About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Molecular Approaches to Ceramics; Synthesis, Processing, Modeling, and Derived Ceramics
|
| Presentation Title |
Polymer-Derived SiTiOC Ceramics for Enhanced Polysulfide Confinement in Lithium–Sulfur Cells |
| Author(s) |
Arijit Roy, Murilo Machado Amaral, Manuel J. Pinzón C., Otavio Marques, Shakir Bin Mujib, Hudson Zanin, Johanna Nelson Weker, Gurpreet Singh |
| On-Site Speaker (Planned) |
Arijit Roy |
| Abstract Scope |
Developing sulfur host materials capable of immobilizing lithium polysulfides is essential for improving the stability of lithium–sulfur batteries. Materials with polar surface sites are promising because they can strongly interact with dissolved polysulfides. Polymer-derived ceramics are attractive sulfur hosts due to the coexistence of conductive carbon regions and polar domains, enabling both physical confinement and chemical adsorption. In this study, a titanium-modified silicon oxycarbide ceramic (SiTiOC) was synthesized through crosslinking and pyrolysis of blended polymer precursors and evaluated as a sulfur host. Sulfur-loaded SiTiOC cathodes exhibited stable electrochemical performance during cycling. Spectroscopic analysis confirmed the reversible conversion of lithium polysulfides, while operando transmission X-ray microscopy revealed sulfur dissolution during initial discharge followed by improved structural stability in later cycles. These results demonstrate that the SiTiOC host effectively suppresses polysulfide shuttling and accommodates sulfur volume changes, highlighting its potential for advanced lithium–sulfur batteries. |