Simultaneous improvement of Li-ion diffusion and surface protection for LiNi0.8Mn0.1Co0.1O2 cathode material via innovative Li2SiO3 layer
ELECTROCHIMICA ACTA, cilt.570, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 570
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.electacta.2026.148980
- Dergi Adı: ELECTROCHIMICA ACTA
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC
- Ondokuz Mayıs Üniversitesi Adresli: Evet
Özet
The surface coating technique effectively enhances the stability and capacity retention of LiNi0.8Mn0.1Co0.1O2 (NCM811). However, the initial Li-ion diffusion of most coating layers is insufficient, leading to diminished electrochemical behavior. The present work introduces an approach for addressing this obstacle by employing a mesoporous layer instead of the conventional bulk layer. A mixture of silicon sources and fine templates is first deposited onto NCM811 particles, then calcined with a lithium source to remove the templates and yield the mesoporous Li2SiO3 layer. The chemical and physical properties of the coating layer and its effects on the electrochemical performance of NCM811 were extensively investigated. Experimental findings demonstrate that the mesoporous Li2SiO3 layer containing 20% fine templates achieves a discharge capacity of 195.2 mAh g-1 and a Li-ion diffusion coefficient of 7.21 & times; 10-9 cm2 s-1, compared to only 180.4 mAh g-1 and 2.60 & times; 10-9 cm2 s-1 for the bulk Li2SiO3-coated sample. This layer demonstrates long-term retention values of 84% at ambient temperature and 71% at 45 degrees C, in contrast to uncoated NCM811, which displays values of 73.7% and 47.8%, respectively. The mesoporous coating improves stability and performance of NCM811 cathode material, rendering it a viable approach for other cathodes.