Li- and Mn-rich xLi₂MnO₃∙(1−x)LiMO₂ (M = Mn, Ni, Co) layered oxides cathode materials are known to exhibit high specific capacities ≥ 250 mAhg⁻¹ on the high-voltage operation above 4.6 V vs. Li/Li⁺,^1,2 which are considered as promising cathode materials for achieving advanced high-energy density lithium-ion batteries. The capacity of these cathode materials can increase by increasing the charge cut-off voltage. However, the limited anodic instability of the conventional carbonate-based organic electrolytes above 4.2 V vs. Li/Li⁺ makes the attainment of high capacity from Li-rich layered oxide cathode material difficult. In order to mitigate the electrolyte issue, we have been developing new functional electrolyte components with high anodic stability above 4.6 V to stabilize high-voltage interface between Li-rich layered oxide cathode and electrolyte.^1,2 High-voltage electrochemical and cathode-electrolyte interfacial studies and their correlation to high-voltage cycling performance would be presented in the meeting.

Acknowledgements

This research was supported by Ministry of Trade, Industry & Energy (R0004645) and Creative Human Resource Development Consortium for Fusion Technology of Functional Chemical/ Bio Materials of BK Plus program by Ministry of Education of Korea.

References

1. H. Q. Pham, K.-M. Nam, E.-H. Hwang, Y.-G. Kwon, H.-M. Jung, S.-W. Song, J. Electrochem. Soc., 161, A2002 (2014).

2. H. Q. Pham, E.-H. Hwang, Y.-G. Kwon, S.-W. Song, J. Power Sources, 323, 220, (2016).