Robust Concentration Gradient Co-Free Ni-Rich Cathodes Enable Long-Life and Safe Operations in High-Voltage Li-Ion Batteries
Energy and Fuels, cilt.39, sa.9, ss.4507-4514, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 39 Sayı: 9
- Basım Tarihi: 2025
- Doi Numarası: 10.1021/acs.energyfuels.4c06016
- Dergi Adı: Energy and Fuels
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex
- Sayfa Sayıları: ss.4507-4514
- Boğaziçi Üniversitesi Adresli: Hayır
Özet
Co-free Ni-rich cathodes are the most cost-competitive for high-energy-density Li-ion batteries (LIBs), but their commercial applications are hindered by structural instability and severe interface side reactions compared to those of Co-contained cathodes. Herein, we successfully construct a concentration-gradient LiNi0.753Mn0.247O2 cathode that consists of the elongated and radially aligned primary particles through Mo-Ti-Mg doping. The microcracks and Li/Ni disorder are greatly inhibited with high structural stability. The Co-free Ni-rich cathodes also exhibit a low Li-ion diffusion energy barrier with enhanced reaction kinetics. Besides, the lattice oxygen loss is also reduced due to the stronger Mo-O and Ti-O bonds, further alleviating the undesirable surface parasitic reactions with the electrolyte. As a consequence, a high reversible specific capacity of 212.2 mA h g-1 is achieved at 0.1 C and maintains 94.1 mA h g-1 even at 10 C. Impressively, it displays exceptional high-voltage cycling stability with a capacity retention of 81.1% after 1000 cycles in a pouch full cell at 1 C within 2.7-4.5 V, significantly accelerating the development of Co-free Ni-rich cathodes.