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Šić E, Rohrer J, Ricohermoso EI, Albe K, Ionescu E, Riedel R, Breitzke H, Gutmann T, Buntkowsky G. SiCO Ceramics as Storage Materials for Alkali Metals/Ions: Insights on Structure Moieties from Solid-State NMR and DFT Calculations. CHEMSUSCHEM 2023:e202202241. [PMID: 36892993 DOI: 10.1002/cssc.202202241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 03/08/2023] [Indexed: 06/18/2023]
Abstract
Polymer-derived silicon oxycarbide ceramics (SiCO) have been considered as potential anode materials for lithium- and sodium-ion batteries. To understand their electrochemical storage behavior, detailed insights into structural sites present in SiCO are required. In this work, the study of local structures in SiCO ceramics containing different amounts of carbon is presented. 13 C and 29 Si solid-state MAS NMR spectroscopy combined with DFT calculations, atomistic modeling, and EPR investigations, suggest significant changes in the local structures of SiCO ceramics even by small changes in the material composition. The provided findings on SiCO structures will contribute to the research field of polymer-derived ceramics, especially to understand electrochemical storage processes of alkali metal/ions such as Na/Na+ inside such networks in the future.
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Affiliation(s)
- Edina Šić
- Eduard Zintl Institute for Inorganic and Physical Chemistry, Technical University of Darmstadt, 64287, Darmstadt, Germany
| | - Jochen Rohrer
- Department of Materials and Earth Sciences, Materials Modelling Division, Technical University of Darmstadt, 64287, Darmstadt, Germany
| | - Emmanuel Iii Ricohermoso
- Department of Materials and Earth Sciences, Group of Dispersive Solids, Technical University of Darmstadt, 64287, Darmstadt, Germany
| | - Karsten Albe
- Department of Materials and Earth Sciences, Materials Modelling Division, Technical University of Darmstadt, 64287, Darmstadt, Germany
| | - Emmanuel Ionescu
- Department of Materials and Earth Sciences, Group of Dispersive Solids, Technical University of Darmstadt, 64287, Darmstadt, Germany
- Fraunhofer IWKS, Department of Digitalization of Resources, Brentanostr. 2a, 63755, Alzenau, Germany
| | - Ralf Riedel
- Department of Materials and Earth Sciences, Group of Dispersive Solids, Technical University of Darmstadt, 64287, Darmstadt, Germany
| | - Hergen Breitzke
- Eduard Zintl Institute for Inorganic and Physical Chemistry, Technical University of Darmstadt, 64287, Darmstadt, Germany
| | - Torsten Gutmann
- Eduard Zintl Institute for Inorganic and Physical Chemistry, Technical University of Darmstadt, 64287, Darmstadt, Germany
| | - Gerd Buntkowsky
- Eduard Zintl Institute for Inorganic and Physical Chemistry, Technical University of Darmstadt, 64287, Darmstadt, Germany
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Rapid and damage-free outgassing of implanted helium from amorphous silicon oxycarbide. Sci Rep 2018; 8:5009. [PMID: 29568069 PMCID: PMC5864747 DOI: 10.1038/s41598-018-23426-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 03/13/2018] [Indexed: 12/03/2022] Open
Abstract
Damage caused by implanted helium (He) is a major concern for material performance in future nuclear reactors. We use a combination of experiments and modeling to demonstrate that amorphous silicon oxycarbide (SiOC) is immune to He-induced damage. By contrast with other solids, where implanted He becomes immobilized in nanometer-scale precipitates, He in SiOC remains in solution and outgasses from the material via atomic-scale diffusion without damaging its free surfaces. Furthermore, the behavior of He in SiOC is not sensitive to the exact concentration of carbon and hydrogen in this material, indicating that the composition of SiOC may be tuned to optimize other properties without compromising resistance to implanted He.
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Sun H, Zhao K. Atomistic Origins of High Capacity and High Structural Stability of Polymer-Derived SiOC Anode Materials. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35001-35009. [PMID: 28927267 DOI: 10.1021/acsami.7b10906] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Capacity and structural stability are often mutually exclusive properties of electrodes in Li-ion batteries (LIBs): a gain in capacity is usually accompanied by the undesired large volumetric change of the host material upon lithiation. Polymer-derived ceramics, such as silicon oxycarbide (SiOC) of hybrid Si-O-C bonds, show an exceptional combination of high capacity and superior structural stability. We investigate the atomistic origins of the unique chemomechanical performance of carbon-rich SiOC using the first-principles theoretical approach. The atomic model of SiOC is composed of continuous Si-O-C units caged by a graphene-like cellular network and percolated nanovoids. The segregated sp2 carbon network serves as the backbone to maintain the structural stability of the lattice. Li insertion is first absorbed at the nanovoid sites, and then it is accommodated by the SiOC tetrahedral units, excess C atoms, and topological defects at the edge of or within the segregated carbon network. SiOC expands up to 22% in volumetric strain at the fully lithiated capacity of 1230 mA h/g. We examine in great detail the evolution of the microscopic features of the SiOC molecule in the course of Li reactions. The first-principles modeling provides a fundamental understanding of the physicochemical properties of Si-based glass ceramics for their application in LIBs.
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Affiliation(s)
- Hong Sun
- School of Mechanical Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - Kejie Zhao
- School of Mechanical Engineering, Purdue University , West Lafayette, Indiana 47907, United States
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Modeling of amorphous SiC xO 6/5 by classical molecular dynamics and first principles calculations. Sci Rep 2017; 7:42705. [PMID: 28195190 PMCID: PMC5307379 DOI: 10.1038/srep42705] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 01/12/2017] [Indexed: 11/30/2022] Open
Abstract
Polymer-derived silicon oxycarbide (SiCO) presents excellent performance for high temperature and lithium-ion battery applications. Current experiments have provided some information on nano-structure of SiCO, while it is very challenging for experiments to take further insight into the molecular structure and its relationship with properties of materials. In this work, molecular dynamics (MD) based on empirical potential and first principle calculation were combined to investigate amorphous SiCxO6/5 ceramics. The amorphous structures of SiCO containing silicon-centered mix bond tetrahedrons and free carbon were successfully reproduced. The calculated radial distribution, angular distribution and Young’s modulus were validated by current experimental data, and more details on molecular structure were discussed. The change in the slope of Young’s modulus is related to the glass transition temperature of the material. The proposed modeling approach can be used to predict the properties of SiCO with different compositions.
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