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Battery separator

A carrier resin, fiber sheet technology, applied in the field of porous pads

Active Publication Date: 2012-05-16
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current technology for making gas diffusion layers for fuel cell applications is very feasible, there is still a need for improvements in properties and costs

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0069] Example 1: Extruded micro and nanofibers of low molecular weight polyethylene.

[0070] Polyethylene powder (7,700Mn, 35,000Mw, Aldrich catalog number 47799-1KG, 1 g) was mixed with poly(2-ethyl-2- Oxazoline) (50,000 Mw, Aldrich 372846-500G, 9 grams) was blended in a Waring blender. The powder was brushed into the hopper of a laboratory mixing extruder (Dynisco, LME) operating at a head and rotor set temperature of 140°C, with the drive motor operating at 50% capacity. The extrudate was drawn at 1 ft / sec and wound onto a Dynisco Take-Up System (TUS). The resulting extruded strands ( Figure 4A ) suspended in three glasses of water. poly(2-ethyl-2- oxazoline) were dissolved from polyethylene nano- and microfibers with widths ranging from 500 nm to 10 microns and undetermined lengths (but typically greater than 1 mm in length). The fibers were isolated by filtration, washed with water, filtered, and suspended in isopropanol. Figure 4BAn image of the fiber is prov...

Embodiment 2

[0073] Example 2: Extruded polyethylene micro and nanofibers

[0074] The resulting material (1 gram) was mixed with poly(2-ethyl -2- oxazoline) (9 g) were combined and extruded to obtain nano and micro fibers. The processing conditions and properties of the nano and micro fibers are described in Table 1.

[0075] Can be combined with poly(2-ethyl-2- oxazoline) to process higher performance polymers into ultrafine fibers. Processable polymers include polyethylene, polypropylene, polylactide, polyolefin, polycycloolefin, polyester, polycaprolactone, polyperfluorocyclobutane, polyamide and other extrudable polymers.

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Abstract

Resinous fibers of nanometer to micrometer width dimensions are drawn from a multi-component system by a melt extrusion process. The process includes a step of combining a fiber resin with a water-soluble carrier resin to form a resinous mixture. The resinous mixture is extruded to form an extruded resinous mixture, the extruded resinous mixture having strands of the fiber resin with the carrier resin. The extruded resinous mixture is then contacted with water to separate the strands of the fiber resin from the carrier resin. A fibrous sheet is then formed from the strands of fiber resin. The fibrous sheets are useful in filtration, as battery separators in Li ion batteries and as diffusion layers in fuel cells.

Description

technical field [0001] The present invention relates to porous mats useful for filtration and as separators for battery and fuel cell applications. Background technique [0002] High-quality porous mats are used in filtration and in many electronic devices such as batteries and fuel cells. In such devices, the porous pad is advantageously permeable to the passage of gas or components dissolved in the liquid. Porous mats are made from microfibers, nanofibers and microporous membranes. Fibers of these dimensions are prepared by electrospinning in the case of solvent soluble polymers. However, polyolefins are difficult to form into solutions without maintaining high temperatures in high-boiling solvents. Cellular polyolefins are prepared by biaxially stretching films or sheets of these plastic polymers. Alternatively, porogens are added to the polyolefin sheet during manufacture and then extracted with a solvent or removed by heating. In the case of solvent soluble olefins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/00H01M2/16H01M50/414H01M50/489
CPCY02E60/122H01M2/1653H01M10/0525H01M8/0243Y02E60/50Y10T29/49108Y02E60/10H01M50/489H01M50/414
Inventor T.J.富勒J.米切尔
Owner GM GLOBAL TECH OPERATIONS LLC
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