Lithium Battery Precursor Production via Semi-Continuous Reactor Dynamics
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Solution Overview
Problem
Conventional batch-type methods for preparing positive electrode active material precursors for lithium secondary batteries face challenges in achieving uniform particle size and surface characteristics while maintaining productivity, as they often result in non-uniform particle sizes and reduced productivity compared to continuous stirred tank reactors.
Innovation Solution
A method using a batch-type reactor where a reaction solution with specific flow rate and pH conditions is continuously added and discharged, ensuring the initial input flow rate satisfies 1.5×V/t ≤ υ1+υ2+υ3 ≤ 10×V/t and pH control within specific ranges to facilitate uniform particle formation and increase productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a batch-type reactor is used to prepare positive electrode active material precursor, then particle size control and uniformity are improved, but productivity is significantly reduced
Solution Approach 1:
The patent applies dynamics by implementing a semi-continuous operation mode where reaction solution is continuously added and discharged during the batch reaction process. This dynamic approach allows the reactor to maintain batch-type particle uniformity while achieving continuous material throughput, thereby improving productivity without sacrificing particle size control
Solution Approach 2:
The patent implements continuity of useful action by continuously adding reaction solution and continuously discharging the slurry during the batch reaction. This continuous material flow maintains productivity levels comparable to continuous reactors while the batch reaction mode preserves particle size uniformity, resolving the contradiction between productivity and manufacturing precision
2Productivity
If a continuous stirred tank reactor is used to prepare positive electrode active material precursor, then productivity is improved, but particle size uniformity and surface characteristics deteriorate
Solution Approach 1:
The patent applies dynamics by implementing a semi-continuous operation mode where reaction solution is continuously added and discharged during the batch reaction process. This dynamic approach allows the reactor to maintain batch-type particle uniformity while achieving continuous material throughput, thereby improving productivity without sacrificing particle size control
Solution Approach 2:
The patent applies segmentation by dividing the continuous production process into discrete batch cycles, where each batch maintains uniform reaction conditions for particle formation. The continuous addition and discharge of materials segments the flow into manageable batches, achieving both productivity and uniformity
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 approach allows for the production of positive electrode active material precursors with uniform particle sizes and surfaces, significantly enhancing productivity and preventing defects like nanoflakes, while maintaining reaction conditions similar to continuous stirred tank reactors.
Implementation Method 1
adding the reaction solution while continuously discharging a portion of the reaction solution in the reactor to the outside of the reactor
Implementation Method 2
raw materials are added and co-precipitated
Data Source
AI summary
The present invention provides a method of preparing a positive electrode active material precursor for a lithium secondary battery, a method of preparing a positive electrode active material for a lithium secondary battery in which the positive electrode active material precursor prepared by using the above method is used, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode active material.