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Schadeck, Ulrich ; Kyrgyzbaev, Kanat ; Zettl, Heiko ; Gerdes, Thorsten ; Moos, Ralf:
Flexible, Heat-Resistant and Flame-Retardant Glass Fiber Nonwoven/Glass Platelet Composite-Separator for Lithium-Ion Batteries.
2018
Veranstaltung: The Energy & Materials Research Conference (EMR 2018)
, November 8-9, 2018
, Torremolinos, Spain.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Poster
)
Abstract
A new type of high-temperature stable and self-supporting composite separator for lithium-ion batteries is developed consisting of custom-made ultrathin micrometer-sized glass platelets embedded in a glass fiber nonwoven together with a water-based sodium-alginate binder. The physical and electrochemical properties are investigated and compared to commercial polymer-based separators. Full-cell configuration cycling tests at different current rates are performed using graphite and Lithium iron phosphate as electrode materials. The glass separator is high-temperature tested and shows a stability up to at least 600 °C without significant shrinking. Furthermore, it shows an exceptional wettability for non-aqueous electrolytes. The electrochemical performance is excellent compared to commercially available polymer-based separators. The results clearly show that glass platelets, integrated in a glass fiber nonwoven perform remarkably as a separator material in lithium-ion batteries and show a high temperature stability.