Molten Salt Electrochemical Modulation of Iron–Carbon–Nitrogen for Lithium–Sulfur Batteries

Sulfur hosts with rationally designed chemistry to confine and convert lithium polysulfides are of prime importance for high‐performance lithium–sulfur batteries. A molten salt electrochemical modulation of iron–carbon–nitrogen is herein demonstrated as formation of hollow nitrogen‐doped carbon with...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-11, Vol.60 (47), p.24905-24909
Main Authors: Weng, Wei, Xiao, Juanxiu, Shen, Yijun, Liang, Xinxin, Lv, Teng, Xiao, Wei
Format: Article
Language:English
Subjects:
Adsorption
Carbon
Catalytic converters
Cementite
Conversion
Electrochemistry
Electrolysis
Fe3C
hollow structure
Iron
Iron carbides
Lithium
Lithium sulfur batteries
Metal carbides
Modulation
molten salt electrolysis
Molten salts
Nanoparticles
Nitrogen
Polysulfides
Salts
Sulfur
sulfur host
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Summary:Sulfur hosts with rationally designed chemistry to confine and convert lithium polysulfides are of prime importance for high‐performance lithium–sulfur batteries. A molten salt electrochemical modulation of iron–carbon–nitrogen is herein demonstrated as formation of hollow nitrogen‐doped carbon with grafted Fe3C nanoparticles (Fe3C@C@Fe3C), which is rationalized as an excellent sulfur host for lithium‐sulfur batteries. Fe3C over nitrogen‐doped carbon contributes to enhanced adsorption and catalytic conversion of lithium polysulfides. The sulfur‐loaded Fe3C@C@Fe3C electrodes hence show a high capacity, good cyclic stability, and enhanced rate performance. This work highlights the unique chemistry of metal carbides on facilitating adsorption–conversion process of lithium polysulfides, and also extends the scope of molten salt electrolysis to elaboration of energy materials. Iron–carbon–nitrogen consisting of hollow nitrogen‐doped carbon with highly grafted Fe3C nanoparticles is an excellent sulfur host for lithium–sulfur batteries owing to the facilitated adsorption–conversion process of lithium polysulfides.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202111707