid fiber with the optimal 10:1 mass fraction (V2 O5 /rGO10:1 ) exhibits a highly oriented nanoblock arrangement, enabling efficient Zn‐ion migration and an excellent Zn‐ion storage capacity of 486.03 mAh g −1 at 0.1 A g −1 . A half‐meter long quasi‐solid‐state fiber Zn‐ion battery is assembled with a polyacrylamide gel electrolyte and biocompatible Ecoflex encapsulation. The thus‐derived fiber Zn‐ion battery is integrated into a wearable self‐powered system, incorporating a highly efficient GaAs solar cell, which delivers a record‐high overall efficiency (9.80%) for flexible solar charging systems. Abstract : With entropy‐driven volume‐exclusion effects, the rheological behavior of vanadium pentoxide (V2 O5 ) nanowire dispersions is regulated through the introduction of graphene oxide (GO) flakes. A quasi‐solid‐state fiber Zn‐ion battery is assembled to integrate into a wearable self‐powered system, incorporating a GaAs solar cell to deliver a high overall efficiency (9.80%).