In-situ fabrication of a novel CNTs-promoted Na3MnTi(PO4)3@C electrode in high-property sodium-ion storage

Abstract

NASICON-type Na3MnTi(PO4)3 (NMTPO) material is suggested as a novel electrode in sodium energy storage because of its high plateaus, high theoretical capacity, low toxicity and cheap price. Nevertheless, the pristine NMTPO electrode shows the bad high-rate property and poor cycling-life owing to the disappointing electrical conductivity. In this research, we adopt a facile strategy to fabricate the CNTs-promoted NMTPO with in-situ carbon coating (CNTs-NMTPO@C) as promising electrode in sodium-ion storage. Benefiting from the synergistic effects of nanosized NMTPO, thin carbon coating and CNTs, the as-fabricated CNTs-NMTPO@C electrode displays good rate property and superior cycling stability. It can deliver the reversible capacity of 136.8 mAh g−1 at 2.0C and possess a capacity retention of around 92.2 % over 300 cycles at 10.0C. Therefore, we can make a conclusion that the designed CNTs-NMTPO@C material is a promising cathode in sodium-ion storage.