Oriented PAN/PVDF/PAN laminated nanofiber separator for lithium-ion batteries

Abstract

Electrospun nanofiber separators have excellent properties in terms of large surface area and high porosity, which benefits the rate capability, electrochemical stability, and safety performance of lithium-ion batteries. Herein, a 0°PAN/PVDF/90°PAN-oriented composite nanofiber separator is prepared, which is prepared layer by layer by electrospinning technology and drum orientation collector. The results show that when the rotating speed of the drum is 600 r min−1, the 0°PAN/PVDF/90°PAN-oriented composite nanofiber separator has high porosity (about 85%), improved transverse and longitudinal tensile properties (10.33 MPa and 11.03 MPa, respectively), good dimensional stability at 160°C, and good electrochemical performance (specific charge capacity of 165 mAh g−1 at 0.5C and 142.7 mAh g−1 at 1C, capacity retention of 90% after 100 cycles).

Highly Conductive Yarn Cathode Coated with Polypyrrole as a Flexible Battery for Wearables

“…CFPP, CFPP@MnO 2 , and CFP yarn have some similar characteristic peaks, which indicates that PPy and MnO 2 were successfully synthesized onto the CFP yarn. The 1450.5 cm −1 −CH 2 − bending vibration peak of PAN and the 2243.2 cm −1 −C�N tensile vibration peak can be found in the infrared spectrum of CFP, 26 indicating the success of PAN cored yarn CFs, asymmetric 1544 cm −1 of Py ring can also found in the infrared spectrum of CFPP yarn, symmetric stretching mode (1453 cm −1 ), 27−30 which means PPy successfully loaded on the CFP yarn. While the characteristic tensile vibration peak of the Mn−O bond at 582 cm −1 could be observed on top of the CFPP@MnO 2 yarn cathode infrared spectrum, 31,32 and 723, 501 cm −1 MnO 2 characteristic absorption peaks, illustrating that MnO 2 was coated on the CFPP yarn successfully.…”

Advances in Electrospun Materials and Methods for Li-Ion Batteries

“…Polycaprolactone (PCL) is a biocompatible polymer that can be electro-spun to synthesize the separator; these separators can sustain high discharge current and possess good ionic conductivity; however, the application is limited since the melting point is 60 °C and it cannot impede the formation of lithium dendrites [ 71 ]. A high-performance composite separator was fabricated using a high-speed roller orientation receiving method of electrospinning to obtain an oriented composite of 0°PAN/PVDF/90° PAN directions [ 22 ]. Figure 6 b depicts the constructed triple-layer oriented sandwich composite.…”

“…[ 69 ] 2022, Elsevier) ( b ) Fabrication of directionally oriented composite nanofibers (reused with copyrights from Ref. [ 22 ] 2022, Sage) ( c ) Smart electro-spun nanofibers with core-shell structure (I)-before thermally triggering (II)-after thermally triggering releasing flame retardants that suppress ignition. (reused with copyrights from Ref.…”

“…By making changes to the structure of nanofibers and adjusting the electrospinning process, it is feasible to produce nanofibers with specific properties. In the case of the nanofiber for the electrodes, direction-oriented electrospinning [ 22 , 23 ], in situ electrospinning [ 24 ], hybrid composite using single pot electrospinning, and fork-like electro-spun single crystalline cathodes [ 25 ] have been reported previously [ 21 , 22 , 23 , 24 ]. Nanofibers designed for use as battery separators can be produced more efficiently using a syringeless technique, which yields beadles fiber.…”

Dielectric Characterization of Al/PAN/n˗Si/Al Structure as a Function of Frequency and Voltage

“…13 PAN fibers have a high melting point (317 °C-322 °C) and a high degree of molecular orientation as well as non˗toxic and ecofriendly. 14 Due to these features, it is used as a yarn in textile industry, as a membrane in water purification 15,16 and biomedical aplications, 17,18 a separator in Li˗ion batteries, 19,20 a carbon precursor in supercapacitors, 21,22 and a matrix in flexible electronics 23,24 and, electrochromic applications. 25,26 Considering these wide˗scale application areas of PAN, in this study, it was investigated whether PAN could be used as an interfacial layer in Schottky type structures.…”