Redox-Active PVA Hydrogel Electrolyte for Anti-Freezing Energy Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hydrogel electrolytes used in energy storage devices tend to lose water content, become dry and crack, malfunction at freezing temperatures, and are often flammable and unstable, limiting their performance in portable and wearable electronic devices.
Innovation Solution
A hydrogel composition comprising a polyvinyl alcohol (PVA) matrix and lithium bromide (LiBr) solution, which remains unfrozen at low temperatures, retains water content, and is non-flammable, with a method of preparation involving mixing PVA and LiBr solutions to create a clear hydrogel electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolytes are used in energy storage devices, then high ionic conductivity is achieved, but the devices require precise sealing/packaging which adds volume and weight
Solution Approach 1:
The patent employs hydrogel electrolytes with gel structures that form flexible, thin-film configurations. The gel matrix (comprising polymers like PVA, PEO, or their blends) creates a self-supporting structure that eliminates the need for rigid sealing containers, thereby reducing device volume and weight while maintaining ionic conductivity through the gel network.
Solution Approach 2:
The invention extracts the electrolyte from liquid form and transforms it into a gel state by incorporating gelling agents (such as borax, calcium chloride, or natural polymers). This extraction of the liquid phase and replacement with a gel structure removes the requirement for precise sealing while preserving the essential ionic conduction function.
2Object-affected harmful factors
If aqueous electrolytes are used in energy storage devices, then non-flammability and environmental safety are achieved, but the operational voltage is limited to the breakdown voltage of water
Solution Approach 1:
The patent creates composite electrolyte systems by combining aqueous gel matrices with redox-active additives (such as iron salts, manganese compounds, or organic redox mediators). This composite approach maintains the non-flammable nature of the aqueous base while introducing chemical species that enable higher operational voltages through redox reactions, effectively decoupling the safety advantage from the voltage limitation.
Solution Approach 2:
The invention changes the chemical composition parameters of the aqueous electrolyte by adding redox-active substances and adjusting pH, ionic strength, and temperature. These parameter modifications allow the electrolyte to operate at voltages exceeding the theoretical water breakdown voltage through controlled redox processes, while the aqueous gel structure maintains non-flammability.
3Use of energy by moving object
If organic electrolytes are used in energy storage devices, then high potential operation near 3V is achieved, but flammability and safety issues arise
Solution Approach 1:
The patent introduces redox-active mediators as intermediary substances that facilitate high-voltage operation without requiring flammable organic solvents. These mediators (such as ferricyte/ferrocyanide couples, quinone derivatives, or transition metal complexes) act as electron transfer intermediaries that enable high potential windows while the aqueous gel matrix provides a non-flammable medium, thus mediating between the conflicting requirements of high voltage and safety.
4Ease of operation
If currently used hydrogel electrolytes are used in energy storage devices, then flexibility and high conductivity are achieved, but water content is lost during operation causing the electrolyte to become dry and crack
Solution Approach 1:
The patent designs hydrogel electrolytes with self-regulating water retention mechanisms. The gel matrix incorporates hydrophilic polymers (such as PVA, PEO, chitosan, or alginate) that actively bind and retain water molecules through hydrogen bonding and hydrophilic interactions. This self-service mechanism allows the electrolyte to maintain its water content autonomously during operation, preventing drying and cracking while preserving flexibility.
Solution Approach 2:
The invention creates composite hydrogel structures by blending multiple polymers (e.g., PVA with PEO, or synthetic polymers with natural polymers like chitosan and alginate). This composite approach enhances water retention capacity through synergistic effects of different polymer networks, while maintaining the flexibility and ionic conductivity required for effective operation.
5Adaptability or versatility
If currently used electrolytes are used in energy storage devices, then operation at various temperatures is attempted, but malfunction occurs at freezing temperatures
Solution Approach 1:
The patent modifies the physical and chemical parameters of the hydrogel electrolyte by adjusting polymer concentration, crosslinking density, and ionic composition. These parameter changes lower the freezing point of the electrolyte and maintain ionic mobility at low temperatures. The gel structure prevents complete freezing while preserving conductivity, enabling reliable operation across a broad temperature range including sub-zero conditions.
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 hydrogel electrolyte maintains over 70% of its initial water content, exhibits high ionic conductivity, and provides a stable, non-flammable, and redox-active electrolyte that remains unfrozen below 0°C, enhancing the performance and durability of energy storage devices.
Implementation Method 1
highly conductive hydrogel electrolytes
Implementation Method 2
high water retention
Implementation Method 3
anti-freezing properties
Implementation Method 4
redox active with a stable self-discharge rate
Data Source
AI summary
A hydrogel composition and its use as an electrolyte in energy storage devices is described. The hydrogel can include a polyvinyl alcohol (PVA) matrix and an aqueous solution of lithium bromide (LiBr). The hydrogel electrolyte has high water retention ability, anti-freezing properties, is non-flammable, and has redox activity with a stable self-discharge rate.