Organic Redox Molecules for High-Energy-Density Flow Batteries
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Solution Overview
Problem
Current redox flow batteries (RFBs) rely on vanadium species, which are expensive, have limited market availability, and pose environmental concerns, limiting their widespread adoption and efficiency.
Innovation Solution
Introduce two classes of small organic molecules, the 4H-pyran-4-ylidene and pyridinium/pyrazinium/pyrimidinium families, as charge carriers in RFBs, offering improved solubility, redox potential, and energy density, with tailored structures for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vanadium species are used as charge carriers in RFBs, then the batteries can achieve stable redox reactions and good electrochemical performance, but the cost increases and environmental concerns arise due to the expense and limited market availability of vanadium
Solution Approach 1:
The patent replaces expensive vanadium species with inexpensive organic molecules (4H-pyran-4-ylidene and pyridinium/pyrazinium/pyrimidinium families) that can be synthesized cost-effectively. These organic charge carriers perform redox reactions similarly to vanadium but at a fraction of the cost, directly addressing the cost barrier while maintaining functional performance
Solution Approach 2:
The patent modifies molecular parameters of organic compounds to optimize redox potential, solubility, and stability. By adjusting structural parameters such as substituent groups and molecular configuration, the organic molecules achieve redox potentials within the useful range (-1.5 V to +1.5 V vs SHE) and improved aqueous solubility, matching vanadium's electrochemical performance
2Reliability
If vanadium species are used as charge carriers in RFBs, then the batteries can achieve stable redox reactions, but market availability is limited and environmental concerns increase
Solution Approach 1:
The patent employs organic molecules that are abundant, non-toxic, and environmentally benign compared to vanadium. These organic charge carriers (4H-pyran-4-ylidene and pyridinium/pyrazinium/pyrimidinium families) can be derived from renewable resources and decompose without harmful effects, eliminating the environmental and availability constraints of vanadium
Solution Approach 2:
The patent transforms the traditional disadvantage of organic molecules (lower stability compared to inorganic vanadium) into an advantage by selecting highly stable organic structures with proven redox cyclability. The organic molecules' stability in aqueous environments and resistance to degradation convert what could be a weakness into a sustainable, eco-friendly solution
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
These organic molecules provide a cost-effective and environmentally friendly alternative to vanadium, enhancing energy density and RFB performance by storing multiple electrons per molecule, while maintaining redox potentials within the desired range.
Implementation Method 1
A rechargeable battery is an electrochemical device that stores and releases electrical energy through reversible chemical reactions
Data Source
AI summary
This disclosure provides redox cyclable molecules for energy storage. These molecules belong to either the 4H-pyran-4-ylidene family or include a six-membered aromatic ring with one nitrogen atom at position 1 (pyridinium family) or two nitrogen atoms at positions 1 and 4 (pyrazinium family) or at positions 1 and 3 (pyrimidinium family). Molecules in these families are used as analytes in redox flow batteries.