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Schadeck, Ulrich ; Gerdes, Thorsten ; Krenkel, Walter ; Moos, Ralf:
Electrochemically active glass separators for lithium-ion batteries.
2019
Veranstaltung: Advanced Functional Materials Spectroscopy and Electrochemistry Congress
, March 24-27, 2019
, Stockholm, Sweden.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Vortrag
)
Abstract
Lithium-ion batteries are an integral part of today's society. They are used in almost any mobile electrical device, since they have higher energy densities and a more efficient cyclic stability than other battery types such as lead-acid or nickelcadmium batteries. Therefore, Lithium-ion batteries have become the standard choice of power sources for electric vehicles. This results in enhanced safety requirements. To replace todays used electrochemically passive polymer-based battery separators with poor stability to high temperatures, a novel high-temperature stable and self-supporting composite separator for lithium-ion batteries is developed consisting of custom-made ultrathin micrometer-sized sodium borosilicate glass platelets embedded in a glass fiber nonwoven together with a water-based binder. The presented separator is electrochemically active, whereas ions from the glass platelets are provided during progressing cycling, behave like an electrolyte additive, and improve the battery performance. For comparison, glass platelets with alternative compositions are investigated. The glass separators are tested in a graphite/lithium iron phosphate full-cell configuration. Charge/discharge tests at different current rates up to a 10C-rate, post-mortem analysis, impedance measurements and electric analysis methods are used to interpret the specific influence of glass on cell aging.