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Influence of Particle Size and Morphology on the Performance of Glass Particle-Based Battery Separators

Title data

Rank, Philipp ; Müllner, Sebastian ; Gerdes, Thorsten ; Roth, Christina:
Influence of Particle Size and Morphology on the Performance of Glass Particle-Based Battery Separators.
Authorea , 2025
DOI: https://doi.org/10.22541/au.174343880.08999503/v1

Project information

Project title:
Project's official title
Project's id
GlasSeLIB
AZ-1463-20

Project financing: Bayerische Forschungsstiftung
Bavarian Center for Battery Technology

Abstract in another language

A common methodology to modify both the thermal characteristics and surface properties of battery separators is the incorporation of particles. At present, the particles employed are predominantly of an arbitrary shape. The enhanced mechanical stability of particle layers comprising platelet-shaped particles is demonstrated and further evaluated on the influence of their aspect ratio (edge length to thickness) on the electrochemical properties of battery separators. Glass is selected as the particle material due to its temperature stability and the freedom of design that it offers when particles are formed directly from the melt. A parametric study of glass particle layers as function of edge length and thickness is conducted. Depending on the electrochemical characterization method, symmetrical cells with stainless steel electrodes and graphite-lithium half cells are used. Particles with an excessively high aspect ratio impede the Li+ diffusion pathway, thereby negatively affecting the performance and stability of the cell. Conversely, if the aspect ratio is insufficient, a deterioration in cell performance can be observed, particularly at elevated C-rates, due to the high specific surface area of the particles. An optimum performance can be achieved by utilizing particles with an aspect ratio of about 10 and a thickness of around 1 µm.

Further data

Item Type: Preprint, postprint
Keywords: Lithium-ion Batteries; Separator; Inorganic; Safety
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering > Chair Electrochemical Process Engineering - Univ.-Prof. Dr.-Ing. Christina Roth
Research Institutions > Research Units > Keylab Glass Technology
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 11 Apr 2025 05:17
Last Modified: 11 Apr 2025 05:17
URI: https://eref.uni-bayreuth.de/id/eprint/93284