Nickel Hydroxide Particle Morphology for Better Sieve Yield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing nickel composite hydroxides with plate-shaped secondary particles have poor yield due to difficulty in passing through sieves, limiting their productivity in the production of non-aqueous electrolyte secondary batteries.
Innovation Solution
A nickel-containing hydroxide with a maximum peak frequency of 4.60% or more in aspect ratio distribution, optimized through controlled coprecipitation methods, including specific ammonia percentages in the gas phase, to enhance yield and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If plate-shaped secondary particles are formed by agglomeration of plate-shaped primary particles, then surface area is increased for high output characteristics and battery capacity, but passage through sieve is poor resulting in reduced yield
Solution Approach 1:
The patent applies spheroidality by controlling the aspect ratio of secondary particles to be 0.05 or more, moving away from highly plate-shaped morphology toward more spherical forms. This curvature modification enables particles to pass through sieves more effectively while maintaining sufficient surface area for battery performance, thus resolving the contradiction between surface area and passage through sieve.
2Length of moving object
If plate-shaped particles with high aspect ratio are used, then electrode thickness can be reduced and output improved, but productivity is limited due to poor sieve passage
Solution Approach 1:
The patent applies parameter changes by optimizing the aspect ratio parameter to be 0.05 or more, which balances the particle morphology to achieve both reduced electrode thickness and improved productivity. This parameter optimization allows particles to maintain the dimensional characteristics needed for thin electrodes while having sufficient roundness to pass through sieves efficiently.
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 optimized nickel-containing hydroxide exhibits improved yield and productivity, enabling better filling properties and thermal conductivity, suitable for use as a precursor in positive electrode active materials for non-aqueous electrolyte secondary batteries.
Implementation Method 1
The nickel-containing hydroxide with the maximum peak value of the frequency of 4.60% or more in the aspect ratio measurement can be produced with improved yield and productivity
Data Source
AI summary
Provided is a nickel-containing hydroxide which is a precursor of a positive electrode active material for a non-aqueous electrolyte secondary battery, wherein in the frequency distribution in the aspect ratio measurement of secondary particles of the nickel-containing hydroxide, the maximum peak value of the frequency is 4.60% or more.