Electrospinning: a fascinating fiber fabrication technique.

Electrolytes and interphases in Li-ion batteries and beyond.

Processing technologies for poly(lactic acid)

Progress in the production and modification of PVDF membranes

Electrospinning is a process by which polymer nanofibers (with diameter lower than 100 nm and lengths up to kilometres) can be produced using an electrostatically driven jet of polymer solution (or polymer melt). Simple alignment of electrospun nanofibers constructs unique functional nanostructures such as nanotubes and nanowires. Significant progress has been made in this area throughout the past few years and this technology has been exploited to a wide range of applications. Most of the recent work on electrospinning has focused either on trying to understand deeper the fundamental aspects of the process in order to gain control of nanofiber morphology, structure, surface functionality, and strategies for assembling them or on determining appropriate conditions for electrospinning of various polymers and biopolymers.

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Polymer nanofibers assembled by electrospinning

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An Electrospun Poly(vinylidene fluoride) Nanofibrous Membrane and Its Battery Applications

Electrospun PVdF-based fibrous polymer electrolytes for lithium ion polymer batteries

The present invention relates to an apparatus of polymer web by electrospinning process and manufacturing method thereof, which can manufacture porous polymer web using an electrospinning method. The method for manufacturing porous polymer web by electrospinning process includes the steps of: forming, pressurizing and supplying at least one or more kinds of polymer materials in a liquid state; and discharging and piling the polymer materials to a collector through one or more charged nozzles, the collector being located under the nozzles and charged to have a polarity opposed to the polarity of the charged nozzles, the collector moving in a prescribed speed.

Apparatus of polymer web by electrospinning process

Microporous fibrous polymer electrolytes were prepared by immersing electrospun poly(acrylonitrile) (PAN)-based fibrous membranes into lithium salt-based electrolytes. They showed high ionic conductivities of up to 1.0 X 10 - 3 S/cm at 20°C, and sufficient electrochemical stabilities of up to 4.5 V. Their ion conduction depended on the physicochemical properties of the lithium salt-based electrolytes trapped in pores, as well as on the interactions among the Li + ion, the carbonate, and the PAN. From the Fourier transform-Raman data, lithium ion transport was mainly achieved by the lithium salt-based electrolytes in pores via the interaction between the Li + ion and the C=O group of carbonate molecules, and was also affected by the PAN through the interaction between the Li + ion and the C≡N groups of PAN. Their electrochemical stabilities were enhanced by the swelling of the electrospun PAN nanofibers because of the dipolar interaction between the C≡N groups of PAN and the C=O groups of carbonate in the lithium salt-based electrolytes. Prototype cells using electrospun PAN-based fibrous polymer electrolytes thus showed different cyclic performances, according to the composition of the lithium salt-based electrolytes. The prototype cell with 1 M LiPF 6 -ethylene carbonate/dimethyl carbonate (1/1) showed the highest discharge capacity and the most stable cyclic performance among them.

https://iopscience.iop.org/article/10.1149/1.1887166/pdf

Electrochemical and Spectroscopic Properties of Electrospun PAN-Based Fibrous Polymer Electrolytes

Disclosed is a method for preparing a thin fiber-structured polymer web suitable for a high-speed and large-scale production using electrospinning. The method uses an electrospinning process to spin a solution containing a polymer in a volatile solvent to obtain a thin fiber-structured polymer web on a collector, in which case the temperature of the polymer solution is in the range of from 40° C. to the boiling point of the solvent. The porous, thin fiber-structured polymer web thus obtained is applicable to the isolation layer or the electrolytic layer for lithium-ion secondary battery, lithium-metal secondary battery or sulfur-based secondary battery, the isolation layer for fuel cells, filter, and so forth.

Wha Seop Lee

Papers

An Electrospun Poly(vinylidene fluoride) Nanofibrous Membrane and Its Battery Applications

Electrospun PVdF-based fibrous polymer electrolytes for lithium ion polymer batteries

Apparatus of polymer web by electrospinning process

Electrochemical and Spectroscopic Properties of Electrospun PAN-Based Fibrous Polymer Electrolytes

Method for preparing thin fiber-structured polymer web