Composite cathodic electrode
First Claim
1. An electrode product comprising a substantially unitary, microporous structure having a first and a second major surface and a thickness of less than about 50 mils, each of said first and second major surface and a thickness adjacent to each major surface composed of a substantially homogeneous outer composition of from about 7 to 35 weight percent of a polyolefin having a weight average molecular weight of at least about 100,000, from about 50 to 93 weight percent of an inert filler having a mean particle size of from about 0.01 to 10 microns and from 0 to about 15 weight percent of an organic plasticizer for said polyolefin, each of the first and second major surface outer composition being separated by a thickness composed of a substantially homogeneous core composition of from about 2-30 weight percent polyethylene of a weight average molecular weight of at least about 150,000, from 70-98 weight percent of electrically conductive and electrochemically active particulate material and from 0 to about 5 weight percent of an organic plasticizer for said polyethylene and a current collector of electronically conductive material in contact with said particulate material.
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Accused Products
Abstract
A cathodic electrode product comprising a substantially unitary, microporous structure wherein each major surface of said structure is a composition of an inert filler in a polyolefin matrix, the inner core of said structure is a composition of from 70-98 weight percent of electrochemically active and electrically conductive particulate material, from 2-30 weight percent polyethylene and from 0 to 5 weight percent polyethylene plasticizer and a current collector in contact and extend from the inner core composition.
81 Citations
20 Claims
- 1. An electrode product comprising a substantially unitary, microporous structure having a first and a second major surface and a thickness of less than about 50 mils, each of said first and second major surface and a thickness adjacent to each major surface composed of a substantially homogeneous outer composition of from about 7 to 35 weight percent of a polyolefin having a weight average molecular weight of at least about 100,000, from about 50 to 93 weight percent of an inert filler having a mean particle size of from about 0.01 to 10 microns and from 0 to about 15 weight percent of an organic plasticizer for said polyolefin, each of the first and second major surface outer composition being separated by a thickness composed of a substantially homogeneous core composition of from about 2-30 weight percent polyethylene of a weight average molecular weight of at least about 150,000, from 70-98 weight percent of electrically conductive and electrochemically active particulate material and from 0 to about 5 weight percent of an organic plasticizer for said polyethylene and a current collector of electronically conductive material in contact with said particulate material.
- 17. An electrode product comprising a substantially unitary, microporous structure having a first and a second major surface and a thickness of less than about 50 mils said first major surface and adjacent thickness composed of a substantially homogeneous composition of from about 2-30 weight percent polyethylene having a weight average molecular weight of at least about 150,000, from 70-98 weight percent of electrically conductive and electrochemically active particulate material and from 0 to about 5 weight percent of an organic plasticizer for said polyethylene, and said second major surface and adjacent thickness composed of from about 7 to 35 weight percent of a polyolefin having a weight average molecular weight of at least 100,000, from 50-93 weight percent of an inert filler having a mean particle size of less than about 0.01 to 10 microns and from 0-15 weight percent of an organic plasticizer for said polyolefin.
Specification