A high-strength electrospun PPESK fibrous membrane for lithium-ion battery separator
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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 °C. In addition, the novel PPESK fibrous membranes exhibit high porosity (70%), superior electrolyte uptake (525%), low interfacial resistance (268 Ω) 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.
KeywordsLithium-ion battery Separator Electrospinning PPESK Mechanical strength
The authors would like to acknowledge financial support from National Natural Science Foundations of China (11432003), Innovation and Talent Recruitment Base on Numerical Simulation and Optimization of Rubber and Plastic Products Forming (B14013).
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