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Lithium ion mobility in oligomerized and polymerized lithium dicyanamide

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Abstract

Lithium dicyanamide (LiN(CN)2) can trimerize, oligomerize, or polymerize through thermal treatment, and the product of this polymerization is dependent on both impurities and conditions of heating. We have thermally treated LiC2N3 containing small amounts of various additives such as halide, NaC2N3, LiCN, and other materials as pressed pellets under vacuum, and characterized the products by both solution and solid-state NMR, and by dielectric relaxation spectroscopy. Direct detection of 13C NMR spectra for the solid products was used to determine the relative amounts triazine and C≡N. The relative intensities and widths of the triazine peaks reflected variations in the reaction completion. We have also performed variable temperature 7Li NMR which is particularly useful for determining the correlation times and activation energies of the lithium ion motion in these materials as a function of preparation conditions and thermal history.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

Support for this research comes from the Office of Naval Research (ONR) through the base program NRL core funding.

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Authors and Affiliations

  1. Chemistry Division, US Naval Research Laboratory, Washington, DC, 20375, USA

    Christopher A. Klug, Daniel M. Fragiadakis & Andrew P. Purdy

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  1. Christopher A. Klug
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  2. Daniel M. Fragiadakis
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  3. Andrew P. Purdy
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Correspondence to Christopher A. Klug.

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Klug, C.A., Fragiadakis, D.M. & Purdy, A.P. Lithium ion mobility in oligomerized and polymerized lithium dicyanamide. MRS Advances 7, 433–437 (2022). https://doi.org/10.1557/s43580-022-00249-8

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