Gelled membranes for Li and Li-ion batteries prepared by electrospinning

• Published in: Journal of power sources Vol. 178; no. 2; pp. 848 - 851
• Main Authors: Bansal, D., Meyer, B., Salomon, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 01-04-2008; Elsevier Sequoia
• Subjects: Applied sciences; Batteries; Blends; Direct energy conversion and energy accumulation; Electric fields; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrospinning; Exact sciences and technology; Fibers; Gelled electrolytes; Li-ion; Membranes; Polyimide resins; Polyimides; Polyvinylidene fluorides; Separators; Gelled electrolytes; Electrospinning; Separators; Li-ion; Polyimides; Polyimide; Secondary cell; Solid solution; Lithium battery; Membrane; Manufacturing; Porosity; Strength
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2007.07.070

Composite polymer gelled membranes have been prepared an electrospinning technique. Electrospinning of polymer fibers or electrospraying of particles is typically accomplished by applying a strong electric field (ca. 1–25
kV
cm
−1) to a polymer solution or slurry of solids in an appropriate solvent. The fibers are collected as a mat (membrane) on a grounded target such as Al, Cu, Ni, etc. Typical membranes (mats) consist of nanometer size fibers and have porosities of 65–85%. In the present paper, we describe the fabrication of electrospun membranes for use as gelled electrolytes in Li and Li-ion batteries. The electrospun polymer membranes used in this work are based on the polyimides (PIs) Matrimid and Ultem 1000. Pure PI membranes have been prepared, and blends of Matrimid and Ultem with PVdF-HFP and PAN have been studied in 250
mAh and 7
Ah Li-ion cells. Fully imidized polyimides such as Matrimid and Ultem 1000 do not form gels, and are used as a host matrix of high mechanical strength to immobilize the gelling constituents PVdF or PAN.