Spin Effect to Promote Reaction Kinetics and Overall Performance of Lithium‐Sulfur Batteries under External Magnetic Field

Lithium‐sulfur batteries (LSBs) are still limited by the shuttle of lithium polysulfides (LiPS) and the slow Li−S reaction. Herein, we demonstrate that when using cobalt sulfide as a catalytic additive, an external magnetic field generated by a permanent magnet can significantly improve the LiPS ads...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2022-12, Vol.61 (49), p.e202211570-n/a
Main Authors: Zhang, Chao Yue, Zhang, Chaoqi, Sun, Guo Wen, Pan, Jiang Long, Gong, Li, Sun, Geng Zhi, Biendicho, Jordi Jacas, Balcells, Lluís, Fan, Xiao Long, Morante, Joan Ramon, Zhou, Jin Yuan, Cabot, Andreu
Format: Article
Language:English
Subjects:
Adsorption
Cobalt
Cobalt sulfide
Cobalt Sulfides
Decay rate
Electrochemistry
Electron spin
Electrospinning
Energy costs
Hybridization
Kinetics
Lithium
Lithium Polysulfide
Lithium sulfur batteries
Lithium-Sulfur Battery
Magnetic fields
Permanent magnets
Polarization (spin alignment)
Reaction kinetics
Spin Polarization
Sulfur
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Summary:Lithium‐sulfur batteries (LSBs) are still limited by the shuttle of lithium polysulfides (LiPS) and the slow Li−S reaction. Herein, we demonstrate that when using cobalt sulfide as a catalytic additive, an external magnetic field generated by a permanent magnet can significantly improve the LiPS adsorption ability and the Li−S reaction kinetics. More specifically, the results show both experimentally and theoretically how an electron spin polarization of Co ions reduces electron repulsion and enhances the degree of orbital hybridization, thus resulting in LSBs with unprecedented performance and stability. Under an external magnetic field, LSBs with 0.0084 % per cycle decay rate at 2 C during 8150 cycles are produced. Overall, this work not only demonstrates an effective strategy to promote LiPS adsorption and electrochemical conversion in LSBs at no additional energy cost but also enriches the application of the spin effect in the electrocatalysis fields. Spin polarization in CoSx loaded on carbon nanofibers obtained by electrospinning method regulate LiPS conversion reaction. The external magnetic field induces electron spin polarization in CoSx, reducing electron repulsion, and enhancing the degree of 2p–3d orbital hybridization, thus accelerating the conversion ability of lithium polysulfides and enabling carbon nanofiber/CoSx/S cathodes with unprecedented performance and stability.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202211570