Optimized electrochemical performance of Ni rich LiNi0.91Co0.06Mn0.03O2 cathodes for high-energy lithium ion batteries

Seung-Hwan Lee; Seul Lee; Bong-Soo Jin; Hyun-Soo Kim

doi:10.1038/s41598-019-45531-2

Optimized electrochemical performance of Ni rich LiNi_0.91Co_0.06Mn_0.03O₂ cathodes for high-energy lithium ion batteries

Sci Rep. 2019 Jun 20;9(1):8901. doi: 10.1038/s41598-019-45531-2.

Authors

Seung-Hwan Lee¹, Seul Lee¹, Bong-Soo Jin¹, Hyun-Soo Kim²

Affiliations

¹ Next-Generation Battery Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, South Korea.
² Next-Generation Battery Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, South Korea. hskim@keri.re.kr.

Abstract

We report high electrochemical performances of LiNi_0.91Co_0.06Mn_0.03O₂ cathode material for high-energy lithium ion batteries. LiNi_0.91Co_0.06Mn_0.03O₂ is synthesized at various sintering temperatures (640~740 °C). The sintering temperatures affect crystallinity and structural stability, which play an important role in electrochemical performances of LiNi_0.91Co_0.06Mn_0.03O₂. The electrochemical performances are improved with increasing sintering temperature up to an optimal sintering temperature. The LiNi_0.91Co_0.06Mn_0.03O₂ sintered at 660 °C shows remarkably excellent performances such as initial discharge capacity of 211.5 mAh/g at 0.1 C, cyclability of 85.3% after 70 cycles at 0.5 C and rate capability of 90.6% at 2 C as compared to 0.5 C. These results validate that LiNi_0.91Co_0.06Mn_0.03O₂ sintered at 660 °C can be regarded as a next generation cathode.