Progress in Preparation and Modification of LiNi0.6Mn0.2Co0.2O2 Cathode Material for High Energy Density Li-Ion Batteries

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Abstract

Due to the advantages of high specific capacity, various temperatures, and low cost, layered LiNi _0.6Co _0.2Mn _0.2O ₂ has become one of the potential cathode materials for lithium-ion battery. However, its application was limited by the high cation mixing degree and poor electric conductivity. In this paper, the influences of synthesis methods and modification such surface coating and doping materials on the electrochemical properties such as capacity, cycle stability, rate capability, and impedance of LiNi _0.6Co _0.2Mn _0.2O ₂ cathode materials are reviewed and discussed. The confronting issues of LiNi _0.6Co _0.2Mn _0.2O ₂ cathode materials have been pointed out, and the future development of its application is also prospected.

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Comparison of the structural and electrochemical properties of layered Li[NixCoyMnz]O2 (x = 1/3, 0.5, 0.6, 0.7, 0.8 and 0.85) cathode material for lithium-ion batteries

Hyung-Joo Noh, Sungjune Youn, Chong Seung Yoon … (2013)

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Inter-granular cracking as a major cause of long-term capacity fading of layered cathodes.

Hao Liu, Mark Wolf, Khim Karki … (2017)

Capacity fading has limited commercial layered Li-ion battery electrodes to <70% of their theoretical capacity. Higher capacities can be achieved initially by charging to higher voltages, however, these gains are eroded by a faster fade in capacity. Increasing lifetimes and reversible capacity are contingent on identifying the origin of this capacity fade to inform electrode design and synthesis. We used operando X-ray diffraction, to observe how the lithiation-delithiation reactions within a LiNi0.8Co0.15Al0.05O2 (NCA) electrode change after capacity fade following months of slow charge-discharge. The changes in the reactions that underpin energy storage after long-term cycling directly correlate to the capacity loss; heterogeneous reaction kinetics observed during extended cycles quantitatively account for the capacity loss. This reaction heterogeneity is ultimately attributed to inter-granular fracturing that degrades the connectivity of sub-surface grains within the polycrystalline NCA aggregate.