Nickel Hydroxide Particle Growth via High Flow Acceleration
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Solution Overview
Problem
The production of nickel-containing hydroxide particles for lithium ion secondary batteries often results in sphericity degradation, which affects the battery's characteristics, and existing methods require specific agitation apparatus setups, making it challenging to maintain consistent particle quality across different chemical reaction apparatuses.
Innovation Solution
A method involving a particle growth step in an aqueous solution with an average maximum acceleration of streamlines greater than 600 m/s² is used to promote nickel-containing hydroxide particle growth, preventing sphericity degradation and ensuring consistent particle quality across various agitation apparatus structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If neutralization crystallization is performed in an agitation tank with conventional agitation conditions, then nickel-containing hydroxide particles can be produced, but sphericity degradation occurs affecting battery characteristics
Solution Approach 1:
The invention changes the flow acceleration parameter by controlling agitation speed and impeller design to achieve an average maximum flow acceleration of 500-2000 m/s². This parameter change prevents particle aggregation and maintains spherical shape during neutralization crystallization, thereby preventing sphericity degradation while ensuring consistent battery characteristics.
2Manufacturing precision
If specific agitation apparatus setups are used to maintain particle quality, then manufacturing consistency can be achieved, but device complexity and adaptability to different apparatuses are reduced
Solution Approach 1:
The invention establishes a universal agitation condition based on flow acceleration rather than specific apparatus geometry. By specifying that the average maximum flow acceleration should be 500-2000 m/s² regardless of impeller type or tank size, the method can be applied to various agitation apparatus configurations while maintaining consistent particle quality, thereby achieving universality across different device designs.
3Ease of manufacture
If conventional agitation conditions are used, then production can proceed with standard equipment, but particle sphericity degrades affecting the positive electrode active material quality
Solution Approach 1:
The invention maintains ease of manufacture by using conventional neutralization crystallization processes but introduces a specific flow acceleration parameter (500-2000 m/s²) as the controlling variable. This parameter can be achieved by adjusting agitation speed in standard equipment, allowing simple implementation without complex apparatus modifications while significantly improving particle sphericity and preventing degradation.
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 method effectively prevents sphericity degradation of nickel-containing hydroxide particles, enhancing the characteristics of lithium ion secondary batteries and allowing for universal application across different chemical reaction apparatuses.
Implementation Method 1
a particle growth step of promoting growth of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution
Implementation Method 2
an averaged value of the maximum accelerations of the flows of streamlines for the aqueous solution in the agitation tank is greater than 600 m/s²
Data Source
AI summary
A method for producing a nickel-containing hydroxide is provided that includes a particle growth step of promoting growth of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank. In the particle growth step, an averaged value of the maximum accelerations of the flows of streamlines for the aqueous solution is greater than 600 m/s2.