Double Cylindrical Rotation Crystallizer for Battery Precursors
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Solution Overview
Problem
Conventional solid synthesis methods for lithium secondary battery cathode active materials require high temperatures and multiple thermal treatment and grinding processes, leading to increased thermal treatment time and difficulties in achieving uniform particle size and reproducibility.
Innovation Solution
A double cylindrical rotation crystallizer apparatus is used to facilitate the preparation of cathode active material precursors for lithium secondary batteries by forming ring-shaped vortex pairs through the rotation of an inner cylinder within a cylindrical outer chamber, allowing for uniform mixing and shortening reaction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid synthesis method is used with high temperature thermal treatment, then cathode active material can be synthesized, but thermal treatment time increases and particle size uniformity deteriorates
Solution Approach 1:
The invention changes the physical state of reactants from solid to liquid, enabling reaction at lower temperatures (80-90°C vs 800-1000°C) and dramatically reducing reaction time from 20-24 hours to 10-60 minutes while achieving uniform particle size distribution
Solution Approach 2:
The invention introduces a liquid medium (water or alcohol) as an intermediary to dissolve reactants and facilitate uniform mixing, enabling homogeneous precursor formation and controlled precipitation that leads to uniform particles without prolonged high-temperature treatment
2Stability of the object's composition
If multiple thermal treatment and grinding processes are performed, then homogeneity is controlled, but process complexity increases
Solution Approach 1:
The invention performs preliminary mixing of reactants in liquid phase before reaction, ensuring homogeneous distribution of metal ions in the precursor solution, which eliminates the need for subsequent grinding and multiple thermal treatment cycles to achieve uniformity
Solution Approach 2:
The invention combines mixing, reaction, and precipitation steps into a single integrated liquid-phase process, replacing the separate thermal treatment and grinding operations with one continuous synthesis step that achieves both homogeneity and particle formation simultaneously
3Temperature
If co-precipitation method is used, then synthesis can be performed at lower temperature, but particle size uniformity deteriorates due to fine particles and wide distribution
Solution Approach 1:
The invention introduces dynamic mechanical agitation during the precipitation process to control nucleation and growth rates, preventing excessive fine particle formation and achieving uniform particle size distribution while maintaining low synthesis temperature
Solution Approach 2:
The invention employs periodic addition of precipitating agent and controlled agitation patterns to manage the precipitation process, ensuring uniform nucleation and growth that produces consistent particle sizes without requiring high temperature treatment
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 apparatus enables the production of cathode active material precursors with uniform particle size and superior properties, enhancing mass-production capabilities and reproducibility while reducing synthesis time.
Implementation Method 1
forming ring-shaped vortex pairs through the rotation of an inner cylinder within a cylindrical outer chamber
Data Source
AI summary
Provided are an apparatus for preparing a cathode active material precursor for lithium secondary batteries including a cylindrical outer chamber, an inner cylinder that has the same central axis as the outer chamber and is mounted to rotatably move along the central axis, an electric motor to transfer power to rotate the inner cylinder, a reactant inlet disposed on the outer chamber, to add reactants to a space between the outer chamber and the inner cylinder, and an outlet disposed in the outer chamber, to obtain reaction products after reaction in the space between the outer chamber and the inner cylinder, and a method for preparing a cathode active material precursor for lithium secondary batteries using the apparatus.