Safety Enhancement In Ni‐Rich Nmc Lithium‐Ion Batteries Through Lithium Manganese Iron Phosphate Additive Integration

This study demonstrates that integrating 10% lithium manganese iron phosphate into high-Ni ternary cathode enhances battery safety by reducing exothermic heat release and improving thermal stability. Safety assessments confirm significant enhancements in acupuncture, differential scanning calorimetry, and overcharge tests, without compromising electrochemical performance, enabling safer high-energy-density lithium-ion batteries.

Increasing the nickel content in high-nickel ternary cathode materials enhances their specific capacity, thereby increasing the energy density of the battery. However, the elevation of nickel content often compromises both thermal stability and structural integrity, thereby, detracting from the safety performance of the battery and hindering the practical application of ultrahigh nickel content cathode materials. This study demonstrates that the addition of 10% LiMn_0.7Fe_0.3PO₄ (LMFP) does not significantly impair the electrochemical performance of LiNi_0.91Co_0.05Mn_0.03Al_0.01O₂ (NCMA) based batteries. Differential scanning calorimetry results demonstrate that the incorporation of 10% LMFP reduces the exothermic heat release from NCMA electrodes while enhancing the temperature of the exothermic peak. Furthermore, a variety of safety assessments conducted on pouch cell devices, including acupuncture, high-temperature chamber, and overcharge tests, confirm that the addition of 10% LMFP substantially enhances the safety of NCMA batteries. These findings highlight the potential of LMFP as a critical additive in overcoming the safety limitations associated with high-nickel cathode materials, thereby paving the way for the further development of safer high-energy-density battery systems.

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