Bio-polymer agar-assisted sol-gel synthesis and electrochemical characterization of bi-pyramidal LiNi0.8Co0.1Mn0.1O2 cathode materials for lithium-ion batteries
Journal
Journal of Sol-Gel Science and Technology
Date Issued
2023-01-01
Author(s)
Abstract
Abstract: The bi-pyramidal shape of LiNi0.8Co0.1Mn0.1O2/C was achieved via a sol-gel technique aided by agar. The agar-assisted procedure resulted in bi-pyramidal-shaped particles with less agglomeration and less cation mixing. The resulting sample had a high specific discharge capacity of 182 mAh/g at 0.1 C. The capacity retention rate for LiNi0.8Co0.1Mn0.1O2/C was observed to be 78% after 50 cycles at 0.3 C. However, the pristine LiNi0.8Co0.1Mn0.1O2 sample made without agar, on the other hand, showed a low specific discharge capacity of 171 mAh/g at 0.1 C. The retention rate of without carbon-coated LiNi0.8Co0.1Mn0.1O2 sample was just 67% after 50 cycles at 0.3 C. The agar-assisted procedure yielded a low charge transfer resistance of 20 Ω due to the presence of a carbon coating on the surface of LiNi0.8Co0.1Mn0.1O2/C particles. The diffusion coefficient of lithium ions measured during the charging and discharging processes for LiNi0.8Co0.1Mn0.1O2/C was 3.80 × 10−10 cm2/s and 1.45 × 10−10 cm2/s, respectively. The increased cell efficiency was ascribed to the sample’s reduced cell polarization as a result of improved cation ordering and the addition of agar to create carbon coating. An agar-assisted sol-gel synthesis is a viable approach for producing LiNi0.8Co0.1Mn0.1O2 cathode material for high-performance lithium-ion batteries in recent studies. Graphical Abstract: [Figure not available: see fulltext.]
Subjects
agar | LiNi Co Mn O 0.8 0.1 0.1 2 | Lithium-ion battery | single crystal | surface-modification
Type
journal article