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We systematically explored the formation range of α-NaFeO2 type layered titanate, 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 facile exchange with other alkali metal ions in the aqueous solutions at 80 °C, accompanied by concurrent exchange with proton/oxonium ions. Powder X-ray diffraction data on the products and its 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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Layered titanate, Staging structure, Electrochemical performance

Date published: 2025-08-18

Publisher: American Chemical Society (ACS)

Journal:

• Inorganic Chemistry (ISSN: 00201669) vol. 64 issue. 32 p. 16289-16296

Funding:

• National Science and Technology Development Agency FDA-CO-2560-5655
• Ministry of Education, Culture, Sports, Science and Technology
• Core Research for Evolutional Science and Technology JPMJCR22B1

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.inorgchem.5c01712

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Updated at: 2025-08-20 08:30:35 +0900

Published on MDR: 2025-08-20 08:24:22 +0900