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DOE OSTI · 1720237

Homogeneous titanium hydroxide yields hydroxyl decorated nanofiber separator with improved electrolyte uptake and device capacitance

Dwyer, Derek B.·E. Mera, Edison·Gudavalli, Ganesh S.·Bernier, William E.·Dhakal, Tara P.·Jones, Wayne E.
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Abstract

Good wettability of separators in batteries and capacitors is crucial for performance. Titanium hydroxide (Ti(OH) x ) has been shown to greatly improve the wettability of polyvinylidene fluoride (PVDF) nanofibers (NFs). Here, PVDF/Ti(OH) x NFs were evaluated for their potential use as separators. Results show that PVDF NFs incorporated with Ti(OH) x have improved electrolyte uptake (EU) between 550 and 1200 EU% compared to untreated PVDF with less than 100 EU%. Significant improvements in capacitance are seen from capacitors utilizing PVDF/Ti(OH) x NF separators with the best performing PVDF/Ti(OH) x NF at 15 wt% Ti(OH)x with 446.8 mF/cm 2 compared to untreated PVDF NF separator with 262.7 mF/cm 2 .

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36 MATERIALS SCIENCECapacitorCompositeElectrolyte UptakeNanofibersSeparatorTitanium

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Dwyer, Derek B., E. Mera, Edison, Gudavalli, Ganesh S., Bernier, William E., Dhakal, Tara P., Jones, Wayne E.. 2020-11-12. Homogeneous titanium hydroxide yields hydroxyl decorated nanofiber separator with improved electrolyte uptake and device capacitance. https://doi.org/10.1016/j.matlet.2020.129023

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