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Critical Role of the Chemical Environment of Interlayer Na Sites: An Effective Way To Improve the Na Ion Electrode Activity of Layered Titanate

Title
Critical Role of the Chemical Environment of Interlayer Na Sites: An Effective Way To Improve the Na Ion Electrode Activity of Layered Titanate
Authors
Piao, MeinaOh, Seung MiLim, JoohyunHa Kim, SunKim, Sung-ChulJo, Yun KyungHan, Oc HeeHwang, Seong-Ju
Ewha Authors
황성주한옥희
SCOPUS Author ID
황성주scopus; 한옥희scopus
Issue Date
2018
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link
Citation
ACS APPLIED MATERIALS & INTERFACES vol. 10, no. 39, pp. 33112 - 33123
Keywords
sodium-ion batteryinterlayer Na sitesstacking structuren-alkylamine intercalationlayered titanatesolid-state NMR spectroscopy
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The chemical environments of the interlayer Na sites of layered titanate are finely controlled by the intercalation of n-alkylamine with various alkyl chain lengths to explore an effective way to improve its electrode functionality for sodium-ion batteries (SIBs). The n-alkyl-amine intercalation via ion-exchange and exfoliation-restacking routes allows the modification of in-plane structures of layered titanate to be tuned. Among the present n-alkylamine-intercalates, the n-pentylamine-intercalated titanate shows the Cycle number largest discharge capacity with the best rate characteristics, underscoring the critical role of optimized intracrystalline structure in improving the SIB electrode performance of layered titanate. The creation of turbostratic in-plane structure degrades the SIB electrode performance of layered titanate, indicating the detrimental effect of in-plane structural disorder on electrode activity. Na-23 magic-angle spinning nuclear magnetic resonance spectroscopy demonstrates that the n-alkylamine-intercalated titanates possess two different interlayer Na+ sites near ammonium head groups/titanate layers and near alkyl chains. The intercalation of long-chain molecules increases the population of the latter site and the overall mobility of Na+ ions, which is responsible for the improvement of electrode activity upon n-alkylamine intercalation. The present study highlights that the increased population of interlayer metal sites remote from the host layers is effective in improving the electrode functionality of layered metal oxide for SIBs and multivalent ion batteries.
DOI
10.1021/acsami.8b07031
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자연과학대학 > 화학·나노과학전공 > Journal papers
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