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Tubular CoFeP@CN as a Mott–Schottky catalyst with multiple adsorption sites for robust lithium-sulfur batteries

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Zhang, Chaoqi
Du, Ruifeng
Jacas Biendicho, JordiMés informació
Yang, Dawei
Zhang, Ting
Wang, Xiang
Arbiol, Jordi
Llorca Piqué, JordiMés informacióMés informacióMés informació
Morante Lleonart, Joan RamonMés informació
Cabot, Andreu
Document typeArticle
Defense date2021-06-24
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
The shuttle effect and the sluggish reaction kinetics of lithium polysulfide (LiPS) seriously compromise the performance of lithium–sulfur batteries (LSBs). To overcome these limitations and enable the fabrication of robust LSBs, here the use of a Mott–Schottky catalyst based on bimetallic phos- phide CoFeP nanocrystals supported on carbon nitride tubular nanostruc- tures as sulfur hosts is proposed. Theoretical calculations and experimental data confirm that CoFeP@CN composites are characterized by a suitable electronic structure and charge rearrangement that allows them to act as a Mott–Schottky catalyst to accelerate LiPS conversion. In addition, the tubular geometry of CoFeP@CN composites facilitates the diffusion of Li ions, accommodates volume change during the reaction, and offers abundant lithi- ophilic/sulfiphilic sites to effectively trap soluble LiPS. Therefore, S@CoFeP@ CN electrodes deliver a superior rate performance of 630 mAh g-1 at 5 C, and remarkable cycling stability with 90.44% capacity retention over 700 cycles. Coin cells with high sulfur loading, 4.1 mg cm-2, and pouch cells with 0.1 Ah capacities are further produced to validate their superior cycling stability. In addition, it is demonstrated here that CoFeP@CN hosts greatly alleviate the often overlooked issues of low energy efficiency and serious self-discharging in LSBs.
CitationZhang, C. [et al.]. Tubular CoFeP@CN as a Mott–Schottky catalyst with multiple adsorption sites for robust lithium-sulfur batteries. "Advanced Energy Materials", 24 Juny 2021, vol. 11, núm. 24, p. 2100432:1-2100432:!4. 
URIhttp://hdl.handle.net/2117/352772
DOI10.1002/aenm.202100432
ISSN1614-6840
Publisher versionhttps://onlinelibrary.wiley.com/doi/10.1002/aenm.202100432
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  • NEMEN - Nanoenginyeria de materials aplicats a l'energia - Articles de revista [244]
  • IREC - Catalonia Institute for Energy Research - Articles de revista [91]
  • Departament d'Enginyeria Química - Articles de revista [1.992]
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