Flow Battery Electrolyte Preparation Using In-Situ Vanadium Conversion
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Solution Overview
Problem
The preparation of vanadium-based fluid electrolytes for flow batteries is relatively expensive due to the use of costly materials like vanadyl sulfate, increasing the overall cost of the electrolyte production.
Innovation Solution
In-situ preparation of vanadium-based electrolytes using vanadium oxide powder and a reducing agent, such as oxalic acid, to convert vanadium ions from V4+ to V3+ and V5+, followed by a second conversion to V2+ and V5+, thereby reducing the reliance on expensive ex-situ production methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If expensive materials like vanadyl sulfate are used for electrolyte preparation, then the electrolyte can be produced with the required vanadium ion composition, but the overall production cost increases significantly
Solution Approach 1:
The patent replaces expensive vanadyl sulfate with inexpensive vanadium oxide powder as the starting material. The vanadium oxide is converted to the required vanadium ion composition through electrochemical reactions within the flow battery system, achieving the same functional result at much lower material cost.
Solution Approach 2:
The patent changes the chemical form of vanadium from pre-formed vanadyl sulfate to vanadium oxide powder, and then utilizes electrochemical parameter changes (oxidation states V3+, V4+, V5+) during battery operation to generate the required electrolyte composition in-situ, eliminating the need for expensive starting materials.
2Ease of manufacture
If vanadium oxide powder and reducing agents are used for in-situ electrolyte preparation, then production costs are reduced, but additional chemical processing steps are required
Solution Approach 1:
The flow battery system performs the electrolyte preparation function itself during normal operation. The electrochemical reactions that occur during charging and discharging cycles automatically convert vanadium oxide to the required vanadium ion composition, eliminating the need for separate preparation equipment or complex external processing systems.
Solution Approach 2:
The patent combines the electrolyte preparation function with the battery's normal electrochemical operation. The same electrodes and electrolyte circulation system used for energy storage are also used to generate the required vanadium ion composition, merging two functions into a single integrated system.
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 approach reduces production costs by utilizing inexpensive vanadium oxide and generates electrolytes with predominantly V4+ ions, enhancing the efficiency and cost-effectiveness of electrolyte preparation for flow batteries.
Implementation Method 1
The reducing agent reduces the V5+ to V4+
Implementation Method 2
The vanadium V4+ at the first electrode is converted to vanadium V3+ and the vanadium V4+ at the second electrode is converted to vanadium V5+ by providing electrical energy to the electrodes
Data Source
AI summary
A method of in-situ electrolyte preparation in a flow battery includes providing a vanadium-based electrolyte solution having vanadium ions of predominantly vanadium V4+ to a first electrode and a second electrode of at least one cell of a flow battery. The vanadium V4+ at the first electrode is converted to vanadium V3+ and the vanadium V4+ at the second electrode is converted to vanadium V5+ by providing electrical energy to the electrodes. A reducing agent is then provided to the vanadium V5+ at the second electrode to reduce the V5+ to vanadium V4+. The vanadium V3+ at the first electrode is then converted to vanadium V2+ and the vanadium V4+ at the second electrode is then converted to vanadium V5+ by providing electrical energy to the electrodes. A simple method to produce predominantly vanadium V4+ electrolyte from a V5+ source, such as V2O5, is also taught.