Electrolyte Hydrogel Network for High-Concentration Zinc Ion Conduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional gelled electrolytes for electrochemical cells, particularly those with zinc-based electrodes, face challenges such as ion precipitation and limited zinc salt concentration due to interactions with sodium carboxymethyl cellulose, leading to agglomeration and reduced ion conductivity.
Innovation Solution
A self-standing polymer network electrolyte hydrogel is developed using a crosslinked non-ionic polymer and a cationic polymer in an aqueous solvent, which prevents agglomeration and allows high salt concentrations, ensuring stable and efficient ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional gelled electrolytes use sodium carboxymethyl cellulose as thickening agent, then the electrolyte structure is stabilized, but ion precipitation and agglomeration occur leading to reduced ion conductivity
Solution Approach 1:
The patent changes the chemical nature of the polymer from anionic (sodium carboxymethyl cellulose) to non-ionic (polyethylene oxide), fundamentally altering the interaction mechanism with zinc ions. This parameter change eliminates the precipitation problem while maintaining gel structure stability, as non-ionic polymers do not form insoluble complexes with metal ions.
Solution Approach 2:
The patent creates a composite electrolyte system combining polyethylene oxide polymer matrix with zinc chloride salt and water. This composite structure leverages the gel-forming capability of PEO while incorporating high concentrations of zinc salt, achieving both structural stability and high ion conductivity through synergistic material combination.
2Reliability
If high concentrations of zinc salt are added to improve ion conductivity, then ion mobility increases, but agglomeration and precipitation occur reducing electrolyte performance
Solution Approach 1:
The patent changes the polymer charge state from anionic to non-ionic, which fundamentally alters the solvation mechanism. Non-ionic polyethylene oxide chains solvate zinc ions through oxygen lone pairs without electrostatic repulsion, allowing high salt concentrations (up to 2.5 M or higher) to remain homogeneous without precipitation or agglomeration.
3Ease of manufacture
If conventional gelled electrolytes are used with zinc-based electrodes, then the cell structure is complete, but zinc ion precipitation occurs during operation
Solution Approach 1:
The patent changes the polymer chemistry from anionic carboxymethyl cellulose to non-ionic polyethylene oxide, eliminating the chemical incompatibility with zinc ions. This parameter change prevents precipitation during cell operation while maintaining ease of manufacture through similar gel formation processes.
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 provides improved ionic conductivity and mechanical stability, reducing ion concentration gradients and enhancing the performance of electrochemical cells, especially those with zinc electrodes, by maintaining ion mobility and preventing precipitation.
Implementation Method 1
electrolyte hydrogel for an electrochemical cell which is based on a self standing polymer network with a crosslinked, non-ionic polymer and a cationic polymer
Implementation Method 2
crosslinking of the non-ionic polymer occurs and thereby the electrolyte hydrogel is formed based on a self standing polymer network
Implementation Method 3
for the purposes of charge equalization, an ion stream corresponding to the electrode reaction is present within the cell. This ion stream passes through the separator, usually mediated by an ion-conducting electrolyte
Data Source
AI summary
An electrolyte hydrogel for an electrochemical cell includes a self standing polymer network with a crosslinked, non-ionic polymer and a cationic polymer and a salt in an aqueous solvent and/or dispersant.