Ni-Uniform Metal Composite Compound for Battery Charge Efficiency
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Solution Overview
Problem
There is a demand for improving the initial charge/discharge efficiency of lithium secondary batteries as their applications expand.
Innovation Solution
A metal composite compound (MCC) is formulated with specific particle size and Ni content ratio uniformity, characterized by a slope S of -0.2 to 0.2, standard deviation X of 2.0 mol% or less for D10 particles, and ratio X/Y of 7.0 or less, ensuring uniform Ni distribution across different particle sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal composite compounds are used as raw materials, then battery performance can be improved to some extent, but the initial charge/discharge efficiency remains insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Ni content ratio distribution across different particle sizes. Specifically, it sets the slope S of the approximate straight line in the scatter plot to be between -0.2 and 0.2, and controls the standard deviation X of Ni content ratio in particles with D10 or less to be 2.0 mol% or less. This quantitative parameter control transforms the Ni distribution to achieve both improved initial charge/discharge efficiency and uniform composition, resolving the contradiction between reliability and manufacturing precision.
Solution Approach 2:
The patent applies local quality by differentiating the Ni content control strategy across different particle size ranges. It specifically targets particles with D10 or less (small particles) and particles with D50 or more (large particles) with different standard deviation requirements (X ≤ 2.0 mol% and Y respectively), allowing optimized Ni distribution tailored to each particle size category's contribution to battery performance.
2Ease of manufacture
If Ni content ratio varies across particle sizes, then manufacturing is easier, but initial charge/discharge efficiency decreases
Solution Approach 1:
The patent establishes specific parameter ranges for Ni content distribution: slope S between -0.2 and 0.2, standard deviation X ≤ 2.0 mol% for D10 particles, and ratio X/Y ≤ 7.0. These parameter specifications provide clear manufacturing targets that balance ease of production with performance requirements, transforming the vague goal of 'uniform Ni distribution' into quantifiable control parameters.
Solution Approach 2:
The patent employs feedback by using scatter plot analysis with defined parameters (slope S, standard deviations X and Y, ratio X/Y) to evaluate and adjust the Ni content distribution. This quantitative feedback mechanism allows manufacturers to measure actual Ni distribution, compare it against target parameters, and make precise adjustments to achieve optimal initial charge/discharge efficiency.
Data Source
AI summary
A metal composite compound includes at least Ni. In a scatter plot obtained by measuring a powder of the metal composite compound using a scanning electron microscope-energy dispersive X-ray spectroscopy, with a horizontal axis representing a projected area circle equivalent diameter (μm) of particles of the metal composite compound and a vertical axis representing an Ni content ratio (mol %) of the particles of the metal composite compound, a slope S of an approximate straight line calculated by a least squares method is −0.2 or more and 0.2 or less. When a particle diameter at which a cumulative volume ratio from a small particle side in a volume-based particle size distribution reaches 10% is defined as D10 (μm), a standard deviation X of the Ni content ratio (mol %) in particles having a projected area circle equivalent diameter of the D10 (μm) or less is 2.0 mol % or less.