Elucidating the reaction kinetics of lithium-sulfur batteries by operando XRD based on an open-hollow S@MnO₂ cathode

verfasst von

Shaozhuan Huang, Lixiang Liu, Ye Wang, Yang Shang, Lin Zhang, Jiawei Wang, Yun Zheng, Oliver G. Schmidt, Hui Ying Yang

Abstract

Quantitatively elucidating the reaction kinetics of Li-sulfur (Li-S) batteries is always crucial in optimizing cathode structures but challenging as well. Herein, we study and compare the reaction mechanism and kinetics of Li-S batteries via operando X-ray diffraction (XRD) and quantitative analysis based on several cathode structures. Operando XRD indicates that β-S

₈ has different nucleation orientations on MnO

₂ and carbon surfaces due to the different surface free energies. The quantitative analysis reveals that polysulfides encapsulated in MnO

₂ nanosheets result in fast Li

₂S and β-S

₈ nucleation in the discharge and charge processes, respectively. It also shows that open-hollow S@MnO

₂ exhibits faster S consumption and higher sulfur utilization than the solid core-shell S@MnO

₂ and carbon black/S. Our work provides deep insight into the reaction mechanism and kinetics of Li-S batteries and indicates that the cathode structures and host materials play critical roles in enhancing the reaction kinetics.

Externe Organisation(en)

Singapore University of Technology and Design
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW) e.V.
Nanyang Technological University (NTU)
Technische Universität Chemnitz

Typ

Artikel

Journal

Journal of Materials Chemistry A

Band

7

Seiten

6651-6658

Anzahl der Seiten

8

ISSN

2050-7488

Publikationsdatum

28.03.2019

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Chemie, Erneuerbare Energien, Nachhaltigkeit und Umwelt, Allgemeine Materialwissenschaften

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1039/c9ta00199a (Zugang: Geschlossen)