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Electrochemical Performance of Carbon-Rich Silicon Carbonitride Ceramic as Support for Sulfur Cathode in Lithium Sulfur Battery

Qu, Fangmu ; Yu, Zhaoju ; Krol, Monika ; Chai, Nan ; Riedel, Ralf ; Graczyk-Zajac, Magdalena (2022)
Electrochemical Performance of Carbon-Rich Silicon Carbonitride Ceramic as Support for Sulfur Cathode in Lithium Sulfur Battery.
In: Nanomaterials, 2022, 12 (8)
doi: 10.26083/tuprints-00021293
Article, Secondary publication, Publisher's Version

Abstract

As a promising matrix material for anchoring sulfur in the cathode for lithium-sulfur (Li-S) batteries, porous conducting supports have gained much attention. In this work, sulfur-containing C-rich SiCN composites are processed from silicon carbonitride (SiCN) ceramics, synthesized at temperatures from 800 to 1100 °C. To embed sulfur in the porous SiCN matrix, an easy and scalable procedure, denoted as melting-diffusion method, is applied. Accordingly, sulfur is infiltrated under solvothermal conditions at 155 °C into pores of carbon-rich silicon carbonitride (C-rich SiCN). The impact of the initial porosity and microstructure of the SiCN ceramics on the electrochemical performance of the synthesized SiCN-sulfur (SiCN-S) composites is analysed and discussed. A combination of the mesoporous character of SiCN and presence of a disordered free carbon phase makes the electrochemical performance of the SiCN matrix obtained at 900 °C superior to that of SiCN synthesized at lower and higher temperatures. A capacity value of more than 195 mAh/g over 50 cycles at a high sulfur content of 66 wt.% is achieved.

Item Type: Article
Erschienen: 2022
Creators: Qu, Fangmu ; Yu, Zhaoju ; Krol, Monika ; Chai, Nan ; Riedel, Ralf ; Graczyk-Zajac, Magdalena
Type of entry: Secondary publication
Title: Electrochemical Performance of Carbon-Rich Silicon Carbonitride Ceramic as Support for Sulfur Cathode in Lithium Sulfur Battery
Language: English
Date: April 2022
Year of primary publication: 2022
Publisher: MDPI
Journal or Publication Title: Nanomaterials
Volume of the journal: 12
Issue Number: 8
Collation: 14 Seiten
DOI: 10.26083/tuprints-00021293
URL / URN: https://tuprints.ulb.tu-darmstadt.de/21293
Corresponding Links:
Origin: Secondary publication DeepGreen
Abstract:

As a promising matrix material for anchoring sulfur in the cathode for lithium-sulfur (Li-S) batteries, porous conducting supports have gained much attention. In this work, sulfur-containing C-rich SiCN composites are processed from silicon carbonitride (SiCN) ceramics, synthesized at temperatures from 800 to 1100 °C. To embed sulfur in the porous SiCN matrix, an easy and scalable procedure, denoted as melting-diffusion method, is applied. Accordingly, sulfur is infiltrated under solvothermal conditions at 155 °C into pores of carbon-rich silicon carbonitride (C-rich SiCN). The impact of the initial porosity and microstructure of the SiCN ceramics on the electrochemical performance of the synthesized SiCN-sulfur (SiCN-S) composites is analysed and discussed. A combination of the mesoporous character of SiCN and presence of a disordered free carbon phase makes the electrochemical performance of the SiCN matrix obtained at 900 °C superior to that of SiCN synthesized at lower and higher temperatures. A capacity value of more than 195 mAh/g over 50 cycles at a high sulfur content of 66 wt.% is achieved.

Uncontrolled Keywords: SiCN ceramic matrix, disordered carbon, porous structure, sulfur cathode
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-212935
Classification DDC: 500 Science and mathematics > 540 Chemistry
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 06 May 2022 11:05
Last Modified: 30 Jun 2022 09:26
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