Organic Electrolyte for Redox Flow Battery
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Solution Overview
Problem
Conventional redox flow batteries have limited energy density due to their reliance on aqueous solvents, which restricts operating voltage and results in low energy storage capacity and reduced cell life, especially when using metal ions that precipitate or degrade during charge-discharge cycles.
Innovation Solution
The use of an organic electrolyte solution containing a nickel-ligand coordination compound that remains stable in a non-aqueous solvent, allowing for reversible oxidation-reduction reactions and maintaining zero oxidation state, thereby enhancing energy density and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If aqueous solvents are used in redox flow batteries, then the batteries can operate with simple electrolyte composition, but the operating voltage is restricted and energy density is limited
Solution Approach 1:
The patent changes the fundamental parameter of the solvent system from aqueous to non-aqueous organic solvent. This parameter change enables the use of metal-ligand coordination compounds that can undergo multi-electron transfer reactions without precipitation, thereby increasing the quantity of active material and energy density while maintaining manageable system complexity through systematic selection of compatible solvent-electrolyte pairs.
Solution Approach 2:
The patent employs composite material strategy by combining non-aqueous organic solvents with metal-ligand coordination compounds forming a new electrolyte system. This composite approach allows the electrolyte to simultaneously provide high solubility for metal complexes, enable multi-electron transfer reactions, and prevent precipitation, thereby resolving the contradiction between simplicity and energy density.
2Ease of manufacture
If metal ions are used in aqueous electrolytes, then the electrolyte preparation is simple, but the metal ions precipitate or degrade during charge-discharge cycles reducing cell life
Solution Approach 1:
The patent changes the oxidation state parameter of metal ions from positive to zero by using metal-ligand coordination compounds. This parameter change prevents precipitation and degradation during charge-discharge cycles, thereby extending cell life. The ease of manufacture is maintained through straightforward synthesis of coordination compounds and simple electrolyte preparation procedures.
Solution Approach 2:
The patent introduces ligands as intermediary molecules that coordinate with metal ions to form stable coordination compounds. These ligands act as protective intermediaries that prevent direct interaction between metal ions and the electrolyte environment, thereby preventing precipitation and degradation while maintaining electrochemical activity during charge-discharge cycles.
3Power
If aqueous electrolyte solutions are used, then the system has good ionic conductivity, but the operating voltage is limited by water decomposition potential
Solution Approach 1:
The patent changes the solvent parameter from water to non-aqueous organic solvent, which fundamentally expands the operating voltage window by eliminating water decomposition limitations. The ionic conductivity is maintained through careful selection of organic solvents with appropriate dielectric constants and viscosity, and by optimizing the concentration and structure of metal-ligand coordination compounds to ensure sufficient ion mobility.
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 implementation of the organic electrolyte solution with nickel-ligand coordination compounds in redox flow batteries significantly increases energy density and charge-discharge efficiency, with improved stability and performance compared to traditional systems.
Implementation Method 1
one of catholyte and the anolyte comprises a metal-ligand coordination compound that is a nickel-ligand coordination compound that has at least two electrons being transferred during oxidation-reduction
Implementation Method 2
an ion exchange membrane disposed between the cathode cell and the anode cell
Implementation Method 3
the nickel-ligand coordination compound that has at least two electrons being transferred during oxidation-reduction, and is dissolved in an electrolyte solution while the nickel in the nickel-ligand coordination compound is in a zero oxidation state
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An organic electrolyte solution for use in a redox flow battery and the redox flow battery including the organic electrolyte solution has a high energy density because re-precipitation is prevented in the organic electrolyte solution or eduction is prevented in an electrode during reduction of a metal ion used as an electrolyte.