| Texto completo | |
| Autor(es): |
Silva, Vinicius D.
;
Goncalves, Josue M.
;
Dias, Yasmin J.
;
Simoes, Thiago A.
;
Macedo, Daniel A.
;
Shahbazian-Yassar, Reza
;
Torresi, Roberto M.
;
Yarin, Alexander L.
;
Medeiros, Eliton S.
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Materials Science; v. 59, n. 6, p. 17-pg., 2024-02-03. |
| Resumo | |
The development of self-supporting electrodes, which are binder-, and additives-free, is essential for increased performance and practical applications of lithium-ion batteries (LIBs). With this aim, we report here the synthesis of carbon nanofiber (CNF) composites containing silica (SiO2) nanoparticles via Supersonic Solution Blowing (SSB) as self-supporting electrodes of LIBs. Nanofibers with average diameter in the 86-271 nm range, and specific surface area (SSA) in the 619-1981 m2/g were obtained. SiO2 content altered not only the diameter and the SSA, but also the pore-size distribution. A tri-modal pore-size distribution pattern was obtained for all specimens. Used as a self-supporting anode material for LIBs, carbon nanofiber-based composite electrodes achieved high reversible capacity, high-rate capacity, and superior cyclic stability (305-444 mAh g-1 at 0.1 A g-1 after 200 cycles), at the Coulombic efficiencies of 97-99%. Lastly, enhanced capacity can be attributed to the addition of SiO2 nanoparticles up to 2.5%. However, for higher silica content, the loss in performance can be attributed to an increase in the mean nanofiber diameter and a drastic reduction in SSA and porosity caused by the presence of nanoparticles. (AU) | |
| Processo FAPESP: | 20/06176-7 - Estudo dos materiais de eletrodos de hidróxido lamelares com microscopia eletrônica de transmissão in situ |
| Beneficiário: | Josué Martins Gonçalves |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |
| Processo FAPESP: | 22/12609-9 - Nanofibras de hard carbon como eletrodo negativo auto-suportado para a próxima geração de baterias de íons de sódio |
| Beneficiário: | Vinícius Dias Silva |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| 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 |