Titanium Catechol Complex Synthesis via Extraction
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Solution Overview
Problem
Current methods for synthesizing titanium catechol complexes are not viable for commercial-scale energy storage applications due to issues with extraneous salt production, low solubility, and high synthesis costs, which affect the efficiency and cycle life of flow batteries.
Innovation Solution
A method involving the formation of a catechol solution with an organic solvent, reacting a titanium reagent with the catechol compound to create an intermediate complex, separating byproducts, and converting the complex into a salt form using an alkaline aqueous solution to produce titanium catechol complexes with minimal extraneous salts, enhancing solubility and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods are used to synthesize titanium catechol complexes, then the complexes can be produced, but extraneous salts are generated that reduce solubility and increase cost
Solution Approach 1:
The patent applies extraction by removing the harmful byproduct (extraneous salt) from the synthesis process. The new method uses a titanium reagent that reacts with catechol to form the desired complex while producing volatile byproducts that can be easily removed, rather than generating non-volatile extraneous salts that contaminate the product and reduce solubility.
Solution Approach 2:
The patent changes the chemical parameters of the synthesis process by using a specific titanium reagent (such as titanium tetrachloride or titanium alkoxide) instead of conventional titanium salts. This parameter change in the reagent type fundamentally alters the reaction pathway to avoid generating extraneous salts, thereby improving both solubility and production viability.
2Quantity of substance
If organic active materials are used to compensate for low solubility, then solubility increases, but synthesis costs and environmental issues increase
Solution Approach 1:
The patent changes the chemical composition parameters by synthesizing titanium catechol complexes with specific ligand structures that inherently provide high solubility in aqueous media. This eliminates the need to use expensive organic active materials while maintaining high solubility, thereby reducing both synthesis costs and environmental impact.
3Reliability
If titanium complexes are used as active materials, then good half-cell potentials and current efficiencies are achieved, but conventional synthesis methods produce extraneous salts that limit commercial viability
Solution Approach 1:
The patent removes the production of extraneous salts from the synthesis process by using a redesigned reaction pathway. The new method produces only volatile byproducts that can be completely removed, leaving pure titanium catechol complexes suitable for commercial-scale production in flow batteries without the contamination issues that limit productivity.
Solution Approach 2:
The patent creates a simplified version of the synthesis process that copies only the essential features needed to produce high-performance titanium complexes while eliminating the problematic salt formation step. This streamlined process enables commercial-scale production by removing the bottleneck of salt removal and purification.
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 method allows for the production of high-purity titanium catechol complexes in large quantities, reducing extraneous salt formation and improving solubility, thus enhancing the energy storage performance and cycle life of flow batteries.
Implementation Method 1
coordination complexes for this purpose. As used herein, the terms 'coordination complex,' 'coordination compound,' 'metal-ligand complex,' or simply 'complex' synonymously refer to a compound having at least one covalent bond formed between a metal center and a donor ligand
Implementation Method 2
combining an alkaline aqueous solution containing a base with the intermediate titanium catechol complex. The base converts the intermediate titanium catechol complex into a salt form titanium catechol complex that is at least partially dissolved in an aqueous phase
Data Source
AI summary
Titanium complexes containing at least one catecholate ligand can be desirable active materials for flow batteries and other electrochemical energy storage systems. Such complexes can be formed through reacting a catechol compound with a titanium reagent in an organic solvent, removing a byproduct species, and then obtaining an aqueous phase containing a salt form of the titanium catechol complex, particularly an alkali metal salt form. More specifically, the methods can include: forming a catechol solution containing a catechol compound and an organic solvent, contacting a titanium reagent with the catechol solution to form a reaction mixture, reacting the titanium reagent with the catechol compound to form an intermediate titanium catechol complex and a byproduct species, separating the byproduct species, and combining an alkaline aqueous solution containing a base with the intermediate titanium catechol complex to produce a salt form titanium catechol complex at least partially dissolved in an aqueous phase.