Promoting Polysulfide Redox Reactions through Electronic Spin Manipulation

Catalytic additives able to accelerate the lithium–sulfur redox reaction are a key component of sulfur cathodes in lithium–sulfur batteries (LSBs). Their design focuses on optimizing the charge distribution within the energy spectra, which involves refinement of the distribution and occupancy of the...

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Veröffentlicht in:ACS nano 2024-07, Vol.18 (29), p.19268-19282
Hauptverfasser: Yu, Jing, Huang, Chen, Usoltsev, Oleg, Black, Ashley P., Gupta, Kapil, Spadaro, Maria Chiara, Pinto-Huguet, Ivan, Botifoll, Marc, Li, Canhuang, Herrero-Martín, Javier, Zhou, Jinyuan, Ponrouch, Alexandre, Zhao, Ruirui, Balcells, Lluís, Zhang, Chao Yue, Cabot, Andreu, Arbiol, Jordi
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container_end_page 19282
container_issue 29
container_start_page 19268
container_title ACS nano
container_volume 18
creator Yu, Jing
Huang, Chen
Usoltsev, Oleg
Black, Ashley P.
Gupta, Kapil
Spadaro, Maria Chiara
Pinto-Huguet, Ivan
Botifoll, Marc
Li, Canhuang
Herrero-Martín, Javier
Zhou, Jinyuan
Ponrouch, Alexandre
Zhao, Ruirui
Balcells, Lluís
Zhang, Chao Yue
Cabot, Andreu
Arbiol, Jordi
description Catalytic additives able to accelerate the lithium–sulfur redox reaction are a key component of sulfur cathodes in lithium–sulfur batteries (LSBs). Their design focuses on optimizing the charge distribution within the energy spectra, which involves refinement of the distribution and occupancy of the electronic density of states. Herein, beyond charge distribution, we explore the role of the electronic spin configuration on the polysulfide adsorption properties and catalytic activity of the additive. We showcase the importance of this electronic parameter by generating spin polarization through a defect engineering approach based on the introduction of Co vacancies on the surface of CoSe nanosheets. We show vacancies change the electron spin state distribution, increasing the number of unpaired electrons with aligned spins. This local electronic rearrangement enhances the polysulfide adsorption, reducing the activation energy of the Li–S redox reactions. As a result, more uniform nucleation and growth of Li2S and an accelerated liquid–solid conversion in LSB cathodes are obtained. These translate into LSB cathodes exhibiting capacities up to 1089 mA h g–1 at 1 C with 0.017% average capacity loss after 1500 cycles, and up to 5.2 mA h cm–2, with 0.16% decay per cycle after 200 cycles in high sulfur loading cells.
doi_str_mv 10.1021/acsnano.4c05278
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title Promoting Polysulfide Redox Reactions through Electronic Spin Manipulation
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