Constructing Robust Interfaces in CoSe2/Nitrogen-Doped Carbon for Superior Long-Life Sodium-Ion Storage

Le résumé fourni par la source

Robust interfaces in anodes play a crucial role in boosting sodium-ion battery (SIB) performance. However, the fragile interfaces constructed by a two-step synthesis or artificial stack are prone to be destroyed during the charging/discharging processes, which significantly reduces the lifetime of SIBs. Here, a facile construction strategy is developed to produce robust interfaces in hollow sphere-like CoSe 2 /nitrogen-doped carbon (HS-CoSe 2 /NC) using intrinsic Co, N, C in metal–organic framework as precursors, which enhance the electron/ion diffusion kinetics. In parallel, the hollow sphere structure of CoSe 2 /NC contributes to shortening the sodium-ion diffusion distance and guaranteeing structure stability. Benefiting from the unique design, ultrahigh reversible specific capacity (456.6 mAh g –1 at 5 A g –1 ) is maintained even after 7250 cycles with a supreme capacity retention (96.6%). The sodium-ion storage mechanism is clarified by combining theoretical calculations and in situ/ex situ experimental characterizations. This work provides a new pathway to build robust interfaces in anodes for boosting SIBs performance.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.