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 |
| Volume of the journal: | 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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