Flexible carbon fiber electrode with low modulus and high electrical conductivity, battery employing the carbon fiber electrode, and method of manufacture
First Claim
1. An electrically conductive carbon article for an electrode, wherein said article is derived from a stabilized polymeric precursor material, said carbon article being flexible and having a Young'"'"'s modulus of less than 1 MM psi.
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Abstract
A novel flexible carbon article for an electrode is disclosed for use in an electrical storage device in which the flexible carbon article, such as a planar sheet of a plurality of substantially parallel fibers or ribbons, and in which the fibers or ribbons have a Young'"'"'s modulus of less than 1 MM psi (6.89 Gpa). The invention also resides in an electrical energy storage device, such as a secondary battery, comprising a water impermeable housing having at least one and preferably more than two cells in series, wherein a battery containing at least two cells also contains at least one shared bipolar electrode made of the flexible carbon article. Each cell has a foraminous separator between each pair of electrodes and contains an electrolyte comprising an ionizable salt in a non-aqueous fluid. Also disclosed are methods of making the electrode from an unfiltered precursor polymer and from a sub-acrylic polymer.
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Citations
27 Claims
- 1. An electrically conductive carbon article for an electrode, wherein said article is derived from a stabilized polymeric precursor material, said carbon article being flexible and having a Young'"'"'s modulus of less than 1 MM psi.
- 11. A secondary energy storage device comprising a housing which is liquid water and water vapor impervious, said housing having an interior chamber forming a cell, a pair of electrodes positioned in said chamber, wherein said electrodes are electrically insulated or isolated from each other, each electrode having a current collector associated therewith, and each electrode being electrically connected to an exterior of the housing, wherein at least a positive electrode comprises an electrically conductive carbon article that is flexible and has a Young'"'"'s modulus of less than 1 million (MM) psi (6.89 GPa), and an electrolyte in said cell comprising an ionizable salt in a non-aqueous liquid or paste.
- 26. A bipolar secondary energy storage device comprising a gas and water vapor impervious housing, said housing forming a chamber an interior surface of which is electrically non-conductive, at least one electrically insulating separator wall for separating the chamber into at least a pair of terminal cells, each terminal cell containing a terminal electrode which is provided with a current collector, and each said terminal electrode being electrically connected to a terminal on the exterior of the housing to facilitate the flow of stored energy out of and the charge of energy into the storage device, a bipolar electrode extending from one terminal cell into the adjacent terminal cell and forming counter electrodes with each said terminal electrode, wherein said terminal electrodes and said counterelectrodes in each cell are electrically isolated or insulated from each other, said bipolar electrode being formed of an electrically conductive carbon article that is flexible and has a Young'"'"'s modulus of less than 1 MM psi (6.89 GPa), and an electrolyte in each cell comprising an ionizable salt in a non-aqueous liquid or paste.
Specification