Enhanced electrochemical performance of a nano Li2B4O7-Al2O3 coated Li1.20Mn0.54Ni0.13Co0.13O2 cathode material for high-energy Li-ion batteries
Journal of Energy Storage, cilt.171, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 171
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.est.2026.122924
- Dergi Adı: Journal of Energy Storage
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
- Anahtar Kelimeler: Cathode materials, Li-ion Batteries, Li-rich NMC, Li2B4O7-Al2O3coating
- Süleyman Demirel Üniversitesi Adresli: Evet
Özet
Li1.20Mn0.54Ni0.13Co0.13O2 has attracted considerable attention from researchers due to its high-voltage operation and capacity exceeding 250 mAh/g, which is significantly higher than that of conventional cathodes with spinel and olivine structures. However, Li-rich NMC cathode materials suffer from several problems, including voltage fading, irreversible capacity loss, and structural deterioration caused by HF attack, side reactions, and Li2O formation at the interlayer electrode/electrolyte interface during prolonged cycling. This study aims to enhance the structural stability of Li1.20Mn0.54Ni0.13Co0.13O2 material by forming the coated Li2B4O7-Al2O3 layer at the electrode-electrolyte interface. XRD confirms that all the diffraction peaks of the cathode materials are identified as a typical layered hexagonal α-NaFeO2 structure. SEM reveals all samples comprise polyhedral-like particles, with thicknesses of about 150–500 nm. TEM images and elemental mapping reveal a Li2B4O7-Al2O3 coating layer with a nanometer-scale thickness (∼4 nm). Charge-discharge tests illustrate that the NMC-75 sample exhibits a higher discharge capacity (277.92 mAh/g) compared to that (255.04 mAh/g) of the pristine NMC-00 sample. Furthermore, the coated sample demonstrates a capacity retention of 82.60% after 130 cycles at C/3, which is notably superior to the 74.08% retention of the uncoated sample. The EIS test verifies that the coating layer improves charge-transfer resistance and stabilizes the electrode-electrolyte interface during the first and 130th cycles. These results reveal that the structural stability of the Li1.20Mn0.54Ni0.13Co0.13O2 sample can be improved with conductive dual-coating materials, highlighting the need for effective surface-engineering strategies to suppress unwanted side reactions at the cathode-electrolyte the interlayer.