Solid-State Battery Cathode Composition for Dense Low-Resistance Electrodes

The patent applies local quality by creating a core-shell structure where the core contains small particles for high ionic conductivity and the shell contains large particles for high mixture density. This allows different regions of the same particle to have different properties, resolving the contradiction between ionic conductivity and mixture density.

The patent uses composite materials by combining small-particle and large-particle positive active materials within the same electrode structure. The small particles provide high ionic conductivity while the large particles maintain high mixture density, creating a composite system that achieves both benefits simultaneously.

The core-shell structure allows small particles in the core to provide high ionic conductivity while the shell structure manages resistance issues. The differentiated structure enables local optimization where small particles benefit ionic conductivity without proportionally increasing overall resistance.

By combining small and large particles in a composite structure, the patent achieves high ionic conductivity from the small particles while the overall composite structure maintains lower resistance through the synergistic effect of both particle sizes, preventing the resistance increase that would occur with small particles alone.

The core-shell structure with small core particles enables high-rate characteristics through fast ion transport, while the shell structure provides structural stability that extends lifespan. This local differentiation allows the electrode to achieve both high-rate performance and long cycle life.

The composite of small and large particles creates a synergistic effect where small particles facilitate fast charge/discharge rates while the overall composite structure maintains structural integrity over time, achieving both high-rate characteristics and extended lifespan that neither particle size could achieve alone.