The Development of Cellulose Fiber Based Nonwoven Type Separator

Abstract

Lithium-ion batteries have been regarded as promising high energy storage devices for many electronic devices. At the same time, more improvement of Lithium-ion batteries is desired in safety and battery performance. We developed the nonwoven separator for lithium-ion batteries made from the mixture of cellulose fiber and PET fiber in order to satisfy the safety and high battery performance.
In the first study, we investigated how the fiber material of nonwoven separator affected on lithium-ion battery performance. There was a good relationship between the porosity of the separator and the battery performance. The nonwoven with a high porosity was a preferable separator for lithium-ion batteries. Cellulose fiber and PET fiber were available for making such a good separator.
In the next study, we found that the nonwoven separator with cellulose fiber had a superior performance to film type separator in heat resistance and the mixture of cellulose fiber and PET fiber made it possible to provide the excellent nonwoven separator with higher wet strength and lower moisture affinity.