Nickel Cathode Precursor Classification for Uniform Particle Size
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Solution Overview
Problem
Lithium secondary battery positive electrode active materials have room for improvement in terms of battery characteristics, particularly due to impurities and particle size distribution issues in existing precursors.
Innovation Solution
A precursor for lithium secondary battery positive electrodes with a specific particle size distribution and low impurity content, specifically nickel-based compounds with controlled particle diameters and BET specific surface area, produced through a method involving slurry preparation, classification, and calcination, ensuring uniform particle sizes and reduced impurity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a precursor with narrow particle size distribution is used, then battery characteristics are improved, but impurity content increases which degrades battery characteristics
Solution Approach 1:
The classification process is divided into multiple stages with different screen mesh sizes to separately control different particle size ranges. This segmentation allows precise control of particle size distribution while minimizing impurity inclusion at each stage
Solution Approach 2:
The invention changes the classification parameters by using specific screen mesh sizes (150 μm, 75 μm, 45 μm) and adjusting the classification conditions to achieve narrow particle size distribution without trapping impurities. The multi-stage classification with progressively finer meshes optimizes both particle size control and purity
2Manufacturing precision
If multi-stage classification is performed to control particle size distribution, then manufacturing complexity increases, but particle size uniformity is improved
Solution Approach 1:
Multiple classification operations with different screen meshes are combined into an integrated multi-stage classification system. This merging achieves comprehensive particle size control in a unified process flow, improving particle size uniformity while managing complexity through systematic integration
Solution Approach 2:
Different screen mesh sizes are applied at different stages to address specific particle size requirements. The first stage uses 150 μm mesh for coarse classification, the second uses 75 μm for intermediate classification, and the third uses 45 μm for fine classification, with each stage optimized for its specific particle size range
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 proposed solution results in improved battery characteristics, including enhanced cycle performance and reduced impurity content, leading to more efficient charging and discharging processes.
Implementation Method 1
a cumulative particle size distribution curve obtained by measurement with a laser diffraction-type particle size distribution measuring instrument
Data Source
AI summary
A precursor for lithium secondary battery positive electrode active materials containing at least nickel, in which the following formula (1) is satisfied.0.20≤Dmin/Dmax (1)(in the formula (1), Dmin is a minimum particle diameter (μm) in a cumulative particle size distribution curve obtained by measuring the precursor for lithium secondary battery positive electrode active materials with a laser diffraction-type particle size distribution measuring instrument, and Dmax is a maximum particle diameter (μm) in the cumulative particle size distribution curve obtained by the measurement with the laser diffraction-type particle size distribution measuring instrument.).