Solid state electrochemical capacitors and their preparation
First Claim
1. A method for making an electrochemical capacitor, comprising the step of:
- assembling a stacked assembly of at least two bipolar electrodes, each of the bipolar electrodes comprising a metal foil electrode substrate having a porous, electronically conductive, substrate coating on each surface, the stacked assembly further including a porous separator layer between each of the electrodes, the separator layer being made of a material that is electronically non-conductive;
providing an ionic conductor electrolyte that wets both the substrate coating and the separator layer at temperatures above the melting point of the solid ionic conductor electrolyte, the ionic conductor electrolyte having a melting point above about 30°
C.; and
introducing the ionic conductor electrolyte into the stacked assembly.
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Abstract
An electrochemical capacitor is prepared by assembling a stacked assembly of at least two bipolar electrodes, where each of the bipolar electrodes includes a metal foil electrode substrate having a porous, electronically conductive substrate coating, preferably porous platinum, on each surface. The stacked assembly further has a porous separator layer between each of the electrodes, made of a material that is electronically non-conductive. An ionic conductor electrolyte, preferably a polyoxometalate, that wets both the substrate coating and the separator layer at temperatures above the melting point of the solid ionic conductor electrolyte is provided, the ionic conductor electrolyte having a melting point above about 30° C. The ionic conductor electrolyte is introduced into the stacked assembly, as by external infiltration with an optional applied pressure to assist the infiltration.
66 Citations
15 Claims
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1. A method for making an electrochemical capacitor, comprising the step of:
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assembling a stacked assembly of at least two bipolar electrodes, each of the bipolar electrodes comprising a metal foil electrode substrate having a porous, electronically conductive, substrate coating on each surface, the stacked assembly further including a porous separator layer between each of the electrodes, the separator layer being made of a material that is electronically non-conductive; providing an ionic conductor electrolyte that wets both the substrate coating and the separator layer at temperatures above the melting point of the solid ionic conductor electrolyte, the ionic conductor electrolyte having a melting point above about 30°
C.; andintroducing the ionic conductor electrolyte into the stacked assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14)
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11. A method for making an electrochemical capacitor, comprising the steps of:
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providing a stacked assembly of at least two bipolar electrodes, each of the bipolar electrodes comprising a metal foil electrode substrate having a porous, electronically conductive substrate coating on each surface, the coating being selected from the group consisting of the platinum-group metals, the stacked assembly further including a porous separator layer between each of the electrodes, the separator layer being made of a material that is electronically non-conductive; supporting the electrodes in a fixture; providing an ionic conductor electrolyte that wets both the substrate coating and the separator layer at temperatures above the melting point of the solid ionic conductor electrolyte, the ionic conductor electrolyte having a melting point above about 30°
C.;melting the solid ionic conductor electrolyte; contacting the melted ionic conductor electrolyte to an edge of the stacked assembly to permit the molten ionic conductor to flow between the electrode of the stacked assembly; and
cooling the stacked assembly in a controlled fashion to produce a laminate structure. - View Dependent Claims (12, 13, 15)
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Specification