| Texto completo | |
| Autor(es): |
Souza, Breno L.
;
Mueller, Rafael
;
Kardjilov, Nikolay
;
Haerk, Eneli
;
de Oliveira, Paulo F. M.
;
Manke, Ingo
;
Risse, Sebastian
;
Torresi, Roberto M.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Power Sources; v. 657, p. 11-pg., 2025-11-30. |
| Resumo | |
This study focuses on the Microporous Thiophene Polymer (MTP-1), a porous organic polymer (POP) synthesized through environmentally friendly methods. After MTP-1 synthesis, sulfur (S8) and the resulting compound, MTP1/S8, is thoroughly characterized. Electrochemical tests show that MTP-1/S8 acts as a robust positive electrode, retaining over 70 % of its capacity after 100 cycles. UV-vis spectroscopy confirms the compound's ability to absorb and trap lithium polysulfides (LiPSs). Operando electrochemical impedance analysis reveals improved sulfur confinement in MTP-1/S8, evidenced by smaller variations in electrolyte resistance over cycling when compared to the Carbon Black/Sulfur (CB/S8) control electrode used as reference throughout the study. In contrast, CB/S8 exhibits significant resistance fluctuations, indicating greater polysulfide diffusion into the electrolyte and a stronger shuttle effect. Operando X-ray radiography experiments provide insights into the processes of sulfur formation and dissolution, correlating with specific capacity values. A distinct difference is observed in the size and distribution of sulfur particles between the two systems. The CB/S8 exhibits fewer but larger sulfur particles, suggesting lower polysulfide retention near the positive electrode. In contrast, MTP-1/S8 displays a higher number of smaller sulfur particles, indicating better polysulfide retention and enhanced nucleation kinetics. Overall, the green synthesis, advanced characterization, and use of in-situ and operando techniques emphasize MTP-1/S8 potential as a high-performance sulfur host. The findings contribute to lithiumsulfur battery development and improve the understanding of degradation pathways. (AU) | |
| Processo FAPESP: | 21/00675-4 - Arquitetura de materiais para armazenamento de energia eletroquímica e catálise |
| Beneficiário: | Roberto Manuel Torresi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/09341-1 - Baterias de lítio-enxofre: nova geração no desenvolvimento de eletrodos positivos baseados em compósitos de MOFs/enxofre |
| Beneficiário: | Breno Luiz de Souza |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 21/11814-5 - Investigações in-situ e in-operando de sistemas porosos aplicados a baterias de lítio/enxofre |
| Beneficiário: | Breno Luiz de Souza |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |