# US 9,496,090 B2 · Method of making graphene electrolytic capacitors

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- Number: US 9,496,090 B2
- Document ID: US9496090B2
- Status: Granted
- Kind: B2
- Application number: 14/512,630
- Filed: 2014-10-13
- Published: 2016-09-22
- Granted: 2016-11-15
- Earliest claimed: 2012-10-24
- Assignees: Custom Electronics, Inc.
- Applicants: Custom Electronics, Inc.
- Inventors: Thor E. Eilertsen
- Web page: https://patentgrep.com/patent/US9496090B2

## CPC

- H01G 9/042: characterised by the material (H01G11/22 takes precedence)
- H01G 9/0032: {formation of the dielectric layer}
- H01G 9/0036: {Formation of the solid electrolyte layer}
- H01G 9/02: Diaphragms; Separators
- H01G 9/035: Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence)
- H01G 9/07: Dielectric layers
- H01G 9/145: Liquid electrolytic capacitors (H01G11/00 takes precedence)
- H01G 11/30: characterised by their material
- H01G 11/36: Nanostructures, e.g. nanofibres, nanotubes or fullerenes
- Y02E 60/13: Energy storage using capacitors
- Y10T 29/435: Solid dielectric type
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The disclosure describes an improved electrolytic capacitor, more specifically, a method of making an electrolytic capacitor with a graphene-based energy storage layer and dielectric. The electrode with layered graphene energy storage and dielectric layers may be used in a variety of electrolytic capacitor configurations.

## Claims

### Claim 1

A method of making a capacitor, comprising the steps of:
applying a layered graphene structure to a first current collector to form a first electrode with a dielectric layer, wherein the dielectric layer is formed of at least one film layer of the layered graphene structure;
putting a separator adjacent the dielectric layer of the first electrode;
putting a second electrode adjacent the separator, wherein the first electrode, separator, and second electrode define a layered stack; and
impregnating the layered stack with an electrolyte.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of applying the layered graphene structure includes depositing at least one film layer of single layer graphene substantially parallel to the first current collector to form the dielectric layer with a desired dielectric thickness.

### Claim 3 (depends on 1)

The method of claim 1, wherein the step of applying the layered graphene structure includes putting a graphene energy storage layer between the first current collector and the dielectric layer.

### Claim 4 (depends on 3)

The method of claim 3, wherein the graphene energy storage layer comprises a plurality of graphene platelets configured in sheets and having a desired energy storage thickness.

### Claim 5 (depends on 1)

The method of claim 1, wherein the step of applying the layered graphene structure includes putting a graphene paste conductive coating layer between the current collector and the dielectric layer.

### Claim 6 (depends on 1)

The method of claim 1, further comprising the step of applying a second layered graphene structure to a second current collector to form the second electrode.

### Claim 7 (depends on 1)

The method of claim 1, wherein the step of applying the layered graphene structure includes applying a plurality of film layers containing graphene to the first current collector to form the dielectric layer with a desired dielectric thickness.

### Claim 8 (depends on 7)

The method of claim 7, wherein the plurality of thin film layers each comprise a single layer graphene structure.

### Claim 9 (depends on 7)

The method of claim 7, wherein the capacitor has a voltage specification and the desired dielectric thickness is selected from the range of 1-2 nm/volt of the voltage specification.

### Claim 10 (depends on 1)

The method of claim 1, wherein the first electrode is an anode of the capacitor.

### Claim 11 (depends on 4)

The method of claim 4, wherein the plurality of graphene platelets configured in sheets have a platelet thickness selected from the range of 1-20 nanometers.

### Claim 12 (depends on 4)

The method of claim 4, wherein the plurality of graphene platelets configured in sheets define ion receiving pores selected from the range of 2-7 nanometers.

### Claim 13 (depends on 4)

The method of claim 4, wherein the desired energy storage thickness is selected from the range of 30-60 um.

### Claim 14 (depends on 1)

The method of claim 1, wherein the step of applying the layered graphene structure to the first current collector comprises:
providing the first current collector as a substrate with a first surface;
applying a graphene paste conductive coating layer on the first surface of the first current collector;
applying a graphene energy storage layer to the graphene paste conductive coating layer; and
applying the dielectric layer by disposing at least one graphene film layer on the graphene energy storage layer.