高強度で微細構造の応力散逸と結晶相イオン輸送改善の二重機能戦略から達成される頑健なLiNi0.6Mn0.4O2カソード

LiNi_0.6Mn_0.4O₂ (NM64), a cobalt-free cathode material with high theoretical capacity and approximately 30% lower cost than commercial LiNi_0.6Co_0.2Mn_0.2O₂ (NCM622), is a promising cathode for lithium-ion batteries. However, structural instability and sluggish kinetics limit its potential for large-scale commercial applications. To address these challenges, we propose a dual-function strategy that simultaneously enhances ion transport by reducing cation mixing and dissipates stress via elongated primary grains in oxygen-calcined NM64 (O-NM64), achieving superior robustness. Consequently, the O-NM64 exhibits a high specific capacity of 201.6 mAh g^-1 at 0.2 C, coupled with a high-rate capability of 153.40 mAh g^-1 at 10 C and long-term cycling stability, as evidenced by an 81.38% capacity retention after 450 cycles at 0.2 C (more than 220 days of continuous operation). Moreover, a 20 kg-scale pouch cell shows no significant capacity degradation over 300 cycles. This work demonstrates an effective approach for developing high-energy, high-power, long-cycle, resource-saving, and low-cost cathodes, offering insights into sustainable battery technologies that balance performance and cost.