电池用纤维素类隔离膜的开发

摘要

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 ifber and PET ifber were available for making such a good separator. In the next study, we found that the nonwoven separator with cellulose ifber had a superior performance to iflm type separator in heat resistance, and the mixture of cellulose ifber and PET ifber made it possible to provide the excellent nonwoven separator with higher wet strength and lower moisture afifnity.%锂离子电池被认为是众多电子设备中最有前景的高能存储装置，同时，希望进一步提高锂离子电池的安全性和电池性能。该研发的锂离子的无纺型电池隔离膜，是由纤维素和PET两种纤维混合制成，可满足对电池的高性能和安全方面的要求。在初始的研究中，调研了无纺布电池隔离膜的纤维材料怎样影响锂离子电池的性能。发现电池隔离膜的孔隙率和电池性能之间是有良好对应关系。具有高空隙率无纺布基材是用于锂离子电池隔离膜的最佳纤维材料。纤维素纤维和PET纤维适合于制造这样优质的电池隔离膜。在后续的研究中发现：纤维素纤维无纺布隔离膜在薄膜型电池隔离膜中耐热性优越；纤维素纤维和PET纤维混合隔离膜，有较高的湿强度和较低的亲水性。