Stabilizing Superionic-Conducting Structures via Mixed-Anion Solid Solutions of Monocarba-closo-borate Salts

Wan Si Tang, Koji Yoshida, Alexei V. Soloninin, Roman V. Skoryunov, Olga A. Babanova, Alexander V. Skripov, Mirjana Dimitrievska, Vitalie Stavila, Shin Ichi Orimo, Terrence J. Udovic

Research output: Contribution to journalArticlepeer-review

128 Citations (Scopus)


Solid lithium and sodium closo-polyborate-based salts are capable of superionic conductivities surpassing even liquid electrolytes, but often only at above-ambient temperatures where their entropically driven disordered phases become stabilized. Here we show by X-ray diffraction, quasielastic neutron scattering, differential scanning calorimetry, NMR, and AC impedance measurements that by introducing "geometric frustration" via the mixing of two different closo-polyborate anions, namely, 1-CB9H10 - and CB11H12 -, to form solid-solution anion-alloy salts of lithium or sodium, we can successfully suppress the formation of possible ordered phases in favor of disordered, fast-ion-conducting alloy phases over a broad temperature range from subambient to high temperatures. This result exemplifies an important advancement for further improving on the remarkable conductive properties generally displayed by this class of materials and represents a practical strategy for creating tailored, ambient-temperature, solid, superionic conductors for a variety of upcoming all-solid-state energy devices of the future.

Original languageEnglish
Pages (from-to)659-664
Number of pages6
JournalACS Energy Letters
Issue number4
Publication statusPublished - 2016 Oct 14


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