Cobalt substituted layered O3 and P2-type Na-Ti-Ni-Co-O anode materials for emerging sodium-ion batteries

Sodium ion batteries (SIBs) are considered as a propitious candidate for large scale energy storage devices due to the copious of sodium resources in earth crust and low cost. In this work, layered Cobalt (Co) substituted O3-type NaTi0.6Ni0.3Co0.1O2 (O3-NTNC) and P2-type Na0.5Ti0.6Ni0.3Co0.1O2 (P2-NTNC) anode materials were prepared by solid-state reaction for SIBs. The prepared O-3-NTNC and P2-NTNC can be assigned to rhombohedral and hexagonal structure with the space group of R-3m and P6(3)/mmc respectively, using Rietveld refinement. O3-NTNC and P2-NTNC delivered the reversible capacity of 108 and 96 mAh g(-1) at 0.1C and revealed coulombic efficiency over 90% even after 50 cycles. In addition, partial Co-substitution enhanced the structural stability of the obtained materials during sodiation and desodiation process. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

Automated summary

In this study, layered Cobalt (Co) substituted O3-type NaTi0.6Ni0.3Co0.1O2 (O3-NTNC) and P2-type Na0.5Ti0.6Ni0.3Co0.1O2 (P2-NTNC) anode materials were prepared for sodium ion batteries with good cycling performance and Coulombic efficiency. Partial Co-substitution enhanced the structural stability of the materials during sodiation and desodiation process.