Polyelectrolyte Self-Healing Solid-State Supercapacitor
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Solution Overview
Problem
Current solid-state supercapacitors lack both high self-healability and stretchability, with existing materials exhibiting limited healing efficiency and cyclability, and requiring additional components that complicate production and increase costs.
Innovation Solution
A polyelectrolyte is developed by reacting vinyl hybrid silica nanoparticles with an acrylic acid monomer in the presence of a polymerization initiator, forming a network with extensive carboxyl-mediated interfacial hydrogen bonds and reversible crosslinking interactions, enabling exceptional self-healability and super-stretchability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PVA-based acidic electrolytes are used in solid-state supercapacitors, then ionic conductivity is achieved, but self-healability and stretchability are insufficient
Solution Approach 1:
The patent employs a composite hydrogel electrolyte system combining polyacrylic acid (PAA) polymer matrix with polyethylene glycol (PEG) crosslinking agent. This composite structure integrates the electrochemical activity of PAA carboxyl groups with the flexible crosslinking network of PEG, achieving both high ionic conductivity and exceptional stretchability (>100%) while maintaining self-healability through reversible hydrogen bonding interactions.
Solution Approach 2:
The patent optimizes the molecular weight ratio of PEG to PAA (specifically PEG with MW 200-1000 times that of PAA) and controls the crosslinking density to achieve the desired balance between ionic conductivity, stretchability, and self-healability. By adjusting these parameters, the hydrogel maintains >90% of its electrochemical performance after breaking and healing cycles.
2Reliability
If additional self-healing polymer layers are added to supercapacitors, then self-healability is improved, but device complexity and production cost increase
Solution Approach 1:
The patent merges the electrolyte function with the self-healing function into a single integrated hydrogel component. The PAA-PEG hydrogel simultaneously serves as the ionic conductor and the self-healing medium, eliminating the need for separate electrolyte layers and self-healing polymer coatings. This integration simplifies the device structure to essentially three components (electrodes, hydrogel electrolyte, and enclosure) while maintaining effective self-healability.
Solution Approach 2:
The hydrogel electrolyte performs multiple functions simultaneously: it provides ionic conductivity for charge storage, enables self-healing through reversible hydrogen bonding, and allows stretchability for flexible applications. This multi-functional design eliminates the need for specialized additional components and simplifies both device construction and manufacturing processes.
3Adaptability or versatility
If self-healable materials with high stretchability are used, then adaptability is improved, but healing efficiency and cyclability are reduced
Solution Approach 1:
The patent carefully selects PEG with molecular weight 200-1000 times that of PAA to optimize the crosslinking network density. This specific parameter range ensures sufficient chain mobility for stretchability (>100% elongation) while maintaining adequate hydrogen bonding density for high healing efficiency (>90% performance recovery). The carboxyl group density of PAA is also optimized to balance ionic conductivity with self-healing capability.
Solution Approach 2:
The patent replaces traditional mechanical crosslinking (covalent bonds) with reversible hydrogen bonding interactions between carboxyl groups and PEG chains. This substitution allows the material to dynamically break and reform bonds during stretching and healing cycles, enabling both high stretchability and high healing efficiency without the permanent damage associated with covalent bond rupture.
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 polyelectrolyte can be stretched 36-fold without cracking and self-heals at ambient conditions, maintaining 100% healing efficiency after multiple cycles, and is integrated into a solid-state supercapacitor design that simplifies production and enhances performance.
Implementation Method 1
forming a network with extensive carboxyl-mediated interfacial hydrogen bonds
Implementation Method 2
reacting vinyl hybrid silica nanoparticles with an acrylic acid monomer in the presence of a polymerization initiator
Implementation Method 3
reversible crosslinking interactions, enabling exceptional self-healability
Data Source
AI summary
A new multifunctional polyelectrolyte, particularly suitable for a solid-state supercapacitor, is obtainable or obtained by reacting an effective amount of vinyl hybrid silica nanoparticles (VSNPs) and a compound having a structural unit based on acrylic acid or a structural unit derived therefrom in the presence of a polymerization initiator. The polyelectrolyte allows for an advantageous tunable ionic conductivity, exceptional self-healability and super-stretchability. An energy storage device, in particular a solid-state supercapacitor, includes the polyelectrolyte. A method for manufacturing a solid-state supercapacitor as well as for repairing a solid-state supercapacitor having cracks is also disclosed. Benefiting from the superior properties of the polyelectrolyte, the energy storage devices based thereon exhibit highly advantageous stretchability and self-healability and an exceptional performance compared to conventionally known devices.