Intermittently coated dry electrode for energy storage device and method of manufacturing the same
Methods for manufacturing intermittently coated dry electrodes for energy storage devices and energy storage devices including the intermittently coated dry electrodes are disclosed. In one embodiment, the method includes providing a metal layer and providing an electrochemically active free-standing film formed of a dry active material. The method also includes combining the electrochemically active free-standing film and the metal layer to form a combined layer. The method further includes removing a portion of the electrochemically active free-standing film from the combined layer so that the electrochemically active free-standing film is intermittently formed on the metal layer in a longitudinal direction of the metal layer.
1. A dry electrode for an energy storage device, comprising:
a metal layer; and
an electrochemically active free-standing film formed of a dry active material, wherein the electrochemically active free-standing film comprises a plurality of film portions intermittently formed on the metal layer in a longitudinal direction of the metal layer to expose a portion of the metal layer.
2. The dry electrode of claim 1 , wherein the exposed portion of the metal layer is not coated with an adhesive and extends in a direction crossing the longitudinal direction.
3. The dry electrode of claim 2 , wherein the adhesive comprises a conductive adhesive layer, and wherein a coating weight for the conductive adhesive layer is about 1 gram per square meter per side to about 5 grams per square meter per side with a dry coating density of about 0.2 grams per square centimeter per side to about 1.1 grams per square centimeter per side.
4. The dry electrode of claim 1 , wherein the electrochemically active free-standing film comprises sulfur.
5. The dry electrode of claim 1 , wherein the metal layer comprises first and second surfaces opposing each other, and wherein the electrochemically active free-standing film is disposed on at least one of the first and second surfaces of the metal layer.
6. The dry electrode of claim 5 , wherein the plurality of film portions are equally spaced apart from each other.
7. The dry electrode of claim 1 , wherein the metal layer comprises first and second surfaces opposing each other, and wherein the electrochemically active free-standing film comprises first and second electrochemically active free-standing films respectively disposed on the first and second surfaces of the metal layer.
8. The dry electrode of claim 7 , wherein the first electrochemically active free-standing film comprises a plurality of first film portions spaced apart from each other by a first distance, and wherein the second electrochemically active free-standing film comprises a plurality of second film portions spaced apart from each other by a second distance different from the first distance.
9. An energy storage device, comprising:
a first electrode;
a second electrode; and
a separator interposed between the first and second electrodes,
wherein each of the first and second electrodes comprises the dry electrode of claim 1 .
10. The energy storage device of claim 9 , further comprising an electrode tab attached to the exposed portion of the metal layer.
11. The energy storage device of claim 9 , wherein the energy storage device comprises a battery, a capacitor or a combination thereof.
12. The energy storage device of claim 11 , wherein the battery comprises a lithium ion battery for use with a hybrid vehicle, a plug-in hybrid vehicle or a pure electric vehicle.
13. The energy storage device of claim 9 , wherein the electrochemically active free-standing film comprises sulfur.