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Binary Sulfiphilic Nickel Boride on Boron-Doped Graphene with Beneficial Interfacial Charge for Accelerated Li-S Dynamics.

Authors :
Wang Y
Wang P
Yuan J
Song N
An X
Ma X
Feng J
Xi B
Xiong S
Source :
Small (Weinheim an der Bergstrasse, Germany) [Small] 2023 Jul; Vol. 19 (29), pp. e2208281. Date of Electronic Publication: 2023 Apr 07.
Publication Year :
2023

Abstract

The "shuttle effect" and slow conversion kinetics of lithium polysulfides (LiPSs) are stumbling block for high-energy-density lithium-sulfur batteries (LSBs), which can be effectively evaded by advanced catalytic materials. Transition metal borides possess binary LiPSs interactions sites, aggrandizing the density of chemical anchoring sites. Herein, a novel core-shelled heterostructure consisting of nickel boride nanoparticles on boron-doped graphene (Ni <subscript>3</subscript> B/BG), is synthesized through a graphene spontaneously couple derived spatially confined strategy. The integration of Li <subscript>2</subscript> S precipitation/dissociation experiments and density functional theory computations demonstrate that the favorable interfacial charge state between Ni <subscript>3</subscript> B and BG provides smooth electron/charge transport channel, which promotes the charge transfer between Li <subscript>2</subscript> S <subscript>4</subscript> -Ni <subscript>3</subscript> B/BG and Li <subscript>2</subscript> S-Ni <subscript>3</subscript> B/BG systems. Benefitting from these, the facilitated solid-liquid conversion kinetics of LiPSs and reduced energy barrier of Li <subscript>2</subscript> S decomposition are achieved. Consequently, the LSBs employed the Ni <subscript>3</subscript> B/BG modified PP separator deliver conspicuously improved electrochemical performances with excellent cycling stability (decay of 0.07% per cycle for 600 cycles at 2 C) and remarkable rate capability of 650 mAh g <superscript>-1</superscript> at 10 C. This study provides a facile strategy for transition metal borides and reveals the effect of heterostructure on catalytic and adsorption activity for LiPSs, offering a new viewpoint to apply boride in LSBs.<br /> (© 2023 Wiley-VCH GmbH.)

Details

Language :
English
ISSN :
1613-6829
Volume :
19
Issue :
29
Database :
MEDLINE
Journal :
Small (Weinheim an der Bergstrasse, Germany)
Publication Type :
Academic Journal
Accession number :
37026655
Full Text :
https://doi.org/10.1002/smll.202208281