Lithium-Ion: Cathode

Layered/Olivine NMA/LMFP Blended Cathodes For Cost And Performance Blending layered oxide with olivine is an effective alternative for delivering energy density and cycling stability comparable to lower-Ni cathodes with moderate charging voltages. Blending with 30 wt% olivine LiMn0.5Fe0.5PO4 LMFP) virtually eliminates the diffusion limitation of layered oxides at low state-of-charge, with enhanced pulse power characteristics rivaling high-Ni systems.

Kinetics The impedance decreases once the discharge voltage becomes low enough for the LFP or LMFP to be electrochemically active. Due to its higher average voltage and flatter voltage profile, LMFP will become electrochemically active at a higher discharge voltage 3.6 V) than for LFP 3.4 V Performance & Cost Blending olivine cathodes with high-Ni cathodes allows the cathode Ni content and materials cost to be reduced below 80% while maintaining energy density and cycling stability. Comparable volumetric energy densities suggest that the optimal blend of Ni80/LMFP contains at most 30% LMFP.

Source: Adv. Energy Mater. 2024, 2403002

Extracted from the PDF; charts and images may read imperfectly.