Format

Send to

Choose Destination
Angew Chem Int Ed Engl. 2019 Mar 18;58(12):3779-3783. doi: 10.1002/anie.201812062. Epub 2019 Jan 16.

Activating Inert Metallic Compounds for High-Rate Lithium-Sulfur Batteries Through In Situ Etching of Extrinsic Metal.

Author information

1
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China.
2
Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081, P. R. China.
3
Department of Chemical Engineering, Tsinghua University, Beijing, 100084, P. R. China.

Abstract

Surface reactions constitute the foundation of various energy conversion/storage technologies, such as the lithium-sulfur (Li-S) batteries. To expedite surface reactions for high-rate battery applications demands in-depth understanding of reaction kinetics and rational catalyst design. Now an in situ extrinsic-metal etching strategy is used to activate an inert monometal nitride of hexagonal Ni3 N through iron-incorporated cubic Ni3 FeN. In situ etched Ni3 FeN regulates polysulfide-involving surface reactions at high rates. Electron microscopy was used to unveil the mechanism of in situ catalyst transformation. The Li-S batteries modified with Ni3 FeN exhibited superb rate capability, remarkable cycling stability at a high sulfur loading of 4.8 mg cm-2 , and lean-electrolyte operability. This work opens up the exploration of multimetallic alloys and compounds as kinetic regulators for high-rate Li-S batteries and also elucidates catalytic surface reactions and the role of defect chemistry.

KEYWORDS:

electrocatalysis; lithium-sulfur batteries; metal nitrides; polysulfide redox reaction; separators

PMID:
30548388
DOI:
10.1002/anie.201812062

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center