11December2019

Nano-Micro Letters

All Binder-Free Electrodes for High-Performance Wearable Aqueous Rechargeable Sodium-Ion Batteries

Bing He1,3,4, Ping Man1,3, Qichong Zhang5, Huili Fu1,3, Zhenyu Zhou1,3, Chaowei Li1,3, Qiulong Li1,2, Lei Wei5, Yagang Yao1,2,4,*

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Nano-Micro Lett. (2019) 11: 101

First Online: 20 November 2019 (Article)

DOI:10.1007/s40820-019-0332-7

*Corresponding author. E-mail: ygyao2018@nju.edu.cn (Yagang Yao)

 

Abstract

 


Toc

Extensive efforts have recently been devoted to the construction of aqueous rechargeable sodium-ion batteries (ARSIBs) for large-scale energy-storage applications due to their desired properties of abundant sodium resources and inherently safer aqueous electrolytes. However, it is still a significant challenge to develop highly flexible ARSIBs ascribing to the lack of flexible electrode materials. In this work, nanocube-like KNiFe(CN)6 (KNHCF) and rugby ball-like NaTi2(PO4)3 (NTP) are grown on carbon nanotube fibers via simple and mild methods as the flexible binder-free cathode (KNHCF@CNTF) and anode (NTP@CNTF), respectively. Taking advantage of their high conductivity, fast charge transport paths, and large accessible surface area, the as-fabricated binder-free electrodes display admirable electrochemical performance. Inspired by the remarkable flexibility of the binder-free electrodes and the synergy of KNHCF@CNTF and NTP@CNTF, a high-performance quasi-solid-state fiber-shaped ARSIB (FARSIB) is successfully assembled for the first time. Significantly, the as-assembled FARSIB possesses a high capacity of 34.21 mAh cm−3 and impressive energy density of 39.32 mWh cm−3. More encouragingly, our FARSIB delivers superior mechanical flexibility with only 5.7% of initial capacity loss after bending at 90° for over 3000 cycles. Thus, this work opens up an avenue to design ultraflexible ARSIBs based on all binder-free electrodes for powering wearable and portable electronics.


 

Keywords

Carbon nanotube fiber; Binder-free electrode; Flexibility; Aqueous rechargeable energy-storage device; Sodium-ion battery

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