Redox Polymer Electrodes with Dione Units for Supercapacitor Stability
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Solution Overview
Problem
Conventional electroactive conducting polymers used in supercapacitors exhibit poor cycling stability, limiting their potential for commercial applications due to limited cycle durability, which hampers the development of high-performance energy storage devices.
Innovation Solution
The use of novel redox polymers containing 4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-4,9-dione units, which can be polymerized and deposited onto nanostructured materials like SiNWs, providing enhanced stability and robustness for energy storage applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional electroactive conducting polymers are used in supercapacitors, then high power and energy density can be achieved, but cycling stability deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of conventional conducting polymers to create redox polymers with dione units. This structural parameter change transforms the polymer's redox mechanism, enabling reversible two-electron transfers that significantly improve cycling stability while maintaining high power and energy density. The specific chemical modification (introduction of dione units) allows the polymer to achieve exceptional stability over 10,000 cycles while preserving electrochemical performance.
Solution Approach 2:
The patent employs composite materials by combining silicon nanowires (SiNWs) with redox polymers containing dione units to create a hybrid electrode structure. This composite approach leverages the high surface area and conductivity of SiNWs together with the superior redox activity and stability of the modified polymer, achieving both high power density and exceptional cycling stability that neither material could provide alone.
2Use of energy by moving object
If conventional electroactive conducting polymers are used in supercapacitors, then high energy density can be achieved, but cycling stability deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of conventional conducting polymers to create redox polymers with dione units. This structural parameter change transforms the polymer's redox mechanism, enabling reversible two-electron transfers that significantly improve cycling stability while maintaining high power and energy density. The specific chemical modification (introduction of dione units) allows the polymer to achieve exceptional stability over 10,000 cycles while preserving electrochemical performance.
Solution Approach 2:
The patent employs composite materials by combining silicon nanowires (SiNWs) with redox polymers containing dione units to create a hybrid electrode structure. This composite approach leverages the high surface area and conductivity of SiNWs together with the superior redox activity and stability of the modified polymer, achieving both high power density and exceptional cycling stability that neither material could provide alone.
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 implementation of these redox polymers results in electrodes with improved cycling stability and robustness, enabling high power and energy density values, surpassing the limitations of conventional polymers by maintaining performance over a larger number of cycles.
Implementation Method 1
rechargeable electrochemical cells composed of two compartments separated by a separator, in which the cathodic compartment contains a cathodic lithium insertion material and p- type redox active compounds and the anodic compartment contains anodic lithium insertion material and n-type redox active compounds
Implementation Method 2
rechargeable electrochemical cell comprising two compartments separated by a separator permeable to lithium ions
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~3C
AI summary
The present invention concerns an electrode comprising a support made of a conductor or semiconductor, at least one nanostructure made of a conductor or semiconductor, on at least one of the support surfaces, a layer of redox polymer containing dione units deposited onto the at least one nanostructure. The present invention also concerns processes for preparing an electrode coated with such a redox polymer and electrode-based energy storage device containing such a coated electrode. The redox polymer being based on indacenothiophene.