Limiting cationic mixing and lattice oxygen loss of single-crystalline Ni-rich Co-poor cathodes for high-voltage Li-ion batteries
Green Energy and Environment, cilt.10, sa.8, ss.1789-1796, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 10 Sayı: 8
- Basım Tarihi: 2025
- Doi Numarası: 10.1016/j.gee.2025.03.004
- Dergi Adı: Green Energy and Environment
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.1789-1796
- Anahtar Kelimeler: Ni-rich cathodes, Single-crystalline, Cationic mixing, Li-ion batteries
- Boğaziçi Üniversitesi Adresli: Hayır
Özet
Developing cost-effective single-crystalline Ni-rich Co-poor cathodes operating at high-voltage is one of the most important ways to achieve higher energy Li-ion batteries. However, the Li/O loss and Li/Ni mixing under high-temperature lithiation result in electrochemical kinetic hysteresis and structural instability. Herein, we report a highly-ordered single-crystalline LiNi0.85Co0.05Mn0.10O2 (NCM85) cathode by doping K+ and F− ions. To be specific, the K-ion as a fluxing agent can remarkably decrease the solid-state lithiation temperature by ∼30 °C, leading to less Li/Ni mixing and oxygen vacancy. Meanwhile, the strong transitional metal (TM)-F bonds are helpful for enhancing de-/lithiation kinetics and limiting the lattice oxygen escape even at 4.5 V high-voltage. Their advantages synergistically endow the single-crystalline NCM85 cathode with a very high reversible capacity of 222.3 mAh g−1. A superior capacity retention of 91.3% is obtained after 500 times at 1 C in pouch-type full cells, and a prediction value of 75.3% is given after cycling for 5000 h. These findings are reckoned to expedite the exploitation and application of high-voltage single-crystalline Ni-rich cathodes for next-generation Li-ion batteries.