Nickel Precipitation Vessel with Loop Circulation and Separate Stirrer
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Solution Overview
Problem
Existing processes for preparing cathode materials for lithium ion batteries face challenges in achieving high volumetric energy density and efficient processing of cathode layers, particularly in introducing mechanical energy uniformly across large volumes and maintaining controlled flow in reactors.
Innovation Solution
A process for precipitating nickel carbonate or (oxy)hydroxide from an aqueous nickel salt solution using a vessel with elements controlling hydraulic flow and inducing loop-type circulation, combined with a separate stirrer, allows for efficient energy distribution and particle formation with specific morphology and surface properties, enabling the production of high-density cathode materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If homogeneous introduction of large amounts of mechanical energy into large volumes of solutions or suspensions is attempted, then particle morphology and surface properties can be improved, but apparatus complexity and difficulty of implementation increase significantly
Solution Approach 1:
The vessel is segmented into distinct functional zones: a reaction zone where precipitation occurs and a circulation zone where slurry is pumped and returned. This segmentation allows mechanical energy to be introduced efficiently in the circulation zone while maintaining controlled conditions in the reaction zone, improving particle morphology without excessive apparatus complexity.
Solution Approach 2:
Different regions of the vessel have different flow characteristics and energy input levels. The circulation zone receives high mechanical energy input through the pump to achieve desired particle properties, while the reaction zone maintains more gentle conditions for controlled precipitation. This local differentiation of quality allows optimization of both particle morphology and process control.
2Manufacturing precision
If high mechanical power input is applied to produce homogeneously mixed reaction zones, then product suspension quality improves, but energy consumption increases
Solution Approach 1:
The circulation pump continuously recirculates the slurry from the reaction zone back through the circulation zone, maintaining continuous mixing and particle formation. This continuous action ensures homogeneous product suspension quality while distributing energy input over time, reducing peak energy consumption compared to intermittent high-power mixing.
3Productivity
If compartmentalized vessels with multiple reaction zones are used, then precipitation efficiency improves, but device complexity and scalability difficulties increase
Solution Approach 1:
The invention merges the reaction zone and circulation zone into a single integrated vessel design. The circulation pump and return path are configured to work within the same vessel space, combining multiple functions (precipitation, mixing, particle formation) in one unit. This reduces structural complexity compared to separate compartmentalized vessels while maintaining high precipitation efficiency through the circulation mechanism.
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 process achieves high-density cathode materials with controlled particle size and morphology, enhancing the energy density and cycling stability of lithium ion batteries while minimizing energy input, making it suitable for both batch and continuous processes.
Implementation Method 1
elements that control the hydraulic flow of the slurry formed during the precipitation and that induce a loop-type circulation flow
Implementation Method 2
a stirrer whose stirrer element is in the vessel but located separately from the element(s) (B)
Implementation Method 3
process for precipitating a carbonate or (oxy)hydroxide comprising nickel from an aqueous solution of a nickel salt
Data Source
AI summary
Process for precipitating a carbonate or (oxy)hydroxide comprising nickel from an aqueous solution of a nickel salt wherein such process is carried out in a vessel comprising (A) a vessel body, (B) one or more elements that control the hydraulic flow of the slurry formed during the precipitation and that induce a loop-type circulation flow, and (C) a stirrer whose stirrer element is in the vessel but located separately from the element(s) (B).