We systematically explored the formation range of α-NaFeO2-type layered titanate and its ion-exchange behaviors and electrochemical performance. The layered sodium titanate of NaxTi1-x/3Lix/3O2 at x = 0.68-0.70 was synthesized by the solid-state reaction at 900 °C. The titanate is composed of coplanar host layers with the α-NaFeO2-type structure. The interlayer Na+ ions underwent a facile exchange with other alkali metal ions in aqueous solutions at 80 °C, accompanied by concurrent exchange with proton/oxonium ions. Powder X-ray diffraction data on the products and their Rietveld refinement revealed the formation of a unique staging-structured titanate, in which the interlayer galleries are alternately occupied by incoming alkali metal ions and oxonium ions. The electrochemical intercalation-deintercalation properties for Li+ and Na+ ion storage were examined on the pristine sodium titanate and its ion-exchanged derivatives. The staging structure was found to provide superior electrochemical performance, which may be due to the rather open nature of the interlayer galleries, providing abundant sites for Li+ and Na+ ions.
Teepakakorn et al. (Mon,) studied this question.
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