| Texto completo | |
| Autor(es): Mostrar menos - |
Keshri, Shweta R.
;
Mandal, Indrajeet
;
Ganisetti, Sudheer
;
Kasimuthumaniyan, S.
;
Kumar, Rajesh
;
Gaddam, Anuraag
;
Shelke, Ankita
;
Ajithkumar, Thalasseril G.
;
Gosvami, Nitya Nand
;
Krishnan, N. M. Anoop
;
Allu, Amarnath R.
Número total de Autores: 11
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACTA MATERIALIA; v. 227, p. 12-pg., 2022-04-01. |
| Resumo | |
Glasses are emerging as promising and efficient solid electrolytes for all-solid-state sodium-ion batteries. However, they still suffer from poor ionic conductivity and crack-resistance, which need to be improved for better battery performance, reliability, and service life. The current study shows a significant enhancement in crack resistance (from 11.3 N to 32.9 N) for Na3Al (1.8) Si-1.65 P1.8O12 glass (Ag-0 glass) upon Na+ -Ag+ ion-exchange (IE) due to compressive stresses generated in the glass surface while the ionic conductivity values (similar to 10(-5) S/cm at 473 K) were retained. In this study, magic angle spinning-nuclear magnetic resonance (MAS-NMR), molecular dynamics (MD) simulations, Vickers micro hardness, and impedance spectroscopic techniques were used to evaluate the intermediate-range structure, atomic structure, crack resistance and conductivity of the glass. MAS-NMR and MD simulations confirm the presence of Si-OAl-O-P groups in the glass, thus enabling formation of Na percolated channel regions. AC-conductivity analysis for Ag-0 and ion-exchanged Ag-0 glass suggests that the mobility of Na+ ion increases with increasing temperature. It is observed that the measured mean square displacement (root < R-2(t(p))>) for sodium cations using AC-conductivity isotherms is nearly constant up to 448 K and then increases with increasing temperature up to 523 K. From the impedance spectra for ion-exchanged Ag-0 glass, it is identified that the increase in root < R-2 (t(nu))> and thereby, the mobility of sodium-ions for Ag-0 glass is due to the structural variations in the Ag-0 glass with increasing the temperature. Overall, the mechanisms presented in this article helps in formulating better glass based electrolyte materials for room temperature or high temperature sodium-ion batteries. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 21/06370-0 - Correlações entre composições, estrutura e propriedades em biovidros contendo boro, elucidado por ressonância magnética nuclear do estado sólido |
| Beneficiário: | Anuraag Gaddam |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |