MOF-Derived Bifunctional Co_0.85Se Nanoparticles Embedded in N-Doped Carbon Nanosheet Arrays as Efficient Sulfur Hosts for Lithium–Sulfur Batteries

Abstract

Lithium–sulfur batteries possess the merits of low cost and high theoretical energy density but suffer from the shuttle effect of lithium polysulfides and slow redox kinetics of sulfur. Herein, novel Co0.85Se nanoparticles embedded in nitrogen-doped carbon nanosheet arrays (Co0.85Se/NC) were constructed on carbon cloth as the self-supported host for a sulfur cathode using a facile fabrication strategy. The interconnected porous carbon-based structure of the Co0.85Se/NC could facilitate the rapid electron and ion transfer kinetics. The embedded Co0.85Se nanoparticles can effectively capture and catalyze lithium polysulfides, thus accelerating the redox kinetics and stabilizing sulfur cathodes. Therefore, the Co0.85Se/NC-S cathode could maintain a stable cycle performance for 400 cycles at 1C and deliver a high discharge specific capacity of 1361, 1001, and 810 mAh g–1 at current densities of 0.1, 1, and 3C, respectively. This work provides an efficient design strategy for high-performance lithium–sulfur batteries with high energy densities.

Process of metal–organic framework (MOF)/covalent–organic framework (COF) hybrids-based derivatives and their applications on energy transfer and storage

“…This change in the nanostructure and crystal structure for MOFs or COFs by annealing can provide improved electron transfer between metal centers and organic linkers, widening their applications in many fields relevant to clean energy and energy storage. 176…”

Achieving Uniform Li Plating/Stripping at Ultrahigh Currents and Capacities by Optimizing 3D Nucleation Sites and Li2Se‐Enriched SEI

“…In recent decades, investigations into high‐energy‐density secondary batteries have continued to increase to satisfy the increasing demand for electric vehicles, mobile devices, and flexible electronics. [ 1 , 2 , 3 , 4 ] Lithium‐ion batteries (LIBs) are ideal candidates owing to their long lifespans and high safety. [ 5 , 6 ] However, the development of high‐energy‐density LIBs is limited significantly by the low theoretical capacity of graphite‐based anodes (372 mAh g –1 ).…”

3D Architecturing Strategy on the Utmost Carbon Nanotube Fiber for Ultra‐High Performance Fiber‐Shaped Supercapacitor

“…With the increasing demand for wearable intelligent devices in the modern flexible electronics market within the last couple of years, numerous researchers have focused on quasi‐1D fiber‐shaped supercapacitors (FSSCs) with the following characteristics: small volume, light weight, high performance, and durability from frequent distortion during use. [ 1–9 ] However, despite these numerous merits and academic research accomplishments, several key technical problems/challenges, including their electrochemical performance, mechanical flexibility, and cycling performance under various kinds of deformations, have not yet been resolved. [ 3,10,11 ] To faithfully translate laboratory‐level FSSCs into practical applications, the above issues must be addressed simultaneously.…”

“…durability from frequent distortion during use. [1][2][3][4][5][6][7][8][9] However, despite these numerous merits and academic research accomplishments, several key technical problems/ challenges, including their electrochemical performance, mechanical flexibility, and cycling performance under various kinds of deformations, have not yet been resolved. [3,10,11] To faithfully translate laboratory-level FSSCs into practical applications, the above issues must be addressed simultaneously.…”