Ionic conductivity optimization of composite polymer electrolytes through filler particle chemical modification
Autor: | Joseph A. Libera, Andres Villa, Juan Carlos Verduzco, Ernesto E. Marinero |
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Rok vydání: | 2021 |
Předmět: |
Materials science
General Chemical Engineering General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Electrolyte Condensed Matter - Soft Condensed Matter 010402 general chemistry Electrochemistry 01 natural sciences Ionic conductivity General Materials Science chemistry.chemical_classification Condensed Matter - Materials Science General Engineering Chemical modification Materials Science (cond-mat.mtrl-sci) Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Amorphous solid Dielectric spectroscopy chemistry Chemical engineering Particle Soft Condensed Matter (cond-mat.soft) 0210 nano-technology |
DOI: | 10.48550/arxiv.2103.09887 |
Popis: | The addition of filler particles to polymer electrolytes is known to increment their ionic conductivity (IC). A detailed understanding of how the interactions between the constituent materials are responsible for the enhancement, remains to be developed. A significant contribution is ascribed to an increment of the polymer amorphous fraction, induced by the fillers, resulting in the formation of higher ionic conductivity channels in the polymer matrix. However, the dependence of IC on the particle weight load and its composition on the polymer morphology is not fully understood. This work investigates Li ion transport in composite polymer electrolytes (CPE) comprising Bi-doped LLZO particles embedded in PEO: LiTFSI matrixes. We find that the IC optimizes for very low particle weight loads (5 to 10%) and that both its magnitude and the load required, strongly depend on the garnet particle composition. Based on structural characterization results and electrochemical impedance spectroscopy, a mechanism is proposed to explain these findings. It is suggested that the Li-molar content in the garnet particle controls its interactions with the polymer matrix, resulting at the optimum loads reported, in the formation of high ionic conductivity channels. We propose that filler particle chemical manipulation of the polymer morphology is a promising avenue for the further development of composite polymer electrolytes. Comment: 35 pages, 13 figures |
Databáze: | OpenAIRE |
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