MXene Film Compositions for High-Capacitance Transparent Conductors
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Solution Overview
Problem
Current electrode materials for energy storage devices, such as batteries and supercapacitors, face challenges in achieving high volumetric capacitance, cyclability, and cost-effectiveness, while transparent conductors like ITO are limited by high material costs and complex fabrication processes.
Innovation Solution
Development of novel two-dimensional Mn+1Xn(Ts) MXene compositions, specifically Ti3C2, produced through etching titanium aluminum carbide with fluoridic acids, allowing for the creation of highly conductive, flexible, and transparent films without additives, enabling high volumetric capacitance and low material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional porous carbons or activated carbons are used for electrodes, then manufacturing is simple and cost-effective, but volumetric capacitance is limited to 60-100 F/cm3
Solution Approach 1:
The patent changes the fundamental physical and chemical parameters of the electrode material by transitioning from three-dimensional porous carbons to two-dimensional MXene materials with lateral dimensions of 1-10 micrometers and thickness of 1-100 nanometers. This dimensional change enables volumetric capacitance to increase from 60-100 F/cm3 to over 300 F/cm3 while maintaining ease of manufacture through scalable synthesis methods
2Quantity of substance
If hydrated ruthenium oxide is used to achieve high volumetric capacitance of 1000-1500 F/cm3, then energy storage performance is excellent, but the material is limited to thin films only
Solution Approach 1:
The patent transitions from three-dimensional bulk hydrated ruthenium oxide to two-dimensional MXene materials with lateral dimensions of 1-10 micrometers. This dimensional change allows the material to achieve high volumetric capacitance (300-1500 F/cm3) while being manufacturable in thicker films ranging from 1 to 100 micrometers, overcoming the thin-film limitation of conventional ruthenium oxide
3Reliability
If ITO is used for transparent conductors, then electrical conductivity and transparency are achieved, but material cost and fabrication complexity increase significantly
Solution Approach 1:
The patent replaces expensive ITO (indium tin oxide) with MXene materials that can be synthesized from abundant, low-cost precursors such as titanium aluminum carbide. The MXene films achieve comparable or superior electrical conductivity and optical transparency at a fraction of the material cost, eliminating the need for expensive sputtering equipment and complex fabrication processes
4Illumination intensity
If graphene is used for transparent conductors, then transparency is achieved, but electrical conductivity is substantially decreased by redox-active functional groups
Solution Approach 1:
The patent changes the chemical composition and electronic structure parameters by using MXene materials with transition metal carbide nitride compositions (Mn+1Xn(Ts)) that inherently possess high electrical conductivity despite optical transparency. The material's conductivity is maintained through controlled surface terminations (Ts) and intercalation, achieving conductivity-transparency ratios that surpass graphene while maintaining stability against redox reactions
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 MXene films demonstrate exceptional volumetric capacitance of up to 1000 F/cm3 with excellent cyclability and rate performance, and can be processed into thin, transparent conductive layers, offering a cost-effective and scalable solution for energy storage and transparent electronics.
Implementation Method 1
etching the aluminum from Ti3AlC2 using fluoridic acids
Implementation Method 2
highly conductive, flexible, and transparent films
Implementation Method 3
volumetric capacitance on the order of 1000 F/cm3
Data Source
AI summary
The present invention(s) is directed to novel conductive Mn+1Xn(Ts) compositions exhibiting high volumetric capacitances, and methods of making the same. The present invention(s) is also directed to novel conductive Mn+1Xn(Ts) compositions, methods of preparing transparent conductors using these materials, and products derived from these methods.