Solid Polymer Electrolyte for Supercapacitors via Zwitterionic Ionic Liquid
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Solution Overview
Problem
Conventional electrolytes for supercapacitors face limitations such as narrow operating voltage range due to water solvents, low ion conductivity, and vulnerabilities like vaporization, leakage, and safety concerns, which restrict their energy density and design flexibility.
Innovation Solution
A solid electrolyte is developed by polymerizing a zwitterionic monomer in a solvent-free ionic liquid, eliminating the need for solvents and enhancing the electrolyte's stability and conductivity, allowing for a wider voltage window and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aqueous electrolyte is used, then ion conductivity is improved, but operating voltage range is limited due to water decomposition
Solution Approach 1:
The patent changes the fundamental parameter of the electrolyte system by replacing aqueous-based solvents with ionic liquids that have negligible vapor pressure and high electrochemical stability. This allows the electrolyte to maintain high ion conductivity while operating at voltages beyond water's decomposition limit (1.24V), thereby resolving the contradiction between conductivity and voltage range.
Solution Approach 2:
The patent creates a composite solid electrolyte system combining polymer matrices with ionic liquid components. This composite structure provides both the mechanical stability needed for solid electrolytes and the high ion conductivity characteristic of liquid electrolytes, while eliminating vaporization issues and expanding the operating voltage window.
2Temperature
If organic electrolyte is used, then voltage window is widened, but ion conductivity is reduced
Solution Approach 1:
The patent modifies the electrolyte composition by using ionic liquids with specific cation-anion combinations that optimize both voltage stability and ion mobility. The ionic liquid structure allows for tailored conductivity through selection of appropriate ions, maintaining high ion conductivity while preserving the wide voltage window advantage of organic electrolytes.
3Reliability
If liquid electrolyte is used, then ion conductivity is improved, but safety and leakage issues worsen
Solution Approach 1:
The patent employs a solid polymer electrolyte membrane structure that functions as a flexible barrier, preventing leakage while maintaining ion transport capability. This solid film structure eliminates the leakage and safety hazards associated with liquid electrolytes while preserving necessary ionic conductivity through the membrane.
Solution Approach 2:
The composite solid electrolyte combines polymer structural integrity with ionic liquid conductivity, creating a material that is both safe (no leakage) and conductive. The solid matrix provides containment while the ionic liquid channels enable ion flow, resolving the contradiction between conductivity and safety.
4Temperature
If solvent-free ionic liquid is used for polymerization, then thermal stability is improved, but processability becomes more difficult
Solution Approach 1:
The patent uses the ionic liquid as an intermediary medium during polymerization that provides a unique reaction environment. The ionic liquid facilitates monomer dissolution and polymerization while maintaining thermal stability, and the resulting solid electrolyte retains processability through controlled ionomer formation and membrane fabrication techniques.
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 solvent-free solid electrolyte achieves high ion conductivity, flexibility, and thermal stability, enabling supercapacitors with enhanced energy and power density, reduced leakage risk, and the ability to form complex shapes, while maintaining stability beyond the decomposition voltage of water.
Implementation Method 1
performing polymerization of a zwitterionic monomer in a solvent-free ionic liquid
Implementation Method 2
the electrolyte directly contains ions that form the electric double layer
Data Source
AI summary
The present disclosure relates to a solid-state polymer electrolyte with improved processability and a method for manufacturing the same, and more particularly to a solid electrolyte containing a polymer obtained by pertaining polymerization of a zwitterionic monomer in a solvent-free ionic liquid.