Double-Network Gel Electrolyte for Flexible Energy Storage Stability
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Solution Overview
Problem
Conventional flexible energy storage devices using all-solid or semi-solid electrolytes face stability issues under extreme conditions, leading to electrolyte decomposition and performance limitations, while existing materials fail to simultaneously meet electrochemical, mechanical, and thermal requirements.
Innovation Solution
A dextrin-DADMAC based double network polymer gel electrolyte is developed, comprising a first polymer network cross-linked with N,N-methylenebisacrylamide and entangled with a dextrin polymer chain, which supports a liquid electrolyte, enhancing mechanical properties and ionic conductivity through ion exchange reactions and hydrogen bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all-solid or semi-solid electrolytes are used to overcome liquid electrolyte stability issues, then stability and leakage problems are improved, but mechanical properties and elasticity deteriorate
Solution Approach 1:
The patent employs a double network composite structure combining polyacrylic acid chains with dextrin polymer chains. The polyacrylic acid network provides ionic conductivity and electrochemical stability, while the dextrin network contributes mechanical strength and elasticity. This composite architecture resolves the contradiction by integrating materials with complementary properties, achieving both stability and mechanical performance simultaneously.
2Ease of manufacture
If conventional polymer electrolyte materials are used, then ease of manufacture is improved, but simultaneous satisfaction of electrochemical, mechanical, and thermal properties deteriorates
Solution Approach 1:
The double network polymer electrolyte is designed to perform multiple functions simultaneously: the polyacrylic acid component provides ionic conduction and electrochemical stability, while the dextrin component contributes mechanical strength, elasticity, and thermal stability. This multi-functional design enables a single material system to satisfy electrochemical, mechanical, and thermal requirements concurrently, overcoming the limitations of conventional single-function polymer electrolytes.
3Reliability
If all-solid or semi-solid electrolytes are used under extreme conditions, then stability is improved, but electrolyte decomposition and separator instability occur
Solution Approach 1:
The patent utilizes the temperature-dependent gel-sol transition behavior of the double network polymer electrolyte. At low temperatures, the electrolyte maintains a gel state with stable composition and structure. At high temperatures, it transitions to a sol state, preventing decomposition and maintaining compositional stability. This parameter-based state transition resolves the contradiction between stability under extreme conditions and compositional integrity.
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 gel electrolyte exhibits improved elasticity, mechanical strength, and ionic conductivity, maintaining performance across varying temperatures and flexible deformations, with reduced volume changes and environmental friendliness.
Implementation Method 1
an ion exchange reaction between the first polymer having a network structure in which the linear main chains including diallyldimethylammonium chloride (DADMAC) monomers of the following Chemical Formula 1 are a cross-linked with each other via the N,N-methylenebisacrylamide of the following Chemical Formula 2 and an anion (ClO4−, BF4−) of a salt occurs, thereby improving mechanical properties of the gel electrolyte
Implementation Method 2
an ether group of the second polymer chain including the dextrin entangled with the first polymer network to form a double network may obtain improve ionic conductivity of the gel electrolyte
Data Source
AI summary
A dextrin-DADMAC based double network polymer gel electrolyte is disclosed. The gel electrolyte includes: a first polymer network having a network structure in which linear main chains including diallyldimethylammonium chloride (DADMAC) monomers are crosslinked with each other via N,N-methylenebisacrylamide; a second polymer network including a dextrin polymer chain, and entangled with the first polymer network to form a double network composed of the first and second polymer networks; and a liquid electrolyte supported inside the double network composed of the first and second polymer networks. In addition, mechanical properties of the polymer gel electrolyte are improved via an ion exchange reaction between the polymer gel electrolyte and a salt.