Ion Exchange Liquid Membrane for Low-Crossover Flow Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current flow batteries face challenges such as high costs, limited scalability, and crossover issues due to expensive ion exchange membranes and the immiscibility of catholyte and anolyte, which hinder large-scale energy storage and stability.
Innovation Solution
The use of an ion exchange liquid membrane that stratifies catholyte and anolyte independently, preventing crossover and allowing for adjustable thickness, while not dissolving active materials, thereby reducing costs and enhancing scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ion exchange membranes are used, then separation of catholyte and anolyte is achieved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive traditional ion exchange membranes with a廉价的 liquid membrane system composed of ionic liquid and surfactant. This liquid membrane can be easily prepared and replenished, significantly reducing manufacturing costs while maintaining effective separation of catholyte and anolyte through density-based stratification.
Solution Approach 2:
The patent changes the physical state of the membrane from solid to liquid, and utilizes density parameter differences to achieve automatic stratification and separation. The ionic liquid membrane forms a stable intermediate layer between catholyte and anolyte based on density gradients, eliminating the need for expensive solid membrane materials.
2Ease of manufacture
If membrane-free flow battery is used, then cost is reduced, but crossover of electrochemically active materials occurs
Solution Approach 1:
The patent introduces a liquid membrane as an intermediary substance between catholyte and anolyte. This ionic liquid membrane acts as a mediator that physically separates the two electrolytes while allowing ion transport, preventing direct contact and crossover of electrochemically active materials without requiring expensive solid membranes.
Solution Approach 2:
The patent utilizes hydraulic principles by employing a liquid membrane system that leverages density differences and gravity-driven stratification. The liquid membrane forms stable layers through density gradients, creating a hydraulic barrier that prevents mixing and crossover of active materials while maintaining system openness.
3Reliability
If catholyte and anolyte are made immiscible for automatic isolation, then separation is achieved, but selection range is limited and matching becomes difficult
Solution Approach 1:
The patent uses the liquid membrane as an intermediary layer that enables automatic isolation of catholyte and anolyte without requiring them to be immiscible. This mediator layer allows the use of miscible or partially miscible electrolytes with different compositions, significantly expanding the selection range and flexibility of catholyte-anolyte matching options.
Solution Approach 2:
The patent changes the separation mechanism from relying on immiscibility to relying on density-based stratification. By controlling density parameters of the liquid membrane and electrolytes, the system achieves automatic isolation while allowing wide selection of catholyte and anolyte compositions, including miscible systems that would otherwise mix.
4Quantity of substance
If flow battery is scaled up for large-scale energy storage, then energy storage capacity increases, but managing difficulty and risks increase
Solution Approach 1:
The patent employs a廉价的 liquid membrane system that can be easily prepared, replaced, and maintained. This reduces the complexity and cost of managing large-scale flow battery systems, as the liquid membrane can be quickly replenished without complex replacement procedures, facilitating scalable deployment.
Solution Approach 2:
The patent utilizes adjustable parameters of the liquid membrane system, including thickness, composition, and density, to optimize performance for different scales. This flexibility allows the system to be easily scaled from small to large capacity while maintaining manageable complexity through parameter optimization rather than structural redesign.
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
This solution reduces costs, prevents material crossover, and facilitates large-scale energy storage by allowing flexible matching of catholyte and anolyte, improving the cycle performance and stability of flow batteries.
Implementation Method 1
the two cannot form a homogeneous phase, but will spontaneously stratify to form a biphasic system under the action of gravity according to the difference in density
Implementation Method 2
it dissolves a supporting solute but does not dissolve cathode and anode active materials
Implementation Method 3
the ion exchange liquid membrane can function as a separator to physically separate the catholyte and the anolyte so that the catholyte and the anolyte do not come into contact
Data Source
AI summary
The invention relates to an ion exchange liquid membrane flow battery. The ion exchange liquid membrane separates the catholyte and anolyte by independently stratifying with the catholyte and anolyte, it dissolves the supporting solute but does not dissolve active material in the catholyte and anolyte. The present invention uses the ion exchange liquid membrane to replace the traditional ion exchange solid membrane, solving the problems of high cost and short life of the latter. In addition, the technical solution of the present invention has significant advantages in preventing the crossover of active material due to the adjustable thickness of the ion exchange liquid membrane. Moreover, the technical solution of the present invention can flexibly match all kinds of acidic, neutral, alkaline aqueous or organic catholyte with anolyte according to application requirements, solving the problem of limited catholyte-anolyte match in a conventional flow battery. Furthermore, the technical solution of the present invention is advantageous for multi-cell assembly and large-scale application as the ion exchange liquid membrane has no fixed shape.