Release Time:2019-11-04  Hits:

Indexed by: Journal Papers

Date of Publication: 2019-10-01

Journal: POLYMER BULLETIN

Included Journals: SCIE、EI

Volume: 76

Issue: 10

Page Number: 5451-5462

ISSN: 0170-0839

Key Words: Lithium-ion battery; Separator; Electrospinning; PPESK; Mechanical strength

Abstract: The electrospun fibrous membranes used as lithium-ion battery separators have been widely studied due to the advantages of high porosity, large specific surface area and adjustable structural characteristics. In order to obtain thermal stable and high-strength electrospun fibrous membranes for lithium-ion battery separators, the oriented poly(phthalazinone ether sulfone ketone) (PPESK) fibrous membranes were fabricated and then hot pressed with two pieces of membranes overlaid perpendicularly. The prepared hot-pressed composite oriented PPESK membranes show high tensile strength of 22.8 MPa at both horizontal and vertical directions. The hot-pressed oriented PPESK membranes are thermally dimensional stable even at the high temperature of 200 degrees C. In addition, the novel PPESK fibrous membranes exhibit high porosity (70%), superior electrolyte uptake (525%), low interfacial resistance (268 ohm) with electrodes and excellent ionic conductivity (1.39 mS cm(-1)). The simulated cells using the new separators show high discharge capacity and excellent rate capability, which demonstrates the novel membranes have potential to be used as separators for power lithium-ion batteries.