O2-Type Cathode Particles With Hollow Spheres for Lower Resistance
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Solution Overview
Problem
Conventional positive electrode active materials with an O2-type structure exhibit high resistance and suboptimal rate characteristics when used in solid and liquid-based batteries, respectively.
Innovation Solution
A manufacturing method involving the ion exchange of Na-containing oxide particles with Li to produce Li-containing oxide particles with a hollow single-layer or multilayer structure, specifically tailored for solid and liquid-based batteries, where the particles have a controlled average diameter and specific surface area to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional positive electrode active materials with O2-type structure are used, then the battery can be manufactured with standard materials, but the resistance is high and rate characteristics are poor
Solution Approach 1:
The patent employs hollow spherical particles with porous shell structures as positive electrode active materials. The hollow interior and porous morphology provide increased surface area for electrochemical reactions while maintaining low density, thereby improving rate characteristics and reducing resistance without compromising structural integrity
Solution Approach 2:
The patent systematically varies key parameters including particle size (0.1-10 μm), shell thickness, hollow cavity diameter, and porosity to optimize performance. By controlling these parameters during synthesis, the material achieves both low resistance and excellent rate characteristics that conventional dense materials cannot attain
2Reliability
If ion exchange of Na-containing oxide particles with Li is performed, then Li-containing oxide particles with hollow structure are obtained, but the manufacturing process becomes more complex
Solution Approach 1:
The patent performs ion exchange treatment during the particle synthesis process itself, rather than as a separate post-processing step. By incorporating the ion exchange into the formation stage, the manufacturing process complexity is minimized while still achieving the desired Li-containing oxide composition and hollow structure
Solution Approach 2:
The patent uses a molten salt medium as an intermediary to facilitate the ion exchange process. The molten salt enables efficient Na-Li ion exchange at relatively low temperatures and pressures, simplifying the overall manufacturing process while ensuring complete ion substitution and homogeneous distribution of Li ions in the final product
3Stability of the object's composition
If spherical particles with controlled diameter are used, then the packing density and electrode structure are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs a surfactant-mediated precipitation method that inherently promotes the formation of spherical particles. The surfactant molecules act as structure-directing agents during nucleation and growth, ensuring uniform spherical morphology with narrow size distribution, thereby reducing manufacturing precision requirements while maintaining stable particle structure
Solution Approach 2:
The patent implements in-situ monitoring of particle size and morphology during the synthesis process using light scattering or microscopy techniques. Real-time feedback allows dynamic adjustment of synthesis parameters (temperature, pH, addition rate) to maintain consistent spherical particle formation within target diameter specifications, reducing the need for post-synthesis sorting and rework
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 method results in positive electrode active materials with reduced resistance and improved rate characteristics for solid batteries and enhanced performance in liquid-based batteries, respectively.
Implementation Method 1
subjecting at least a portion of Na in the Na-containing oxide particles to ion exchange with Li to obtain Li-containing oxide particles having an O2-type structure
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3~4
AI summary
Disclosed is a manufacturing method for a positive electrode active material having an O2-type structure and having low resistance when applied to a solid battery. The manufacturing method of the present disclosure is a manufacturing method for a positive electrode active material used in solid batteries, comprising obtaining Na-containing oxide particles having a P2-type structure, and subjecting at least a portion of Na in the Na-containing oxide particles to ion exchange with Li to obtain Li-containing oxide particles having an O2-type structure, wherein the Na-containing oxide particles are spherical particles having an average particle diameter of 1.0 µm or more and less than 3.5 µm, and the Li-containing oxide particles are spherical particles having a hollow single-layer structure.