Journal
JOULE
Volume 2, Issue 9, Pages 1838-1856Publisher
CELL PRESS
DOI: 10.1016/j.joule.2018.06.008
Keywords
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Funding
- National Science Foundation (NSF) [NSF-CBET 1505943, 1706681, NSF-DMR 1554851]
- Ohio Federal Network Research (OFRN) through the Center of Excellence [WSARC-1077-100]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1706681] Funding Source: National Science Foundation
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A phase diagram-guided rational design was introduced to fabricate polymer composite electrolyte, avoiding Edisonian investigations in searching for a polymer electrolyte with high ionic conductivity. The free-standing, flexible, dual-salt-based polymer electrolyte films with superionic conductivity (1.0 mS/cm) at 30 degrees C have been demonstrated. The synergistic effect of salts gave the dual-salt polymer electrolyte outstanding electrochemical stability with a wide electrochemical window of 0-4-5 V (versus Li/Li+). The lithium stripping/plating experiments indicated that the polymer electrolyte could be safely cycled under current density from 0.05 to 0.5 mA/cm(2). The dual-salt polymer electrolyte-based cells exhibited excellent average coulombic efficiency of similar to 99.99% in the first 370 cycles. The initial capacity at 30 degrees C is 138 mAh/g (0.2 C), which is close to the value achieved by liquid-electrolyte-based cells under similar condition. The capacity retention is 86% after 370 cycles, indicating the long-term stability of the polymer electrolyte.
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