Stretchable Supercapacitor Electrolyte with Dual-Network Hydrogel
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Solution Overview
Problem
Conventional stretchable supercapacitors lose elasticity after a few stretching cycles and suffer from electrochemical performance degradation due to inorganic electrode materials and hydrogel electrolytes with limited water content, making them unsuitable for long-term usage in wearable electronics.
Innovation Solution
A stretchable energy storage device with a polymer matrix electrolyte comprising crosslinked agar and polyacrylamide structures that dissipate mechanical energy through hydrophobic interactions, maintaining elasticity and electrochemical performance even after repeated stretching, using conductive polymer electrodes for enhanced electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If inorganic electrode materials and hydrogel electrolytes are used in stretchable supercapacitors, then electrical conductivity and energy storage capacity are improved, but elasticity and durability are worsened after repeated stretching cycles
Solution Approach 1:
The patent changes the physical and chemical parameters of the electrode materials by using conductive polymers (polypyrrole, polythiophene, polyaniline) instead of inorganic materials, and employs a dual-network hydrogel electrolyte with specific crosslinking densities. These parameter changes enable the electrodes to maintain flexibility and electrical conductivity simultaneously, resolving the contradiction between electrical performance and mechanical durability
Solution Approach 2:
The patent creates a composite structure by combining conductive polymers with flexible substrates, and uses a dual-network hydrogel composite consisting of two different polymer networks with complementary properties. This composite approach allows the material to exhibit both high electrical conductivity and excellent elastic recovery after repeated stretching, directly addressing the durability issue
2Quantity of substance
If hydrogel electrolytes with limited water content are used, then energy storage capacity is improved, but elasticity and flexibility are worsened
Solution Approach 1:
The patent employs a dual-network hydrogel composite material where two different polymer networks are intertwined. One network provides water channels for ion transport (enabling energy storage), while the other network provides mechanical strength and elasticity. This composite structure resolves the contradiction between energy storage capacity and elastic flexibility
Solution Approach 2:
The patent applies local quality by creating regions with different water contents and mechanical properties within the hydrogel electrolyte. The dual-network structure creates localized areas that can independently fulfill different functions: one region optimized for ion conduction and another for mechanical support, thereby maintaining both energy storage and elasticity
3Ease of manufacture
If conventional hydrogel electrolytes are used, then ease of manufacture is improved, but elasticity after repeated stretching is worsened
Solution Approach 1:
The patent uses a dual-network hydrogel composite that can be fabricated using simple infiltration and freezing methods, maintaining ease of manufacture. The composite structure inherently provides superior elastic recovery and durability compared to conventional single-network hydrogels, thus resolving the contradiction between manufacturing simplicity and long-term elastic durability
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 device maintains excellent elasticity and electrochemical performance for over 1000 stretching cycles with minimal residual strain and capacitance retention, ensuring durability and stability in wearable electronics applications.
Implementation Method 1
the second crosslinked structure dissipates energy when subjected to the external mechanical load thereby maintaining the elasticity of the electrolyte
Implementation Method 2
the second crosslinked structure dissipates energy by rupturing the hydrophobic interactions within the structure when subjected to the external mechanical load; and restoring the interactions when the load is removed
Implementation Method 3
the combination of the first electrode, the second electrode and the electrolyte is arranged to elastically deform when subjected to an external mechanical load applied thereto
Implementation Method 4
an electrolytic solution retained by the polymer matrix
Implementation Method 5
The first electrode is an anode including a conductive polymer. the second electrode is a cathode including a conductive polymer
Data Source
AI summary
An energy storage device and a method of fabricating such energy storage device. The energy storage device includes a first electrode, a second electrode, and an electrolyte. The combination of the electrodes and the electrolyte is arranged to elastically deform when subjected to an external mechanical load applied to the energy storage device. The electrolyte includes a polymer matrix of at least two crosslinked structures, including a first polymeric material and a second polymeric material; and an electrolytic solution retained by the polymer matrix.