Lignin-Based Flow Battery Electrolytes for Grid Storage
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Solution Overview
Problem
The integration of intermittent renewable energy sources like solar and wind into the electric grid poses challenges due to their intermittent nature, requiring supplemental power sources during high demand periods, and existing energy storage solutions like solid electrode batteries are costly and inefficient for long-duration load deferment.
Innovation Solution
Development of novel flow battery electrolytes using lignin or ligninsulfonate, which are sustainable, non-toxic, and metal-free, allowing for independent scaling of energy and power, enabling cost-effective large-scale energy storage without the need for expensive power equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If solid electrode batteries are used for energy storage, then power output can be maintained, but energy storage duration cannot be extended without increasing power equipment capacity
Solution Approach 1:
The patent segments the battery system into two independent components: power equipment (electrodes, membranes, cell stack) and energy storage (electrolyte volume). This allows the electrolyte to be separated from the power-generating components, enabling independent scaling of energy duration without increasing power capacity. The flowing electrolyte contains the energy while the stationary cell stack provides the power conversion capability.
Solution Approach 2:
The patent employs hydraulic principles by using flowing liquid electrolytes that circulate through the cell stack. The kinetic energy of the flowing electrolyte enables continuous charge-discharge cycles, and the flow rate can be independently controlled to extend storage duration without modifying the power equipment. This fluid-based approach decouples energy capacity from power capacity.
2Duration of action of moving object
If conventional flow battery electrolytes are used, then energy storage duration can be extended, but cost increases due to expensive materials
Solution Approach 1:
The patent substitutes expensive conventional electrolyte materials (such as vanadium salts) with inexpensive, abundant organic compounds. Specifically, it uses derivatives of common molecules like phenol, benzoic acid, or salicylic acid that can be synthesized cheaply or obtained from natural sources. These low-cost electrolytes maintain the flow battery's ability to provide extended storage duration while dramatically reducing material costs.
Solution Approach 2:
The patent employs composite electrolyte formulations combining organic redox-active compounds with supporting electrolytes and additives. This composite approach enables the use of inexpensive organic molecules while maintaining electrical conductivity and electrochemical stability through the supporting electrolyte components, achieving both cost reduction and functional performance.
3Quantity of substance
If flow batteries are designed for long duration storage, then energy capacity increases, but power equipment capacity must also increase in conventional batteries
Solution Approach 1:
The patent segments the battery system into two independent components: power equipment (electrodes, membranes, cell stack) and energy storage (electrolyte volume). This allows the electrolyte to be separated from the power-generating components, enabling independent scaling of energy duration without increasing power capacity. The flowing electrolyte contains the energy while the stationary cell stack provides the power conversion capability.
Solution Approach 2:
The patent designs a universal cell stack that can handle varying electrolyte flow rates and volumes. The same power equipment can serve multiple functions: converting power at any rate while the electrolyte volume and flow rate independently determine energy capacity. This multi-functionality allows a single power equipment design to support different storage durations by simply adjusting electrolyte parameters.
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 lignin-based flow battery system provides a viable, cost-effective solution for long-duration grid-scale energy storage, offering multiple charge-discharge cycles with improved efficiency and reduced environmental impact, suitable for residential solar energy storage and grid stability.
Implementation Method 1
redox flow battery development has historically been burdened by the high costs of their materials of construction, high cost of electrolytes, and precious metal catalysts required to drive the desired redox reaction
Data Source
AI summary
Lignin-based electrolytes and flow battery cells and systems for use with lignin-based electrolytes are disclosed.