Electrochemical Window of the Li-Ion Solid Electrolyte Li7La3Zr2O12
Electrochemical Window of the Li-Ion Solid Electrolyte Li7La3Zr2O12
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DOI：
10.1021/acsenergylett.6b00593
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发表时间：
2017-01
影响因子：
22
通讯作者：
T. Thompson;Seungho Yu;L. Williams;R. Schmidt;Regina Garcia‐Mendez;J. Wolfenstine;J. Allen;E. Kio
中科院分区：
文献类型：
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作者：
T. Thompson;Seungho Yu;L. Williams;R. Schmidt;Regina Garcia‐Mendez;J. Wolfenstine;J. Allen;E. Kio
The recent discovery of fast ion-conducting solid electrolytes could enable solid-state and other advanced battery chemistries with higher energy densities and enhanced safety. In addition to high ionic conductivity, a viable electrolyte should also exhibit an electrochemical window that is wide enough to suppress undesirable electronic transport (i.e., self-discharge and/or short circuiting) arising from charge injection or extraction from the electrodes. Here, direct current chronoamperometry, alternating current electrochemical impedance spectroscopy, and optical absorption band gap measurements are combined with first-principles calculations to systematically characterize the electrochemical window of the promising superionic conductor Li7La3Zr2O12 (LLZO). Negligible electronic current was measured within LLZO for a wide range of voltages relevant for high-voltage cathodes. This auspicious behavior is consistent with both the large band gap (∼6 eV) predicted for LLZO and the absolute positions of its ...
