Flow Battery Cathodic Wire Arrays for Uniform Metal Plating
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Solution Overview
Problem
Flow battery cells face challenges in achieving uniform metal plating and efficient ion replenishment due to restricted electrolyte flow paths and non-uniform current density distribution, leading to reduced battery efficiency and potential issues like gas evolution, flow blockage, and electrode damage.
Innovation Solution
The use of cathodic wires or slotted sheet cathodes with multiple arrays and open block flow screens in flow battery cells, which allow for improved ion transfer and uniform metal plating by increasing the surface area and optimizing electrolyte flow, thereby enhancing plating rates, morphology, and discharge times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrodes with large surface area are used to minimize cell ohmic resistance, then battery efficiency is improved, but the flow path for electrolyte becomes restricted to narrow channels making it difficult to provide uniform ion replenishment
Solution Approach 1:
The patent divides the planar electrode into multiple three-dimensional wire electrodes arranged in arrays. This segmentation increases the effective surface area for electrochemical reactions while creating open spaces between wires that allow electrolyte to flow uniformly across all electrode surfaces, resolving the contradiction between efficiency and uniformity.
Solution Approach 2:
The patent transitions from two-dimensional planar electrodes to three-dimensional wire electrode structures. This dimensional change increases surface area while simultaneously creating channels for electrolyte flow in multiple directions, enabling uniform ion replenishment across the entire electrode surface.
2Manufacturing precision
If higher electrolyte flow rates are used to increase ion replenishment, then metal plating uniformity is improved, but pumping energy requirements and pressure losses increase
Solution Approach 1:
The wire electrode structure creates locally optimized flow conditions at each wire surface through natural convection and localized turbulence in the narrow gaps between wires. This local quality enhancement provides sufficient ion replenishment without requiring high global flow rates, reducing pumping energy requirements.
3Manufacturing precision
If non-uniform current density distribution occurs during plating, then metal build-up becomes non-uniform over charge/discharge cycles, but achieving uniform current density is difficult with traditional planar electrodes
Solution Approach 1:
Each wire electrode experiences relatively uniform current density distribution due to its small diameter and the uniform electrolyte flow patterns in the gaps between wires. This local quality control at the wire level ensures uniform metal build-up across the entire electrode array over multiple charge/discharge cycles.
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 configuration results in higher cell current density, longer discharge times, and improved battery efficiency with reduced cell voltage drop, while minimizing downtime for electrode maintenance and preventing issues like flow blockage and electrode damage.
Implementation Method 1
When these types of battery cells are charged, a metal (e.g., zinc) is plated onto a planar electrode within the battery cell
Implementation Method 2
The cathodic wires may contain cadmium or a cadmium alloy. The cathodic wires may be solid cadmium wires or may be cadmium plated metallic wires
Implementation Method 3
Each flow battery cell generally contains a cathodic half cell and an anodic half cell separated by an electrolyte membrane which is disposed between the cathodic half cell and the anodic half cell and in fluid communication with a catholyte and an anolyte
Implementation Method 4
a cathode in conductive contact with the catholyte flowing along a catholyte pathway which extends between a catholyte inlet and a catholyte outlet disposed on opposite sides of the cathodic half cell
Implementation Method 5
there is a need for a flow battery cell having an improved ion replenishment (e.g., mass transfer) to the electrode surface
Data Source
AI summary
Embodiments of the invention generally provide for flow battery cells and systems containing a plurality of flow battery cells, and methods for improving metal plating within the flow battery cell, such as by flowing and exposing the catholyte to various types of cathodes. In one embodiment, a flow battery cell is provided which includes a cathodic half cell and an anodic half cell separated by an electrolyte membrane, wherein the cathodic half cell contains a plurality of cathodic wires extending perpendicular or substantially perpendicular to and within the catholyte pathway and in contact with the catholyte, and each of the cathodic wires extends parallel or substantially parallel to each other. In some examples, the plurality of cathodic wires may have at least two arrays of cathodic wires, each array contains at least one row of cathodic wires, and each row extends along the catholyte pathway.