Nickel Hydroxide Precursor Void Distribution for Stable Battery Cycling
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Solution Overview
Problem
Lithium-nickel composite oxides used in non-aqueous electrolyte secondary batteries suffer from inferior cycle characteristics, particularly when exposed to high-temperature environments, limiting their performance and durability.
Innovation Solution
The development of a positive electrode active material precursor for non-aqueous electrolyte secondary batteries, comprising nickel composite hydroxide particles with controlled voids, where the area ratio of voids to the particle cross-section is less than 5.0% and to a circular region with a 1.78 µm radius is less than 20%, ensuring uniform lithium distribution and improved cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a lithium-nickel composite oxide is used as positive electrode material, then the battery cost is reduced and capacity is increased, but the cycle characteristics are inferior and battery performance is impaired by high-temperature environments
Solution Approach 1:
The invention changes the physical and chemical parameters of the nickel composite hydroxide particles, specifically controlling the void area ratio to be 5.0% or less and the circular region void ratio to be 20% or less. These parameter changes in the precursor material lead to improved cycle characteristics while maintaining high capacity, resolving the contradiction between battery capacity and reliability
Solution Approach 2:
The invention applies local quality control by specifically managing the void distribution within the nickel composite hydroxide particles. By controlling the void area ratio locally within the particle structure, the invention achieves uniform lithium distribution in critical regions, thereby improving cycle characteristics without sacrificing overall battery capacity
2Quantity of substance
If a lithium-nickel composite oxide is used as positive electrode material, then the battery cost is reduced, but the battery performance is easily impaired by high-temperature environments
Solution Approach 1:
The invention changes the structural parameters of the nickel composite hydroxide particles by controlling the void area ratio to be 5.0% or less. This parameter change creates a more stable particle structure that resists degradation under high-temperature conditions, thereby reducing the harmful effects of thermal environments while maintaining the cost advantage of nickel-based materials
3Stability of the object's composition
If nickel composite hydroxide particles with voids are used as precursor, then lithium distribution becomes uniform, but manufacturing precision requirements increase
Solution Approach 1:
The invention establishes specific parameter ranges for the void area ratio (5.0% or less) and circular region void ratio (20% or less) in the nickel composite hydroxide particles. By defining these quantitative parameters, the invention provides clear manufacturing targets that balance lithium distribution uniformity with achievable manufacturing precision, avoiding overly stringent requirements while ensuring performance
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 precursor enhances the cycle characteristics of the batteries by preventing uneven lithium distribution, reducing lithium components that do not contribute to charging and discharging, thereby improving the battery's overall performance.
Implementation Method 1
a cross section of each nickel composite hydroxide particle includes voids, a ratio of an area of the voids to the cross section of the nickel composite hydroxide particle is less than or equal to 5.0%
Data Source
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AI summary
A positive electrode active material precursor for a non-aqueous electrolyte secondary battery, including a nickel composite hydroxide particle, is provided, wherein a cross section of the nickel composite hydroxide particle includes a void, a ratio of an area of the void to the cross section of the nickel composite hydroxide particle is less than or equal to 5.0%, a circular region having a radius of 1.78 µm is set at a position where a ratio of an area of the void to the circular region is maximum, on the cross section of the nickel composite hydroxide particle, and the ratio of the area of the void to the circular region is less than or equal to 20%.