期刊
ACS ENERGY LETTERS
卷 1, 期 4, 页码 659-664出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00310
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资金
- Collaborative Research Center on Energy Materials, Tohoku University
- JSPS KAKENHI [25220911, 26820311]
- Russian Federal Agency of Scientific Organizations [01201463330]
- Russian Foundation for Basic Research [15-03-01114]
- U.S. DOE Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office [DE-AC36-08GO28308]
- U.S. DOE's National Nuclear Security Administration [DE-AC04-94AL85000]
- National Science Foundation [DMR-0944772]
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.
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