Abstract
It is widely said that the non-woven fabric has a large pore diameter and hard to be applied as a separator for lithium ion batteries. In this study, we actually made some battery cells using non-woven fabric and conducted a confirmation test on the occurrence of defects. A hand-made PET non-woven fabric and a cellulose non-woven fabric were used for the test as a Lithium ion battery separator. A commercially available polyolefin microporous membrane and a developed microporous membrane with cellulose nanofiber （FIBLIC） were evaluated for comparison. As a result, in the PET non-woven fabric, a decrease in discharge/charge efficiency, which is guessed to be poor electrical insulation property, was observed in the initial aging process. No problem occurred in the aging process for the cellulose non-woven fabric, but in the 0℃ float test （Charging on Constant Voltage at 4.2 V）, voltage fluctuations that seemed to be a slight short circuit due to dendrite formation were observed. The developed microporous membrane with cellulose nanofiber did not show any problems as in the polyolefin microporous membrane.
