Electrically conductive, freestanding microporous polymer sheet
First Claim
1. A freestanding, electrically conductive polymer web, comprising:
- an extruded polymer matrix binding a material composition having electrical conductivity properties, the polymer matrix including an ultrahigh molecular weight polyolefin of a molecular weight that provides sufficient molecular chain entanglement to form a microporous web having freestanding characteristics and having pores encompassing a volume fraction of between about 0.20 and about 0.8.
2 Assignments
0 Petitions
Accused Products
Abstract
A freestanding, microporous polymer sheet (52, 56) is composed of a polymer matrix binding and electrically conductive matrix. The polymer matrix preferably includes UHMWPE, and the electrically conductive matrix preferably is in powder form. The UHMWPE is of a molecular weight that provides sufficient molecular chain entanglement to form a sheet, with freestanding characteristics. Multiple microporous sheets (30) can be wound or stacked in a package filled with an electrolyte to function as electrodes in an energy storage device (86), such as a battery. Metallic layers (81, 83) can be applied to the microporous sheets to function as current collectors in such devices.
-
Citations
18 Claims
-
1. A freestanding, electrically conductive polymer web, comprising:
an extruded polymer matrix binding a material composition having electrical conductivity properties, the polymer matrix including an ultrahigh molecular weight polyolefin of a molecular weight that provides sufficient molecular chain entanglement to form a microporous web having freestanding characteristics and having pores encompassing a volume fraction of between about 0.20 and about 0.8. - View Dependent Claims (2, 3, 4, 5, 6, 18)
-
7. In an energy storage device of a type having multiple electrodes and wound or stacked in a package filled with an electrolyte, the improvement comprising:
a microporous web having freestanding characteristics and including an extruded polymer matrix binding a material composition having electrical conductivity properties, the polymer matrix including an ultrahigh molecular weight polyolefin in an amount and of a molecular weight that provide sufficient molecular chain entanglement to form an electrode. - View Dependent Claims (8, 9, 10, 11, 12, 13)
-
14. An electrode assembly formed as a multi-layer web, comprising:
-
a microporous separator layer positioned between and coherently bonded to a microporous anode layer and a microporous cathode layer;
the microporous separator layer formed as an extruded web from an ultrahigh molecular weight polyolefin; and
each of the microporous anode layer and microporous cathode layer formed as an extruded web from a mixture of an ultrahigh molecular weight polyolefin and a material composition having electrical conductivity properties. - View Dependent Claims (15, 16, 17)
-
Specification