Co-Substitution Enhances the Rate Capability and Stabilizes the Cyclic Performance of O3-Type Cathode NaNi0.45
By Zhou, Chaojin; Yang, Lichun; Zhou, Chaogang; Lu, Bin; Liu, Jiangwen; Ouyang, Liuzhang; Hu, Renzong; Liu, Jun; Zhu, Min
Published in ACS Applied Materials & Interfaces
2019
Abstract
O3-type NaNiO2-based cathode materials suffer irreversible phase transition when they are charged to above 4.0 V in sodium-ion batteries. To solve this problem, we partially substitute Ni2+ in O3-type NaNi0.45Mn0.25Ti0.3O2 by Co3+. NaNi0.45Mn0.25Ti0.3O2 with co-substitution possesses an expanded interlayer and exhibits higher rate capability, as well as cyclic stability, compared with the pristine cathode in 2.0