Abstract
Various methods have been used to improve mechanical and thermal performance of electrospun separators in order to implement or scale up their application in batteries. Here a combination of organic & inorganic doping, hot-pressing and coaxial electrospinning technique is employed to develop a [email protected] – PAN/[email protected]/UiO-66 – composite membrane (PAN: polyacrylonitrile, HCNFs: helical carbon nanofibers, PVDF: poly (vinylidene fluoride), UiO-66: a Zr-based Metal-Organic Framework). The [email protected] structure is demonstrated in the electrospun fibers. With the synergetic effect of hot-pressing and the PAN/HCNFs core layer, the fiber membrane can stand tension up to 24.77 MPa. The core layer also helps the electrospun membrane keep intact profile at 200 °C. Besides the HCNFs can support the fibers without serious shape change during the hot-pressing treatment, facilitating retention of high porosity (77.61%). The PVDF/UiO-66 shell layer provides good affinity to electrolyte causing excellent electrochemical performance of lithium ion batteries with the composite membranes.
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