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- Title
Electrochemical properties of LiNi<sub>0.9</sub>Co<sub>0.1</sub>O<sub>2</sub> cathode material prepared by co-precipitation using an eco-friendly chelating agent.
- Authors
Park, Hyun Woo; Hwang, Jin Ung; Im, Ji Sun; Lee, Jong Dae
- Abstract
In this work, a spherical Ni0.9Co0.1(OH)2 precursor with average particle size 4.2 μm was synthesized by co-precipitation using citric acid as eco-friendly chelating agent. A layered LiNi0.9Co0.1O2 cathode material was prepared by heating a mixture of Ni0.9Co0.1(OH)2 precursor and LiOH·H2O at temperatures ranging from 680 to 740 °C in an oxygen environment. The optimum heating process for calcination was studied based on reaction temperature and time (low temperature: small primary particle and gap of surface → low reversal efficiency; high temperature: big primary particle → low rate performance; short reaction time: low crystallinity → low reversal efficiency; long reaction time: big primary particle → low rate performance). The LiNi0.9Co0.1O2 cathode material heated at 700 °C showed the lowest cation mixing effect and excellent crystallinity; the material exhibited excellent initial charge/discharge characteristics but low rate performance. The cathode material heated at 700 °C was selected as the material to be reheated because of its excellent characteristics. To overcome structural stability at the high rate, the cathode material heated at 700 °C was reheated at 700 °C; the re-heated material delivered an initial discharge capacity of 215.3 mAh/g. The capacity stability of the reheated cathode material (84.5% at the 50th cycle) was better than that of the pristine cathode material (76.0% at the 50th cycle) because of increased structural stability. The reheated cathode material also exhibited excellent rate performance (75.3% at 6 C/0.1 C).
- Subjects
CATHODES; COPRECIPITATION (Chemistry); CALCINATION (Heat treatment); CHELATING agents; STRUCTURAL stability; CITRIC acid; LOW temperatures
- Publication
Journal of Solid State Electrochemistry, 2022, Vol 26, Issue 8, p1567
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-022-05170-6