Electrospun PI/PVdF composite fibrous membranes with high heat resistance for lithium ion batteries of electric vehicles
- Electrospun PI/PVdF composite fibrous membranes with high heat resistance for lithium ion batteries of electric vehicles
- 손정우; 장성연; 박철민; 김동영; 조성무
- electrospinning; nanofiber; separator
- Issue Date
- 61th annual meeting of International Society of Electrochemistry
- 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
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.
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