Precursor Manufacturing Apparatus for Lithium Battery Cathodes
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Solution Overview
Problem
Existing methods for manufacturing lithium composite transition metal oxides for positive electrode active materials in lithium secondary batteries face challenges in achieving uniform particle size distribution and high productivity, with continuous stirred tank reactors (CSTR) producing non-uniform particles due to variable residence and reaction times, while batch-type reactors have inferior productivity.
Innovation Solution
A manufacturing apparatus and method involving a reactor with a filtration unit to maintain solution level and an extraction unit to control solid concentration, allowing for continuous raw material supply, co-precipitation reaction, and controlled particle size extraction to produce a precursor with a core-shell structure, enhancing both quality and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous stirred tank reactor (CSTR) is used to manufacture precursor for positive electrode active material, then productivity is improved, but particle size uniformity deteriorates
Solution Approach 1:
The CSTR is segmented into multiple zones: a reaction zone where co-precipitation occurs, a settling zone where particles settle, and an overflow zone where supernatant is removed. This segmentation allows continuous operation while maintaining uniform particle size by ensuring complete reaction and separation before discharge.
Solution Approach 2:
The reactor design ensures that raw materials are completely reacted and particles are fully formed before discharge. The settling zone allows particles to settle completely, and the overflow zone removes only supernatant, ensuring that discharged particles have uniform size and complete reaction.
2Manufacturing precision
If a batch-type reactor is used to manufacture precursor for positive electrode active material, then particle size uniformity is improved, but productivity deteriorates
Solution Approach 1:
The reactor enables continuous operation by continuously introducing raw materials, maintaining reaction conditions, and discharging products. The segmented design with settling and overflow zones ensures continuous separation and discharge of uniform particles, eliminating the need for batch processing while maintaining particle size uniformity.
3Productivity
If raw materials are continuously introduced and product discharged simultaneously in CSTR, then productivity is improved, but residence time control deteriorates
Solution Approach 1:
The reactor is divided into reaction zone, settling zone, and overflow zone. This segmentation creates distinct functional areas where residence time can be controlled: the reaction zone ensures complete reaction, the settling zone allows particle separation, and the overflow zone maintains liquid level. This prevents residence time deviation while enabling continuous operation.
Solution Approach 2:
The reactor design incorporates feedback control through the overflow zone that maintains a constant liquid level. This ensures that the residence time of particles in the reaction and settling zones remains consistent, preventing deviation while allowing continuous material introduction and product discharge.
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 achieves uniform particle size distribution and increased production volume, maintaining quality by controlling solid concentration and extending reactor operation time for improved particle growth, resulting in a precursor with excellent lithium mobility and energy density properties.
Implementation Method 1
a reactor configured to receive a reaction solution and produce a precursor for positive electrode active material through a co-precipitation reaction of the reaction solution
Implementation Method 2
a filtration unit disposed inside the reactor and configured to discharge a filtrate excluding solids in the reaction solution to the outside of the reactor
Data Source
AI summary
A manufacturing apparatus of a precursor for positive electrode active material includes a reactor configured to receive a reaction solution and produce a precursor for positive electrode active material through a co-precipitation reaction of the reaction solution, a filtration unit disposed inside the reactor and configured to discharge a filtrate excluding solids in the reaction solution to the outside of the reactor when the reaction solution reaches a predetermined solution level, an extraction unit configured to extract a portion of the reaction solution when the size of a precursor particle in the reaction solution reaches a predetermined size, and a storage tank configured to receive a reaction solution extracted from the reactor through the extraction unit. A method of manufacturing and the precursor are also provided.