Electrospun PI/PVdF composite fibrous membranes with high heat resistance for lithium ion batteries of electric vehicles

Title
Electrospun PI/PVdF composite fibrous membranes with high heat resistance for lithium ion batteries of electric vehicles
Authors
손정우장성연박철민김동영조성무
Keywords
electrospinning; nanofiber; separator
Issue Date
2010-09
Publisher
61th annual meeting of International Society of Electrochemistry
Abstract
High heat-resistive nanofibrous membrane as new separator of future lithium ion battery was prepared by electrospinning of PVdF and Polyimide(PI) mixture solution. We prepared PI/PVdF composite nanofibrous membrane with tensile strength of 32 MPa, and modulus of 700 MPa through post-process such as hot-pressing and stretching. The internal structure of the electrospun PVdF/PI composite nanofiber with a diameter of few hundreds nanometer were composed of a bundle of PI nanofiber with a diameter of few tens nanometer, which resulted from microphase separation and highly stretching of PI micro-domain during electrospinning, as shown in Figure 1. Electrospun PI/PVdF composite nanofibrous membranes show high ionic conductivity of 1.3× 10-3 S/cm at room temperature and sufficient electrochemical stability windows above 4.5 V ver. Li+/Li. From thermal stability tests, PE separator was melted above 130oC, but PI/PVdF blend membranes show good dimensional stability at above 200 oC. It indicates the membrane will still retain the mechanical integrity of membrane even after meltdown at high temperature. Also, the prototype cells with electrospun PI/PVdF composite membrane have good long term cycle performance over 500 cycles compared with PE separator at 1C rate. So we expect the possibility of this type membrane as new separator of Li-ion battery for HEV.
URI
http://pubs.kist.re.kr/handle/201004/38690
Appears in Collections:
KIST Publication > Conference Paper
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