Nickel Hydroxide Particle Growth via Supersaturation Control
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Solution Overview
Problem
The production of nickel-containing hydroxide particles for lithium ion secondary batteries often results in particles with growth ring-like structures, which can degrade battery performance and are affected by the structure of the chemical reaction apparatus, requiring specific setup conditions for each apparatus.
Innovation Solution
A method involving neutralization crystallization in an aqueous solution with a volume fraction of the highly supersaturated region less than 0.624% to prevent the formation of particles with growth ring-like structures, allowing for universal application across various chemical reaction apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If neutralization crystallization is performed in an agitation tank with conventional setup conditions, then nickel-containing hydroxide particles can be produced, but particles with growth ring-like structures are formed which degrade battery performance
Solution Approach 1:
The invention changes the concentration parameters of the aqueous solution during neutralization crystallization. Specifically, it controls the nickel ion concentration to be 0.5-5 mol/L and the hydroxide ion concentration to be 0.1-5 mol/L, maintaining a concentration ratio that prevents growth ring formation. This parameter optimization resolves the contradiction by achieving both uniform particle structure and high battery performance.
2Manufacturing precision
If specific setup conditions are used for each chemical reaction apparatus structure, then particle production can be controlled, but the process lacks universality across different apparatuses
Solution Approach 1:
The invention establishes universal concentration ratios of nickel ions to hydroxide ions (1:0.2 to 1:2) that can be applied across different agitation tank apparatuses regardless of their specific structural differences. This universal ratio control method enables consistent particle formation control in various apparatus configurations, resolving the contradiction between precision control and apparatus adaptability.
3Productivity
If high concentration of nickel ions is used to increase production efficiency, then productivity improves, but growth ring-like structures are more likely to form
Solution Approach 1:
The invention optimizes the concentration parameters by setting nickel ion concentration at 0.5-5 mol/L and hydroxide ion concentration at 0.1-5 mol/L, with a controlled ratio between them. This allows high productivity through adequate nickel ion concentration while preventing growth ring formation by maintaining the proper concentration balance, thus resolving the contradiction between production efficiency and particle structure 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 method ensures the production of nickel-containing hydroxide particles without growth ring-like structures, improving battery performance and allowing for consistent production across different apparatus structures.
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
a volume fraction of a highly supersaturated region in the aqueous solution where the molar concentration of the nickel-containing hydroxide dissolved in the aqueous solution is greater than or equal to 1.7 mol/m3
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, a volume fraction of a highly supersaturated region in the aqueous solution where the molar concentration of the nickel-containing hydroxide dissolved in the aqueous solution is greater than or equal to 1.7 mol/m3 is less than 0.624% of the aqueous solution.