Graphene-TiO2 Electrode Ink for Printable Energy Storage
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Solution Overview
Problem
Current printable electronics face challenges in materials performance and reliability, particularly in the development of suitable nanomaterials for mass-producing flexible and cost-effective energy storage devices like batteries and capacitors, where carbon nanotubes are unsuitable due to poor solubility and potential toxicity.
Innovation Solution
A graphene-based ink formulation comprising graphene platelets, titanium dioxide nanoparticles, and a binder, such as poly(sodium 4-styrenesulfonate), is used to create electrodes for lithium batteries and capacitors, enhancing solubility and conductivity while being non-toxic, facilitating the formation of high-performance, printable energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If carbon nanotubes are used to form electrodes, then storage capacity is enhanced, but solubility is poor and toxicity is high
Solution Approach 1:
The patent changes the material parameter from carbon nanotubes to graphene platelets, which have different physical and chemical properties. Graphene platelets exhibit superior solubility in common solvents and non-toxic characteristics while maintaining high storage capacity, thus resolving the contradiction between enhanced performance and harmful effects
Solution Approach 2:
The patent creates a composite electrode material combining graphene platelets with conductive polymers and binding agents. This composite structure leverages the non-toxic and soluble nature of graphene while incorporating functional components that enhance storage capacity, effectively addressing both the performance enhancement and toxicity reduction requirements
2Object-affected harmful factors
If carbon nanotubes are modified with functional groups to improve solubility, then solubility is enhanced, but intrinsic conductivity is sacrificed
Solution Approach 1:
Instead of modifying carbon nanotubes with functional groups (which reduces conductivity), the patent inverts the approach by selecting graphene platelets that inherently possess both high solubility and high conductivity. This eliminates the need for functional group modification and preserves the intrinsic conductivity while achieving the desired solubility
Solution Approach 2:
The patent changes the fundamental material parameter from carbon nanotubes to graphene platelets, which have different surface chemistry and electronic properties. Graphene platelets naturally exhibit high solubility in various solvents and maintain excellent electrical conductivity, thus resolving the contradiction without requiring chemical modification that would compromise conductivity
3Productivity
If conventional printing techniques are used with conductive electronic inks, then mass production is enabled, but performance and reliability are less than conventional electronics
Solution Approach 1:
The patent develops a composite conductive ink formulation containing graphene platelets, conductive polymers, and binding agents. This composite material maintains the printability and mass production capability of conventional inks while significantly enhancing the electrical conductivity, adhesion, and overall performance of the printed electrodes, thus resolving the contradiction between manufacturability and performance
Solution Approach 2:
The patent changes the material composition parameter of the conductive ink by replacing traditional metal nanoparticle-based inks with graphene platelet-based inks. This parameter change results in improved electrical conductivity, better adhesion to substrates, and enhanced flexibility, all while maintaining the advantages of conventional printing techniques for mass production
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 graphene-titanium dioxide electrode formulation enables the production of cost-effective, high-performance lithium-metal batteries and lithium-ion capacitors with improved conductivity and solubility, suitable for mass production and integration into portable electronic devices.
Implementation Method 1
a binder, the binder configured to facilitate the binding together of the graphene and titanium dioxide to form the electrode
Implementation Method 2
an electrolyte, the electrolyte configured to allow the transfer of mobile ions to and/or from the first and/or second electrodes to enable the generation and/or storage of electrical energy
Implementation Method 3
graphite is a popular material for fabricating lithium battery electrodes due to its high reactivity and ion adsorption properties
Data Source
AI summary
An electrode comprises graphene, titanium dioxide and a binder, the binder configured to facilitate the binding together of the graphene and titanium dioxide to form the electrode.