University of Oulu

Santos, H. S., Sliz, R., Nguyen, H., Srivastava, S., Ramteke, D., Fabritius, T., Lassi, U., & Kinnunen, P. (2022). Hybrid amorphous-crystalline silicate composites as feasible solid-state electrolytes. Materials & Design, 217, 110599.

Hybrid amorphous-crystalline silicate composites as feasible solid-state electrolytes

Saved in:
Author: Santos, Hellen S.1; Sliz, Rafal2; Nguyen, Hoang1;
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, Oulu, Finland
2Optoelectronics and Measurement Techniques Research Unit, University of Oulu, Oulu, Finland
3Research Unit of Sustainable Chemistry, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.7 MB)
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2022-10-03


Solid-state electrolytes (SSEs) are considered as the most promising materials for enabling the safer, more efficient, and feasible solution to address the market demands for lithium-ion batteries. The current work investigates the production of inorganic SSEs from silicate minerals, which are abundant materials in natural resources (kaolinite) as well as in industrial waste-streams (amorphous silica). The synthesized materials showed high amorphous contents combined with lithium silicate phases at variable proportions, according to the molar proportions of the reacting system. The materials have been characterized with XRD, SEM/EDS, FTIR, TGA-DSC, XPS, EIS, and density measurements. The results showed that hybrid structures of amorphous and crystalline silicates can form an ordered hotchpotch morphology. The best of the hybrid SSEs presented ionic conductivity values of 1.42 × 10-4 and 1.30 × 10-4 Scm-1 for samples with total amorphous contents of 73 and 83 wt%, respectively. The connected structure between amorphous and crystalline phases in a hotchpotch structure is hypothesized to assist the hopping of the Li+ ions via combined mechanisms of segmental motion of the silicates amorphous chains with defects in the crystalline phases. The proposed approach may offer new research paths towards the low-cost scalable production of SSEs.

see all

Series: Materials & design
ISSN: 0264-1275
ISSN-E: 1873-4197
ISSN-L: 0264-1275
Volume: 217
Pages: 1 - 16
Article number: 110599
DOI: 10.1016/j.matdes.2022.110599
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
216 Materials engineering
220 Industrial biotechnology
Funding: This work has been executed as part of the SolBat project, financed by the European Union/Interreg Nord funding (20202885). PK and HN are grateful for the support from the University of Oulu (Finland) and the Academy of Finland Profi5 (project number: 326291). Special acknowledgements are given to Max Fonseca and Fabricio Q. Venâncio, who have designed the graphical abstract and mechanism. The obtained images are a production from Terturium (, from their specialty in scientific communication design. HSS acknowledges Elisa Wirkkala and Jarno Karvonen for the helpful assistance in the daily laboratorial routine, as well as Tapani Mäntykenttä for the innovative production of the sample molds.
Dataset Reference: Supplementary data to this article can be found online at
Copyright information: © 2022 The Authors. This is an open access article under the CC BY-NC-ND license (