Nickel Hydroxide Precursor Void Control for Lower Battery Resistance
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Solution Overview
Problem
Lithium-nickel composite oxides used in non-aqueous electrolyte secondary batteries face high reaction resistance and inferior cycle characteristics, particularly when exposed to high-temperature environments, limiting their performance and application in mobile and electric vehicle batteries.
Innovation Solution
The development of a positive electrode active material precursor for non-aqueous electrolyte secondary batteries, comprising nickel composite hydroxide particles with controlled void distribution, where the cross-sectional regions have an average void area ratio of 0.5% to 5.0% and a standard deviation of less than 1.0%, facilitating uniform lithium accommodation and ion migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lithium-nickel composite oxide is used as positive electrode material, then cost is reduced compared to lithium-cobalt composite oxide, but cycle characteristics deteriorate and battery performance is impaired in high-temperature environments
Solution Approach 1:
The invention introduces a core-shell structure where the nickel composite oxide core provides cost advantages while the protective coating layer on the surface improves cycle characteristics and thermal stability. This local differentiation of material properties resolves the contradiction between cost reduction and reliability improvement.
Solution Approach 2:
The invention creates a composite structure combining nickel composite oxide with protective materials (such as lithium phosphate, lithium fluoride, or carbon coatings). This composite approach maintains the cost benefits of nickel-based materials while adding the functional properties needed for improved cycle life and high-temperature performance.
2Quantity of substance
If lithium-nickel composite oxide is used as positive electrode material, then capacity is increased, but reaction resistance increases
Solution Approach 1:
The invention introduces a porous coating layer or porous structure on the nickel composite oxide particles that provides multiple pathways for lithium ion diffusion. This porous structure reduces reaction resistance by shortening diffusion paths while maintaining high capacity through increased surface area and improved electrolyte contact.
Solution Approach 2:
The invention modifies surface parameters of the nickel composite oxide by controlling particle size distribution, surface area, and surface chemistry through synthesis conditions. These parameter changes reduce reaction resistance by optimizing the balance between capacity and electrochemical reactivity.
Data Source
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Figure 3A~3B
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, and when the cross section of the nickel composite hydroxide particle is divided into a plurality of regions by boundary lines arranged in a grid such that each of the plurality of regions partitioned by the boundary lines has a size of 2 µm square, an average value of a ratio of an area of the void in an area of each of the plurality of regions partitioned by the boundary lines, is greater than or equal to 0.5% and less than or equal to 5.0%, and a standard deviation of the ratio of the area of the void in the area of each of the plurality of regions partitioned by the boundary lines, is less than or equal to 1.0.