Battery separators with improved resistance to KOH degradation

Battery separator composites were made by coating nonwovens with regenerated cellulose from the viscose process. The composite samples were stored at room temperature for 90 days in 40% potassium hydroxide (KOH). The tensile strength of the samples was measured over time to check the rate of degradation of the separator composites. The data show that a composite made using a polyamide nonwoven retained all of its tensile strength. In addition, the polyamide composite experienced no swelling while in storage. Composites made in this manner would last longer in a battery and would allow for more room in the battery for anode and cathode materials since the composite does not swell