Effect of amounts of nitrogen-doped carbon coating on cyclic stability of NCM811 for lithium-ion batteries

Abstract

Rich-nickel layered ternary NCM811 has been widely used in the field of electric vehicles ascribed to its high theoretical specific capacity. However, poor cycling stability and rate-performance hindered its further development. Herein, different amounts of nitrogen-doped carbon were wrapped on the surface of NCM811 via a facile rheological phase method by regulating the amount of dopamine hydrochloride. The effects of the coating amounts on the structure and electrochemical performance are investigated. The DFT calculation, XRD, SEM and XPS reveal that an appropriate amount of nitrogen-doped carbon coating could uniformly form a protective layer on the NCM811 surface and the introduced N could anchor Ni atoms to inhibit the Li⁺/Ni²⁺ mixing, but excessive amount would reduce Ni³⁺ to Ni²⁺ so as to conversely aggravate Li⁺/Ni²⁺ mixing. Among the samples, the NCM811-CN0.75 sample exhibits the most excellent electrochemical performance, delivering a high-rate capacity of 151.6 mA·h/g at 10C, and long-term cyclability with 82.2% capacity retention after 300 cycles at 5C, exhibiting remarkable rate-performance and cyclability.

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