TY - JOUR
T1 - Unparalleled lithium and sodium superionic conduction in solid electrolytes with large monovalent cage-like anions
AU - Tang, Wan Si
AU - Unemoto, Atsushi
AU - Zhou, Wei
AU - Stavila, Vitalie
AU - Matsuo, Motoaki
AU - Wu, Hui
AU - Orimo, Shin Ichi
AU - Udovic, Terrence J.
N1 - Publisher Copyright:
© 2015 The Royal Society of Chemistry.
PY - 2015/12
Y1 - 2015/12
N2 - Solid electrolytes with sufficiently high conductivities and stabilities are the elusive answer to the inherent shortcomings of organic liquid electrolytes prevalent in today's rechargeable batteries. We recently revealed a novel fast-ion-conducting sodium salt, Na2B12H12, which contains large, icosahedral, divalent B12H122- anions that enable impressive superionic conductivity, albeit only above its 529 K phase transition. Its lithium congener, Li2B12H12, possesses an even more technologically prohibitive transition temperature above 600 K. Here we show that the chemically related LiCB11H12 and NaCB11H12 salts, which contain icosahedral, monovalent CB11H12- anions, both exhibit much lower transition temperatures near 400 K and 380 K, respectively, and truly stellar ionic conductivities (>0.1 S cm-1) unmatched by any other known polycrystalline materials at these temperatures. With proper modifications, we are confident that room-temperature-stabilized superionic salts incorporating such large polyhedral anion building blocks are attainable, thus enhancing their future prospects as practical electrolyte materials in next-generation, all-solid-state batteries.
AB - Solid electrolytes with sufficiently high conductivities and stabilities are the elusive answer to the inherent shortcomings of organic liquid electrolytes prevalent in today's rechargeable batteries. We recently revealed a novel fast-ion-conducting sodium salt, Na2B12H12, which contains large, icosahedral, divalent B12H122- anions that enable impressive superionic conductivity, albeit only above its 529 K phase transition. Its lithium congener, Li2B12H12, possesses an even more technologically prohibitive transition temperature above 600 K. Here we show that the chemically related LiCB11H12 and NaCB11H12 salts, which contain icosahedral, monovalent CB11H12- anions, both exhibit much lower transition temperatures near 400 K and 380 K, respectively, and truly stellar ionic conductivities (>0.1 S cm-1) unmatched by any other known polycrystalline materials at these temperatures. With proper modifications, we are confident that room-temperature-stabilized superionic salts incorporating such large polyhedral anion building blocks are attainable, thus enhancing their future prospects as practical electrolyte materials in next-generation, all-solid-state batteries.
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U2 - 10.1039/c5ee02941d
DO - 10.1039/c5ee02941d
M3 - Article
AN - SCOPUS:84948395711
VL - 8
SP - 3637
EP - 3645
JO - Energy and Environmental Science
JF - Energy and Environmental Science
SN - 1754-5692
IS - 12
ER -