Stabilizing Superionic-Conducting Structures via Mixed-Anion Solid Solutions of Monocarba- closo -borate Salts
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States, Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, United States
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620990, Russia
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
- Energy Nanomaterials, Sandia National Laboratories, Livermore, California 94551, United States
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan, WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
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. Finally, 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.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office; National Science Foundation (NSF)
- Grant/Contract Number:
- AC36-08GO28308; AC04-94AL85000; DMR-0944772; 25220911; 15-03- 01114; 26820311
- OSTI ID:
- 1315853
- Alternate ID(s):
- OSTI ID: 1345722
- Report Number(s):
- NREL/JA-5900-68062
- Journal Information:
- ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 1 Journal Issue: 4; ISSN 2380-8195
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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