In:
Small, Wiley, Vol. 18, No. 6 ( 2022-02)
Kurzfassung:
The sluggish kinetics of sulfur conversion in the cathode and the nonuniform deposition of lithium metal at the anode result in severe capacity decay and poor cycle life for lithium–sulfur (Li–S) batteries. Resolving these deficiencies is the most direct route toward achieving practical cells of this chemistry. Herein, a vertically aligned wood–derived carbon plate decorated with Co 4 N nanoparticles host (Co 4 N/WCP) is proposed that can serve as a host for both the sulfur cathode and the metallic lithium anode. This Co 4 N/WCP electrode host drastically enhances the reaction kinetics in the sulfur cathode and homogenizes the electric field at the anode for the uniform lithium plating. Density functional theory calculations confirm the experimental observations that Co 4 N/WCP provides a lower energy barrier for the polysulfide redox reaction in the cathode and a low adsorption energy for lithium deposition at the anode. Employing the Co 4 N/WCP host at both electrodes in a S@Co 4 N/WCP||Li@Co 4 N/WCP full cell delivers a specific capacity of 807.9 mAh g −1 after 500 cycles at a 1 C rate. Additional experiments are performed with high areal sulfur loading of 4 mg cm −2 to demonstrate the viability of this strategy for producing practical Li–S cells.
Materialart:
Online-Ressource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.202105664
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2022
ZDB Id:
2168935-0