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

Abstract

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.

A Porous Nano-Micro-Composite as a High-Performance Bi-Functional Air Electrode with Remarkable Stability for Rechargeable Zinc–Air Batteries

“…Regardless of these benefits, these energies are intermittent; thereby, it is crucial to locate some viable energy storage devices. In this context, rechargeable batteries are considered as a source of storing harvested energy from the given resources [3,4].…”

Crystalline Co2V3O8@Amorphous Co−B Core‐Shell Nano‐Microsphere: Tunable Shell Layer Thickness, Faradaic Pseudocapacitive Mechanism, and Electrochemical Capacitor Applications

“…The comparison of the specific capacitances and retention rate of Co 3 V 2 O 8 @Co−B‐2 with other reported cobalt‐based compounds have been added in Table 1. Besides, the electrochemical process kinetics of the electrodes are analyzed according to electrochemical impedance spectroscopy (EIS) and Bode plots [48] . Co 3 V 2 O 8 @Co−B‐2 electrode material exhibits maximum slope and smallest semicircle compared with others, revealing a fast diffusion rate of electrons and great conductivity.…”

Drive towards Sonochemically Synthesized Ternary Metal Sulfide for High‐Energy Supercapattery

“…[4,5] RBs store energy through Faradaic redox reactions that take place between the electrode material and electrolyte ions. For their charge storage mechanisms the RBs are attributed with highenergy characteristics [6,7] and they endorse multiple applications in electric vehicles, tablets, mobiles phones, and various electronic devices. The presence of the redox reaction also imparts characteristics such as low specific power and deteriorating cyclic life that hinder their worth.…”