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Release system for electrochemical cells

a technology of electrochemical cells and release systems, which is applied in the field of electrochemical cells, can solve the problems of little or no function of electrochemical cells, and inability to achieve significant improvement of performan

Inactive Publication Date: 2011-03-24
SION POWER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0011]Other advantages and novel features of the present invention will become apparent from the following detailed description of various non-limiting embodiments of the invention when considered in conjunction with the accompanying figures. In cases where the present specification and a document incorporated by reference include conflicting and/or inconsistent

Problems solved by technology

Some such substrates, however, may have little or no function in the electrochemical cell; therefore, their incorporation into the cell adds additional weight but does not substantially increase performance.

Method used

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  • Release system for electrochemical cells
  • Release system for electrochemical cells
  • Release system for electrochemical cells

Examples

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example 1

[0148]This example describes a process for forming a release layer, and a process for fabricating an anode of an electrochemical cell using the release layer.

[0149]In a 5 L 3-necked flask equipped with a mechanical stirrer, condenser, and a thermometer, 28.3% by weight isopropyl alcohol (IPA) was added and stirred at room temperature. To this, 5.5% by weight of Celvol 425 (from Celanese Corp.) polyvinyl alcohol (PVOH) was added, with continued stirring. To this suspension, 66.2% by weight distilled water was added. The resulting suspension was heated to a temperature between 65° C. to 75° C. until all PVOH pellets were dissolved completely. The suspension was stirred continuously for an additional hour at this temperature. The stiffing solution was allowed to cool to room temperature slowly. Once cooled, the PVOH formulation was tested for percent solids, density, and viscosity. The cooled PVOH formulation was then filtered into a secondary container to remove any particulate contam...

example 2

[0156]This example describes a process for forming a release layer, and a process for fabricating an anode of an electrochemical cell using the release layer.

[0157]In a 5 L 3-necked flask equipped with a mechanical stirrer, condenser, and a thermometer, 27.7 wt % isopropyl alcohol (IPA) was added and stirred at room temperature. To this solution was added 7.5% by weight of Celvol 310 (from Celanese Corp.) polyvinyl alcohol (PVOH) with continued stirring. To this suspension, 64.8 wt % distilled water was added. The suspension was heated until it reached a temperature of between 65° C. and 75° C., and until all PVOH pellets had dissolved completely. The solution was stirred continuously for an additional hour at this temperature. The stirring solution was allowed to cool to room temperature slowly. Once cooled, the release formulation was tested for percent solids, density, and viscosity. The cooled formulation was then filtered into a secondary container to remove any particulate con...

example 3

[0164]This example describes a process for forming a release layer, and a process for fabricating an anode of an electrochemical cell using the release layer.

[0165]In a 5 L flask equipped with a mechanical stirrer and a thermometer, 74.8 wt % distilled water was added and stirred at room temperature. To this solution was added 6.5% by weight of Celvol 425 PVOH (from Celanese Corp.) with continued stiffing. The suspension was heated to a temperature between 90° C. and 95° C. until all PVOH pellets had dissolved completely. The solution was stirred continuously at this temperature for an additional hour. The stiffing solution was allowed to cool to room temperature slowly under agitation. To this suspension was added 18.7 wt % IPA slowly under agitation. The cooled formulation was then filtered into a secondary container to remove any particulate contaminants. Once cooled, the PVOH solution was tested for percent solids, density, and viscosity. The resulting mixture was coated onto 76...

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Abstract

Electrochemical cells, and more specifically, release systems for the fabrication of electrochemical cells are described. In particular, release layer arrangements, assemblies, methods and compositions that facilitate the fabrication of electrochemical cell components, such as electrodes, are presented. In some embodiments, methods of fabricating an electrode involve the use of a release layer to separate portions of the electrode from a carrier substrate on which the electrode was fabricated. For example, an intermediate electrode assembly may include, in sequence, an electroactive material layer, a current collector layer, a release layer, and a carrier substrate. The carrier substrate can facilitate handling of the electrode during fabrication and / or assembly, but may be released from the electrode prior to commercial use.

Description

RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application No. 61 / 236,322, filed Aug. 24, 2009, and entitled “Release System for Electrochemical Cells,” which is incorporated herein by reference in its entirety for all purposes.FIELD OF INVENTION[0002]The present invention relates generally to electrochemical cells, and more specifically, to release systems for electrochemical cells.BACKGROUND[0003]A typical electrochemical cell includes a cathode and an anode which participate in an electrochemical reaction. To fabricate an electrode, an electroactive material may be deposited onto a component of the electrochemical cell such as a current collector. In turn, the current collector may be supported by a substrate that has suitable physical and chemical properties (e.g., a substantial thickness) that allow it to be compatible with the processes required to form the electrode. Some such substrates, however, may have little ...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B11/00B32B38/10B32B38/00
CPCH01M4/13H01M4/667H01M10/052Y02E60/122B32B37/12B32B2037/246B32B2038/168B32B2310/0806H01M4/0404H01M4/134H01M4/1395H01M4/382H01M4/662B32B2307/748B32B2457/10H01M4/139Y02E60/10H01M4/02H01M10/0525
Inventor AFFINITO, JOHN D.MARTENS, JOHN A.XIAO, ANGCAMPBELL, CHRISTOPHER T.S.MIKHAYLIK, YURIY V.KOVALEV, IGORBULLDIS, ASHLEY H.XU, ZHESHENG
Owner SION POWER CORP
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