Synthesis of hybrid layered electrode materials via chemical pre-intercalation of linear organic molecules

Mallory Clites; Ekaterina Pomerantseva

doi:10.1117/12.2321263

11 September 2018 Synthesis of hybrid layered electrode materials via chemical pre-intercalation of linear organic molecules

Mallory Clites, Ekaterina Pomerantseva

Author Affiliations +

Proceedings Volume 10725, Low-Dimensional Materials and Devices 2018; 107250S (2018) https://doi.org/10.1117/12.2321263
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

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-Mg_xV₂O₅ (M=Li, Na, K, Mg, and Ca) structure can be controlled between 9.6 Å (δ-K_xV₂O₅) and 13.4 Å (δ-Mg_xV₂O₅).1 Moreover, the expanded spacing achieved for the δ-Mg_xV₂O₅ 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.

Conference Presentation

Citation Download Citation

Mallory Clites and Ekaterina Pomerantseva "Synthesis of hybrid layered electrode materials via chemical pre-intercalation of linear organic molecules", Proc. SPIE 10725, Low-Dimensional Materials and Devices 2018, 107250S (11 September 2018); https://doi.org/10.1117/12.2321263

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