Supercapacitor Electrode Fabrication Using Sacrificial AAO Templates

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Solution Overview

Problem

The development of supercapacitors with nano-sized conductive polymer electrodes faces challenges in achieving a wider surface area and thinner thickness, which are essential for high capacitance, due to difficulties in CNT dispersion and increased resistance during polymerization.

Innovation Solution

A method involving the use of anodized aluminum oxide filters to form a conductive polymer layer with specific plating layers, polymerization, and a supporting layer to create a PPy/Au electrode with a wider surface area and improved mechanical properties, enhancing ion diffusion and capacitance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a nano sized conductive polymer is used as an electrode to increase surface area and improve ion diffusion, then capacitance is improved, but resistance increases during polymerization

Engineering Contradiction:

ImprovecapacitanceVSAvoidresistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A porous template (anodized aluminum oxide membrane) is used as an intermediary structure to guide the formation of the conductive polymer electrode. The template provides a predefined porous architecture that ensures high surface area and good ion diffusion pathways, while the polymerization process occurs within this structured framework, preventing excessive resistance. After polymerization, the template is removed, leaving a free-standing nanostructured electrode with optimized properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrode is formed as a porous structure using anodized aluminum oxide templates with controlled pore sizes and distributions. This porous architecture provides extensive surface area for electrochemical reactions while maintaining short ion diffusion paths. The porosity is carefully controlled to balance surface area maximization with electrical conductivity maintenance, resolving the contradiction between high capacitance and low resistance.

Inventive Principle:

Principle #31Porous materials

2Reliability

If CNT is used to provide wide surface and good porosity for the electrode, then capacitance is improved, but dispersion and electrode fabrication become difficult

Engineering Contradiction:

ImprovecapacitanceVSAvoidelectrode fabrication

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

A disposable porous template (anodized aluminum oxide membrane) is used as a sacrificial structure during fabrication. The template is easily manufactured, provides precise porous architecture, and is removed after use. This approach replaces the difficult-to-handle CNT dispersion process with a simple template-based fabrication method that is easier to manufacture and control, while still achieving high capacitance through the resulting porous electrode structure.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Speed

If the electrode is made thinner to maximize ion diffusion, then ion diffusion is improved, but surface area for electron absorption is reduced

Engineering Contradiction:

Improveion diffusionVSAvoidsurface area

Core Design Contradiction:

SpeedVSArea of moving object

Solution Approach 1:

The electrode structure transitions from a two-dimensional planar configuration to a three-dimensional porous architecture. By utilizing the third dimension (vertical pore depth), the electrode achieves both thin overall thickness (for fast ion diffusion) and large internal surface area (for high capacitance). The porous structure allows ions to access extensive surface area through short vertical pathways, resolving the contradiction between thickness and surface area.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The method results in a supercapacitor with increased capacitance, power, and energy storage capabilities by widening the surface area for electron absorption, achieving capacitance values of 56 to 90 mF/cm2 and power and energy densities of 41 to 69 Wh/kg and 3.5 to 10.6 kW/kg.

Implementation Method 1

The filter may be composed of AAO (anodized aluminum oxide)

Methodology Applied

Scientific EffectAnodizing: Anodising

Implementation Method 2

forming a first plating layer connecting one end of the filter, forming a second plating layer lengthened along the filter from the first plating layer

Methodology Applied

Scientific EffectElectroplating: Electroplating

Implementation Method 3

polymerizing to form a conductive polymer layer between the second plating layer

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Data Source

PatentUS8107222B2Supercapacitor and manufacturing method thereof

Publication Date: 2012.01.31 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A supercapacitor and a manufacturing method thereof are disclosed. With manufacturing method of Supercapacitor including: arranging a plurality of filters to be spaced at a designated interval apart, forming a first plating layer connecting one end of the filter, forming a second plating layer lengthened along the filter from the first plating layer, polymerizing to form a conductive polymer layer between the second plating layer, and removing the filter, capacitance (C), power (kw) and energy (E) can be increased as the space for absorbing electrons is widened, by making the surface area of an electrode wider than the a general film.