Transition Metal Hydroxide Particle Control via Recirculation
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Solution Overview
Problem
Current processes for producing transition metal hydroxides face challenges in introducing larger amounts of mechanical energy into large volumes, which affects the morphology and surface properties of the resulting materials, essential for improving lithium-ion battery performance.
Innovation Solution
A process involving the combination of transition metal salt and alkali metal hydroxide solutions in a stirring vessel, with continuous mechanical power input of 50 to 10,000 W/l into a portion of the suspension, which is then recirculated, to control the morphology and surface properties of the hydroxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If larger amounts of mechanical energy are introduced into large volumes of suspension, then the morphology and surface properties of transition metal hydroxides are improved, but it becomes difficult in terms of apparatus
Solution Approach 1:
The suspension processing is divided into two separate compartments: a first compartment for precipitation and a second compartment for high-power mechanical energy input. This segmentation allows each compartment to be optimized for its specific function, avoiding the need for a single complex apparatus that would need to handle both low-power mixing and high-power energizing of large volumes.
Solution Approach 2:
A portion of the suspension acts as an intermediary carrier between the two compartments. The suspension is circulated from the first compartment to the second compartment, where it receives mechanical energy input, and then returns to the first compartment. This intermediary approach allows high-power energy input to be achieved in a small volume (the circulated portion) while treating large volumes of suspension overall.
2Manufacturing precision
If mechanical power in the range of 50 to 10,000 W/l is introduced into a portion of the suspension, then the average particle diameter is controlled at 6 to 12 μm, but this requires a two-compartment system with recirculation
Solution Approach 1:
The system is segmented into a first compartment for precipitation and a second compartment for particle size control through high-power mechanical energy input. This allows precise control of average particle diameter (6 to 12 μm) in the second compartment while maintaining the overall precipitation process in the first compartment.
Solution Approach 2:
A portion of the suspension is continuously circulated from the first compartment to the second compartment and back, ensuring continuous mechanical energy input. This continuous circulation maintains the desired particle size distribution while allowing the overall process to run continuously without interruption.
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 method produces transition metal hydroxides with a controlled average particle diameter of 6 to 12 µm, enhancing their suitability as electrode materials for lithium-ion batteries by improving energy density and processing ease.
Implementation Method 1
combining at least one solution of at least one transition metal salt with at least one solution of at least one alkali metal hydroxide in a stirring vessel and thereby producing an aqueous suspension of transition metal hydroxide
Implementation Method 2
in at least one further compartment a mechanical power in the range of 50 to 10,000 W/l is continuously introduced into a portion of the suspension, based on the portion of the suspension, and then the portion into that Mixing vessel returns
Data Source
AI summary
The invention relates to a method for producing transition metal hydroxides with an average particle diameter ranging from 6 to 12 μm (D50). The invention is characterized in that at least one solution of at least one transition metal salt is combined with at least one solution of at least one alkali metal hydroxide in a mixing vessel, thereby producing an aqueous suspension of transition metal hydroxide, and a mechanical energy output is continuously introduced into a fraction of the suspension in each of at least one additional compartment, the mechanical energy output ranging from 50 to 10,000 W/l with respect to said fraction of the suspension. The fraction is then returned into the mixing vessel.