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The influence of pyrolysis temperature on the electrochemical behavior of porous carbon-rich SiCN polymer-derived ceramics

Storch, Mathias and Vrankovic, Dragoljub and Graczyk-Zajac, Magdalena and Riedel, Ralf (2018):
The influence of pyrolysis temperature on the electrochemical behavior of porous carbon-rich SiCN polymer-derived ceramics.
In: Solid State Ionics, Elsevier Science Publishing, pp. 59-64, 315, ISSN 01672738,
DOI: 10.1016/j.ssi.2017.11.032,
[Online-Edition: https://doi.org/10.1016/j.ssi.2017.11.032],
[Article]

Abstract

Within this study we report on the impact of the pyrolysis temperature on the structural and electrochemical properties of porous carbon-rich polymer-derived silicon carbonitride (SiCN) ceramics. Microstructural features of the synthesized materials were characterized in detail and discussed with respect to the lithium storage properties. X-ray diffraction study reveals the amorphous nature of the pyrolysed ceramics up to 1100 °C, while a crystalline SiC-phase is formed at 1400 °C. Micro-Raman spectroscopy shows that pyrolysed samples contain a free disordered carbon phase which tends to order with increasing pyrolysis temperature. Galvanostatic cycling with potential limitation enables to monitor the lithiation and delithiation performance. High irreversible losses are identified during the first cycle lithiation due to formation of SEI. Nevertheless the highest electrode capacities are recorded for the sample pyrolysed at 900 °C reaching a first cycle reversible capacity of 447 mAh·g− 1 and a 100th cycle reversible capacity of 534 mAh·g− 1 at a current of 72 mA·g− 1. Further it is found that the prepared materials offer improved high current lithium storage ability compared to dense SiCN ceramics reported in literature so far.

Item Type: Article
Erschienen: 2018
Creators: Storch, Mathias and Vrankovic, Dragoljub and Graczyk-Zajac, Magdalena and Riedel, Ralf
Title: The influence of pyrolysis temperature on the electrochemical behavior of porous carbon-rich SiCN polymer-derived ceramics
Language: English
Abstract:

Within this study we report on the impact of the pyrolysis temperature on the structural and electrochemical properties of porous carbon-rich polymer-derived silicon carbonitride (SiCN) ceramics. Microstructural features of the synthesized materials were characterized in detail and discussed with respect to the lithium storage properties. X-ray diffraction study reveals the amorphous nature of the pyrolysed ceramics up to 1100 °C, while a crystalline SiC-phase is formed at 1400 °C. Micro-Raman spectroscopy shows that pyrolysed samples contain a free disordered carbon phase which tends to order with increasing pyrolysis temperature. Galvanostatic cycling with potential limitation enables to monitor the lithiation and delithiation performance. High irreversible losses are identified during the first cycle lithiation due to formation of SEI. Nevertheless the highest electrode capacities are recorded for the sample pyrolysed at 900 °C reaching a first cycle reversible capacity of 447 mAh·g− 1 and a 100th cycle reversible capacity of 534 mAh·g− 1 at a current of 72 mA·g− 1. Further it is found that the prepared materials offer improved high current lithium storage ability compared to dense SiCN ceramics reported in literature so far.

Journal or Publication Title: Solid State Ionics
Volume: 315
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Porous, Silicon carbonitride, Polymer-derived ceramic, Carbon organization, Lithium-ion battery
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: 17 Dec 2018 15:47
DOI: 10.1016/j.ssi.2017.11.032
Official URL: https://doi.org/10.1016/j.ssi.2017.11.032
Funders: We gratefully acknowledge the financial support of the German Research Foundation (DFG) SPP1473/JP8.
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