Electrochemically Engineering a Single-Crystal Nickel-Rich Layered Cathode

Nickel-rich layered electrode material has been attracting significant attention owing to its high specific capacity as a cathode for lithium-ion batteries. Generally, the high-nickel ternary precursors obtained by traditional coprecipitation methods are micron-scale. In this work, the submicrometer single-crystal LiNi0.8Co0.1Mn0.1O2 (NCM) cathode is efficiently prepared by electrochemically anodic oxidation followed by a molten-saltassisted reaction without the need of extreme alkaline environments and complex processes. More importantly, when prepared under optimal voltage (10 V), single-crystal NCM exhibits a moderate particle size (similar to 250 nm) and strong metal-oxygen bonds due to reasonable and balanced crystal nucleation/growth rate, which are conducive to greatly enhancing the Li+ diffusion kinetics and structure stability. Given that a good discharge capacity of 205.7 mAh g(-1) at 0.1 C (1 C = 200 mAh g(-1)) and a superior capacity retention of 87.7% after 180 cycles at 1 C are obtained based on the NCM electrode, this strategy is effective and flexible for developing a submicrometer single-crystal nickel-rich layered cathode. Besides, it can be adopted to elevate the performance and utilization of nickel-rich cathode materials.

Automated summary

This study presents a method to efficiently prepare submicrometer single-crystal LiNi0.8Co0.1Mn0.1O2 (NCM) cathode material without the need for extreme alkaline environments and complex processes. The prepared NCM exhibits moderate particle size and strong metal-oxygen bonds, which greatly enhance Li+ diffusion kinetics and structure stability. The NCM electrode shows good discharge capacity and superior capacity retention, indicating the effectiveness and flexibility of this strategy for developing submicrometer single-crystal nickel-rich layered cathode materials.