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Effect of morphology of C-rich silicon carbonitride ceramic on electrochemical properties of sulfur cathode for Li-S battery

Qu, Fangmu ; Graczyk-Zajac, Magdalena ; Vrankovic, Dragoljub ; Chai, Nan ; Yu, Zhaoju ; Riedel, Ralf (2021):
Effect of morphology of C-rich silicon carbonitride ceramic on electrochemical properties of sulfur cathode for Li-S battery.
In: Electrochimica Act, 384, p. 138265. Elsevier, ISSN 0013-4686, e-ISSN 1873-3859,
DOI: 10.1016/j.electacta.2021.138265,
[Article]

Abstract

Porous conducting materials represent a promising support for the immobilization of sulfur in the cathode of lithium-sulfur (Li-S) batteries. Herein, we provide an easy and scalable procedure for the preparation of such cathodes. This strategy consists of an infiltration of sulfur under solvothermal conditions at 155 degrees C into pores of carbon-rich silicon carbonitride (C-rich SiCN). Porous polymer-derived SiCN ceramics possess a unique combination of high electronic conductivity and robust, stress accommodating mechanical properties. The impact of the initial porosity and elemental composition of SiCN ceramics on the electrochemical performance of SiCN-S composites is addressed in this work. It is shown that material pyrolyzed at 1000 degrees C revealing a mesoporous character in line with the presence of a free carbon phase dispersed in SiCN demonstrates the best electrochemical stability and the highest capacity (more than 310 mAh/g over 40 cycles) at a high sulphur content of 66 wt.%.

Item Type: Article
Erschienen: 2021
Creators: Qu, Fangmu ; Graczyk-Zajac, Magdalena ; Vrankovic, Dragoljub ; Chai, Nan ; Yu, Zhaoju ; Riedel, Ralf
Title: Effect of morphology of C-rich silicon carbonitride ceramic on electrochemical properties of sulfur cathode for Li-S battery
Language: English
Abstract:

Porous conducting materials represent a promising support for the immobilization of sulfur in the cathode of lithium-sulfur (Li-S) batteries. Herein, we provide an easy and scalable procedure for the preparation of such cathodes. This strategy consists of an infiltration of sulfur under solvothermal conditions at 155 degrees C into pores of carbon-rich silicon carbonitride (C-rich SiCN). Porous polymer-derived SiCN ceramics possess a unique combination of high electronic conductivity and robust, stress accommodating mechanical properties. The impact of the initial porosity and elemental composition of SiCN ceramics on the electrochemical performance of SiCN-S composites is addressed in this work. It is shown that material pyrolyzed at 1000 degrees C revealing a mesoporous character in line with the presence of a free carbon phase dispersed in SiCN demonstrates the best electrochemical stability and the highest capacity (more than 310 mAh/g over 40 cycles) at a high sulphur content of 66 wt.%.

Journal or Publication Title: Electrochimica Act
Journal volume: 384
Publisher: Elsevier
Uncontrolled Keywords: SiCN ceramic matrix, Disordered carbon, Porous structure, Sulfur cathode, Pyrolysis temperature, Lithium, Capacity, Diffusion, Ion, Electrode, Composite, Conversion, Challenges, Anodes, Paper
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: 01 Jul 2021 05:38
DOI: 10.1016/j.electacta.2021.138265
Additional Information:

China Scholarship Council, Grant Number 201904910776

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