4.5 Article

Flexible, Heat-Resistant, and Flame-Retardant Glass Fiber Nonwoven/Glass Platelet Composite Separator for Lithium-Ion Batteries

Journal

ENERGIES
Volume 11, Issue 4, Pages -

Publisher

MDPI
DOI: 10.3390/en11040999

Keywords

glass platelets; composite separator; high-temperature stability; full-cell configuration cycling tests; lithium-ion battery

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Funding

  1. BayNW project ACoS [PTJ-1308-0002]
  2. TechnologieAllianzOberfranken (TAO)
  3. German Research Foundation (DFG)
  4. University of Bayreuth

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A new type of high-temperature stable and self-supporting composite separator for lithium-ion batteries was 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 were investigated and compared to commercial polymer-based separators. Full-cell configuration cycling tests at different current rates were performed using graphite and lithium iron phosphate as electrode materials. The glass separator was high-temperature tested and showed a stability up to at least 600 degrees C without significant shrinking. Furthermore, it showed an exceptional wettability for non-aqueous electrolytes. The electrochemical performance was excellent compared to commercially available polymer-based separators. The results clearly show that glass platelets integrated into a glass fiber nonwoven performs remarkably well as a separator material in lithium-ion batteries and show high-temperature stability.

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