Titanyl Sulfate Hydrate Powder for Fast Electrolyte Dissolution
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Solution Overview
Problem
Conventional methods for producing titanyl sulfate crystals result in low dissolution rates, making it time-consuming to prepare high-concentration aqueous solutions required for redox flow batteries, especially when niobium content is low or seed crystals are not used.
Innovation Solution
A titanyl sulfate hydrate powder with specific composition and crystal structure is produced, allowing for rapid dissolution in water, comprising 25-40% titanium, 40-60% sulfur, and controlled niobium content, along with a method involving seed crystals and controlled heating to achieve high concentration aqueous solutions efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce titanyl sulfate crystals, then the crystals can be obtained, but the dissolution rate is low and it takes a long time to prepare high-concentration aqueous solutions
Solution Approach 1:
The patent changes the chemical composition parameters of titanyl sulfate by controlling the molar ratio of sulfur to titanium (S/Ti = 1.05-1.30) and the niobium content (Nb/Ti = 0.001-0.01). These parameter changes result in a crystal structure with improved dissolution properties, allowing rapid dissolution in water to achieve high-concentration aqueous solutions (200-400 g/L) within a short time without requiring seed crystals or extended dissolution periods
2Quantity of substance
If high concentration of metal ions is used to increase energy density, then the energy density per unit area increases, but solid MnO2 is deposited during charge and discharge
Solution Approach 1:
The patent introduces titanyl sulfate as an intermediary substance that prevents the harmful deposition of solid MnO2. The titanyl sulfate acts as a mediator in the electrochemical reactions, allowing high concentrations of metal ions (200-400 g/L) to be used for high energy density while the titanyl sulfate prevents MnO2 precipitation during charge and 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
The titanyl sulfate hydrate powder enables the rapid production of high-concentration aqueous solutions, enhancing the efficiency and productivity of electrolytes for redox flow batteries, thereby improving battery performance and capacity.
Implementation Method 1
adding, to an aqueous solution containing 50 to 300 g/L of titanium element in terms of TiO2, 650 to 1200 g/L of sulfur element in terms of H2SO4, and niobium element in such an amount that a molar ratio of niobium element to titanium element (Nb/Ti) is 0.0005 to 0.02, seed crystals of titanyl sulfate dihydrate (TiOSO4·2H2O) containing titanium element in the mole number of 0.003 to 0.05 times to the mole number of titanium element in the aqueous solution, and heating the mixture at 50 to 120° C. to deposit crystals of titanyl sulfate hydrate
Implementation Method 2
A titanyl sulfate hydrate powder which is dissolved in water at a high rate, so that a high concentration aqueous solution can be produced with high productivity
Data Source
AI summary
There is provided a titanyl sulfate hydrate powder comprising 25 to 40% by mass of titanium element in terms of TiO2, 40 to 60% by mass of sulfur element in terms of H2SO4, and niobium element in such an amount that a molar ratio of niobium element to titanium element (Nb/Ti) is 0.00005 to 0.012, with a molar ratio of the sulfur element content to the titanium element content (S/Ti) being 1.1 to 1.5, and comprising crystalline titanyl sulfate dihydrate (TiOSO4·2H2O). Thus, the present invention can provide a titanyl sulfate hydrate powder with a high dissolution rate in water and a production method therefor, as well as a method for producing an aqueous titanyl sulfate solution, a method for producing an electrolyte and a method for producing a redox flow battery, using the titanyl sulfate hydrate powder.