Na⁺/vacancy disordering promises high-rate Na-ion batteries.

ABSTRACT: As one of the most fascinating cathode candidates for Na-ion batteries (NIBs), P2-type Na layered oxides usually exhibit various single-phase domains accompanied by different Na⁺/vacancy-ordered superstructures, depending on the Na concentration when explored in a limited electrochemical window. Therefore, their Na⁺ kinetics and cycling stability at high rates are subjected to these superstructures, incurring obvious voltage plateaus in the electrochemical profiles and insufficient battery performance as cathode materials for NIBs. We show that this problem can be effectively diminished by reasonable structure modulation to construct a completely disordered arrangement of Na-vacancy within Na layers. The combined analysis of scanning transmission electron microscopy,

SUBMITTER: Wang PF 

PROVIDER: S-EPMC5844706 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature