Spinel Positive Electrode Material for Low Voltage Drop Batteries

The patent applies parameter changes by precisely controlling the cation mixing ratio to fall within the specific range of 10-30%, and by controlling particle size distribution (D50: 3-6 μm, D100: ≤15 μm). These parameter optimizations reduce voltage drop during charge-discharge cycles while maintaining manufacturing feasibility through controlled synthesis conditions.

The patent creates a composite structure with core-shell configuration where the core contains spinel lithium manganese oxide with controlled cation mixing and the shell contains a protective coating layer. This composite structure reduces voltage drop by preventing direct contact between the active material and electrolyte, while the controlled cation mixing in the core maintains structural stability.

The patent optimizes the cation mixing ratio to a specific range of 10-30%, which is sufficient to create lithium diffusion pathways but not so high as to cause severe crystal structure distortion. This parameter optimization simultaneously achieves high battery capacity and maintains crystal structure stability during repeated charge-discharge cycles.

The patent employs a core-shell composite structure where the core contains spinel lithium manganese oxide with controlled cation mixing (10-30%) for high lithium diffusion, and the shell contains a protective coating that stabilizes the crystal structure. This composite approach allows the core to provide high capacity while the shell maintains structural integrity.

The patent applies local quality by creating a non-uniform particle size distribution where D50 is controlled at 3-6 μm for high reaction efficiency, while D100 is kept ≤15 μm to prevent excessive surface area that would cause structural instability. The protective shell coating is applied preferentially on the particle surface to provide localized structural support where it is most needed.

The patent uses a core-shell composite structure where small particles (D50: 3-6 μm) provide high surface area and reaction efficiency, while the protective shell coating on each particle maintains individual structural stability. The shell acts as a buffer that prevents structural degradation even when particles are small.

The patent optimizes the cation mixing ratio to 10-30%, which creates a more stable crystal structure that can withstand high potential operation without severe degradation. This parameter change allows the material to operate at high potentials while maintaining structural integrity over repeated charge-discharge cycles.

The patent employs a protective shell coating in the core-shell composite structure that acts as a barrier between the active material and the harsh electrochemical environment. This shell allows high potential operation to increase capacity while preventing structural degradation by isolating the spinel structure from direct contact with the electrolyte.