Printable Graphene Ink for Solid-State Supercapacitors

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Solution Overview

Problem

Current methods for fabricating graphene electrodes for supercapacitors and microsupercapacitors face challenges such as instability, complex fabrication processes, and high costs, limiting their scalability and versatility, particularly for microsupercapacitors with interdigitated structures.

Innovation Solution

A method involving a graphene ink composition with ethyl cellulose is used, where graphene is exfoliated with an organic solvent and cellulosic polymer, then deposited and annealed to form electrodes without the need for chemically-treated or vapor-deposited graphene, allowing for scalable and cost-effective fabrication of all-solid-state supercapacitors and microsupercapacitors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If chemical methods are used to synthesize graphene oxide and reduce it, then graphene electrodes can be prepared, but the process becomes complex and costly with stability issues

Engineering Contradiction:

Improvestability of graphene electrodeVSAvoidcomplexity of fabrication process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the problematic chemical treatment steps (graphene oxide synthesis and reduction) from the fabrication process. By using pristine graphene directly without chemical conversion, the method removes the sources of instability and complexity associated with GO-based electrodes while maintaining the desired electrochemical performance.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of following the conventional approach of converting graphene to GO and then reducing it back to graphene, the patent inverts the logic by using pristine graphene directly. This reversal eliminates the unnecessary intermediate steps and their associated problems, achieving a simpler and more stable electrode fabrication process.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If chemical vapor deposition is used to prepare graphene, then high-quality graphene can be obtained, but scalability is limited and harsh conditions are required

Engineering Contradiction:

Improvequality of graphene electrodeVSAvoidscalability of fabrication process

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent replaces the complex chemical vapor deposition process with a simple solution-based printing method. By substituting the harsh CVD conditions with an aqueous ink formulation that can be deposited and dried under ambient conditions, the method achieves comparable electrode quality while dramatically improving scalability and ease of manufacturing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental parameters of the fabrication process by transitioning from high-temperature CVD conditions to ambient temperature solution processing. This parameter change enables scalable production while maintaining electrode quality, as the pristine graphene in aqueous ink can be deposited and activated without harsh synthetic conditions.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If laser scribing is used to prepare porous graphene networks, then electrodes can be fabricated, but the method suffers from limitations in versatility and performance

Engineering Contradiction:

Improveease of electrode fabricationVSAvoidversatility for different supercapacitor structures

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal fabrication approach using printable pristine graphene ink that can be applied to various supercapacitor architectures (planar, interdigitated, flexible) without requiring method modification. The ink formulation and printing process serve multiple functions and are adaptable to different device configurations, overcoming the limitations of laser scribing which is less versatile.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Quantity of substance

If conventional graphene fabrication methods are used, then electrodes can be produced, but cost-effectiveness and scalability are compromised

Engineering Contradiction:

Improveproduction volume of electrodesVSAvoidcost-effectiveness of fabrication

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent employs a disposable, inexpensive aqueous ink formulation containing pristine graphene that can be readily prepared and printed. This approach replaces expensive and complex fabrication methods with a low-cost, simple printing process that uses readily available materials, significantly reducing manufacturing costs while enabling high-volume production of electrodes.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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

This approach results in high-performance graphene electrodes with excellent electrical conductivity and mechanical flexibility, enabling the production of robust, scalable, and cost-effective solid-state energy storage devices suitable for flexible electronics and portable applications.

Implementation Method 1

graphene can be exfoliated with a medium comprising an organic solvent at least partially miscible in water, and a cellulosic polymer

Methodology Applied

Scientific EffectExfoliation:

Implementation Method 2

preparation of pristine graphene solutions, dispersions and related graphene ink compositions

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Implementation Method 3

depositing such an ink composition on a substrate

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Implementation Method 4

annealing such a graphene ink composition to decompose ethyl cellulose and provide an electrode component comprising graphene

Methodology Applied

Scientific EffectAnnealing: Annealing

Implementation Method 5

annealing such a graphene ink composition to decompose ethyl cellulose

Methodology Applied

Scientific EffectDecomposition: Decomposition (biological)

Implementation Method 6

SCs store energy in electrochemical double layers formed by highly reversible ion adsorption processes at the interface between electrodes and electrolyte

Methodology Applied

Scientific EffectIon adsorption: Adsorption