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  In-situ formed porous silicon carbonitride/boron nitride composites to boost cathode performance in lithium sulfur batteries

Qu, F., Yu, Z., Widenmeyer, M., Tian, C., Yan, R., Tian, H., et al. (2024). In-situ formed porous silicon carbonitride/boron nitride composites to boost cathode performance in lithium sulfur batteries. Journal of Alloys and Compounds, 984: 174021, pp. 1-10. doi:10.1016/j.jallcom.2024.174021.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-1A4C-0 Version Permalink: https://hdl.handle.net/21.11116/0000-000F-7521-8
Genre: Journal Article

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 Creators:
Qu, Fangmu1, Author
Yu, Zhaoju1, Author
Widenmeyer, Marc1, Author
Tian, Chuanmu1, Author
Yan, Ruijuan, Author
Tian, Honghong1, Author
Kempf, Alexander1, Author
De Carolis, Dario M.1, Author
Hofmann, Jan P.1, Author
Weidenkaff, Anke1, Author
Riedel, Ralf1, Author
Graczyk-Zajac, Magdalena1, Author
Affiliations:
1External Organizations, ou_persistent22              

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Free keywords: Boric acid; Boron nitride; Carbon; Carbon carbon composites; Carbon nitride; Cathodes; III-V semiconductors; Lithium batteries; Lithium sulfur batteries; Porous silicon; Silicon carbide; Carbon rich; Cathode performance; Ceramic matrix; Electrochemical performance; Lithium/sulfur batteries; Porous carbons; Property; SiCN ceramic; Silicon carbo-nitride; Sulfur cathodes; Urea
 Abstract: Carbon-rich polymer-derived SiCN ceramic matrix serves as a stabilizing host for sulfur cathodes due to its robust, stress-accommodating properties and well-conductive carbon network. Herein, novel SiCN-BN composites are synthesized through the annealing of a polymer-derived SiCN ceramic alongside boric acid and urea. The prepared cathodes exhibit significantly improved electrochemical performance after sulfur immobilization within the resulting composites. Of particular note is the material annealed at 950 °C, designated as SiCN-BN-950/S. It exhibits a reversible capacity of 445 mAh/g showcasing 62 capacity retention over 60 cycles, using electrodes with an areal density of 3.5–3.8 mg/cm2 and a sulfur loading of 66 wt. Its good cycling stability is attributed to the remarkable synergistic interplay between BN on the surface and disordered carbon present within the SiCN ceramic matrix. The presence of BN enables effective polar adsorption of polysulfides, while the in-situ formed porous carbon contributes to enhanced electrical conductivity. This combination significantly elevates the overall electrochemical performance of the sulfur cathode. The successful utilization of these novel SiCN-BN composites, a remarkable advancement in sulfur cathode technology, opens up possibilities for further enhancing the efficiency and stability of energy storage systems. © 2024 The Authors

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Language(s): eng - English
 Dates: 2024-05-152024-05-15
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jallcom.2024.174021
BibTex Citekey: Qu2024
 Degree: -

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Title: Journal of Alloys and Compounds
  Abbreviation : J. Alloy. Comp.
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Elsevier B.V.
Pages: - Volume / Issue: 984 Sequence Number: 174021 Start / End Page: 1 - 10 Identifier: ISSN: 0925-8388
CoNE: https://pure.mpg.de/cone/journals/resource/954925567746