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Proceedings Paper

Synthesis of hybrid layered electrode materials via chemical pre-intercalation of linear organic molecules
Author(s): Mallory Clites; Ekaterina Pomerantseva
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Paper Abstract

Chemical pre-intercalation is a low-temperature, scalable synthesis method that utilizes a sol-gel process to form layered oxides with positively-charged species inserted between the layers. We have shown that this approach can be used to successfully intercalate Li+ , Na+ , K+ , Mg2+, and Ca2+ ions into the crystal structure of bilayered vanadium oxide (δV2O5).1 Through this ion-intercalation, the interlayer spacing of the δ-MgxV2O5 (M=Li, Na, K, Mg, and Ca) structure can be controlled between 9.6 Å (δ-KxV2O5) and 13.4 Å (δ-MgxV2O5).1 Moreover, the expanded spacing achieved for the δ-MgxV2O5 phase corresponded to increased electrochemical stability in both Li- and Na-ion cells.[1] While this study identified a correlation between expanded interlayer spacing and improved electrochemical stability over cycling, chemical pre-intercalation of ions does not allow for expansion beyond that exhibited by the δ-MgxV2O5 structure. In this work, we show that further expansion of the interlayer spacing can be achieved via pre-intercalation of positivelycharged linear, organic cations. We report synthesis of hybrid inorganic/organic materials with a 1D nanobelt morphology. The layered structure of the hybrids is confirmed by both XRD and TEM analysis. δ-V2O5 preintercalated with cetyltrimethylammonia ions, CTA+ , demonstrated the interlayer spacings of all samples (31 Å), more than twice larger than the largest interlayer spacing achieved via pre-intercalation of inorganic ions. The effects of carbon chainlength and positively charged nitrogen termini on the interlayer spacing and electrochemical stability is investigated, with two N-termini on the cation (DMO+) resulting in increased electrochemical stability of the preintercalated phase.

Paper Details

Date Published: 11 September 2018
PDF: 9 pages
Proc. SPIE 10725, Low-Dimensional Materials and Devices 2018, 107250S (11 September 2018); doi: 10.1117/12.2321263
Show Author Affiliations
Mallory Clites, Drexel Univ. (United States)
Ekaterina Pomerantseva, Drexel Univ. (United States)

Published in SPIE Proceedings Vol. 10725:
Low-Dimensional Materials and Devices 2018
Nobuhiko P. Kobayashi; A. Alec Talin; M. Saif Islam; Albert V. Davydov, Editor(s)

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