Heat resisting ultrafine fibrous separator and secondary battery using the same

摘要

A heat-resisting ultrafine fibrous separator of the present invention is prepared by an electrospinning process, formed of ultrafine fibers of heat-resisting polymer resin having a melting point more than 1800 C or not having the melting point, or ultrafine fibers of polymer resin capable of swelling in an electrolyte, together with the ultrafine fibers of heat-resisting polymer resin. Also, polyolefine fine particles providing a shutdown function are dispersed in the heat-resisting resin or the polymer resin capable of swelling in the electrolyte. The heat-resisting ultrafine fibrous separator of the present invention has the shutdown function, low thermal contraction, thermal endurance, excellent ionic conductivity and excellent adhesive property with an electrode, so a battery having excellent cycling characteristics, and having high-energy density and high capacity can be prepared.

主权项

1. A heat-resistant, ultrafine fibrous separator configured for use as a separator in an electrochemical battery or a capacitor, comprising:
a first fibrous phase comprising fibers that comprise a first polymeric material having a melting point of more than 180° C. or not having a melting point; and a second fibrous phase comprising a second polymeric material that is free of electrolyte, said second polymeric material swelling in electrolyte.