Progress of Single-Crystal Nickel-Cobalt-Manganese Cathode Research

Abstract

The booming electric vehicle industry continues to place higher requirements on power batteries related to economic-cost, power density and safety. The positive electrode materials play an important role in the energy storage performance of the battery. The nickel-rich NCM (LiNixCoyMnzO2 with x + y + z = 1) materials have received increasing attention due to their high energy density, which can satisfy the demand of commercial-grade power batteries. Prominently, single-crystal nickel-rich electrodes with s unique micron-scale single-crystal structure possess excellent electrochemical and mechanical performance, even when tested at high rates, high cut-off voltages and high temperatures. In this review, we outline in brief the characteristics, problems faced and countermeasures of nickel-rich NCM materials. Then the distinguishing features and main synthesis methods of single-crystal nickel-rich NCM materials are summarized. Some existing issues and modification methods are also discussed in detail, especially the optimization strategies under harsh conditions. Finally, an outlook on the future development of single-crystal nickel-rich materials is provided. This work is expected to provide some reference for research on single-crystal nickel-rich ternary materials with high energy density, high safety levels, long-life, and their contribution to sustainable development.

Benchmarking the electrochemical parameters of the LiNi0.8Mn0.1Co0.1O2 positive electrode material for Li-ion batteries

“…Much less is known on other essential aspects of the NMC811 electrochemical behavior, such as first cycle Coulombic efficiency, rate capability and capacity retention. Due to natural space and time limitations, only a little fraction of the reported data is usually analyzed and summarized in review articles that might be sufficient for picking up qualitative trends, but does not allow for reliable quantitative estimates [ [5] , [6] , [7] , [8] , [9] , [10] , [11] ]. Particularly, quantitative correlations between various parameters (such as discharge capacity vs voltage range or capacity retention vs C-rate) are lacking.…”