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- Title
LiSn<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>-based polymer-in-ceramic composite electrolyte with high ionic conductivity for all-solid-state lithium batteries.
- Authors
Ahmed, Shadab Ali; Pareek, Tanvi; Dwivedi, Sushmita; Badole, Manish; Kumar, Sunil
- Abstract
In this work, fabrication and electrochemical behavior of polymer-in-ceramic composite electrolytes based on lithium-ion conducting triclinic LiSn2(PO4)3 (LSP) for all-solid-state batteries are reported. The composite ceramic electrolyte (CCE) was fabricated using polymeric salt (PEO+LiClO4) as a filler to the ceramic compound LSP using a simple hot-press technique. The x-ray diffraction and Fourier transform infrared spectroscopy (FTIR) studies were performed to determine the structure of the composite electrolyte. Composite electrolyte containing 30 wt.% PEO+LiClO4 exhibit the highest conductivity of ~ 3.48 × 10−5 Scm−1 at 27 °C, which improves to ~ 1.18 × 10−4 Scm−1 at 60 °C. The low activation energy calculated to be ~ 0.34 eV results from additional mobile lithium-ion in a composite electrolyte. The field emission scanning electron microscopy (FESEM) and energy-dispersive x-ray spectroscopy (EDX) reveals the Li+ diffusion route along with the 3D inter-connected LSP-(PEO+LiClO4) interfaces and distribution of polymeric salt to LSP. The ionic and Li+ transference numbers calculated by a combination of ac signal and dc polarization were found to be ~ 0.99 and ~ 0.39, respectively. The electrochemical performance of the CCE was tested using the cyclic voltammetry (CV) and galvanostatic charging-discharging (GCD) in symmetric cell employing lithium metal as the electrode. Composite electrolyte exhibited highly reversible lithium stripping/plating behavior at low current density. All-solid-state cells fabricated using LiMn2O4 as the cathode, Li metal as the anode, and the LSP-30 (PEO+LiClO4) as the solid electrolyte deliver a high specific discharge capacity of ~ 103.3 mAhg−1 at a current density of 100 μAcm−2.
- Subjects
SOLID state batteries; SUPERIONIC conductors; IONIC conductivity; LITHIUM cells; FOURIER transform infrared spectroscopy; ELECTROLYTES; FIELD emission electron microscopy; COMPOSITE structures
- Publication
Journal of Solid State Electrochemistry, 2020, Vol 24, Issue 10, p2407
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-020-04783-z