Porous and non-porous micrometer-sized glass platelets as separators for lithium-ion batteries

Titelangaben

Schadeck, Ulrich ; Kyrgyzbaev, Kanat ; Gerdes, Thorsten ; Willert-Porada, Monika ; Moos, Ralf:
Porous and non-porous micrometer-sized glass platelets as separators for lithium-ion batteries.
In: Journal of Membrane Science. Bd. 550 (2018) . - S. 518-525.
ISSN 0376-7388
DOI: https://doi.org/10.1016/j.memsci.2017.10.061

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Abstract

Custom-made porous and non-porous micrometer-sized glass platelets made of phase-separating sodium borosilicate glass are used as a new type of separator for lithium-ion batteries with liquid electrolytes as a high-temperature stable alternative for polymer-based separators. The production process of glass platelets as well as the preparation of porous glass platelets by the so-called VYCOR®-process is described. The influence of the platelet morphology on the ionic conductivity in a non-aqueous battery electrolyte is shown. Porous glass platelets with a porosity of 52% show an ionic conductivity of 5.5 mS cm⁻¹ in a standard non-aqueous lithium-ion battery electrolyte. The battery performance of porous and non-porous glass platelets as a separator is tested in a graphite/lithium iron phosphate full-cell configuration and is compared to state-of-the-art polymer-based separators. Charge/discharge tests are performed at different current rates. The results clearly show that glass platelets perform excellently with high charge/discharge currents up to a 10 C rate and capacity retention at a 1 C rate compared to polymer based separators.