New family of layered N-based cathode materials for sodium-ion batteries

Abstract

Layered 2H-phase CrN2 possesses many advantages including high capacity (335 mA h g−1), low diffusion barrier (0.49 eV), high voltage platform (3.8 V) and high energy density (1139 W h kg−1), which is a promising candidate for SIBs cathode materials.

Ultralow diffusion barrier induced by intercalation in layered N-based cathode materials for sodium-ion batteries

“…Moreover, Cs 1/16 CrN 2 has larger negative intercalation energy than CrN 2 without Cs intercalating, indicating that Na can intercalate in Cs 1/16 CrN 2 more easily. 24…”

“…Furthermore, the initial voltage (3.9 V) and average voltage (3.5 V) of CrN 2 with Cs intercalating are both higher than that of CrN 2 without Cs intercalating (initial voltage of 3.8 V and average voltage of 3.4 V). 24…”

“…Moreover, the 2H-phase CrN 2 has the advantages of high theoretical capacity and high electrode potential, which makes it have considerable potential to be applied in the cathode materials of sodium-ion batteries. 24…”

“…Moreover, Cs 1/16 CrN 2 has larger negative intercalation energy than CrN 2 without Cs intercalating, indicating that Na can intercalate in Cs 1/16 CrN 2 more easily. 24 Electrode potential is another important parameter of electrode materials. We calculated the voltage of Cs 1/16 CrN 2 at different Na concentrations.…”

“…[21][22][23] In particular, layered CrN 2 has been proven to be a promising candidate for sodium-ion batteries for its high theoretical capacity and high voltage platform. 24 However, due to the strong interlayer coupling, the diffusion barrier of layered CrN 2 is still too high for practical application. Therefore, it is urgent to explore an efficient way to improve the diffusion performance of SIBs.…”