Electrode-separator integral segment for a lithium ion battery

摘要

A method of making a separator for an electrochemical battery cell of a lithium ion battery includes electrospinning a non-woven polymer fiber mat onto a collection face of a collector substrate. The separator may be formed entirely of the electrospun non-woven polymer fiber mat or it may be a multi-layer composite that contains other components in addition to the electrospun non-woven polymer fiber mat. The collector substrate comprises an electrode (positive or negative) optionally covered with a ceramic particle layer such that electrospinning of the non-woven polymer fiber mat forms an electrode-separator integral segment. The electrode-separator integral segment may then be assembled into an electrochemical battery cell of a lithium ion battery.

主权项

1. A method of making a separator that is disposed between a negative electrode and a positive electrode in an electrochemical battery cell of a lithium ion battery, the method comprising:
(a) positioning a collection face of a collector substrate proximate an electrospinning apparatus, the collector substrate comprising an electrode composed as either a positive or a negative electrode for an electrochemical battery cell of a lithium ion battery and a ceramic particle layer overlying the electrode and being exposed at the collection face; and (b) electrospinning a non-woven polymer fiber mat comprised of a fibrous mass of one or more polymer fibers onto the ceramic particle layer at the collection face of the collector substrate to form an electrode-separator integral segment, the non-woven polymer fiber mat having a thickness that ranges from about 5 μm to about 50 μm.