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Title: Electrochemical Stability of Li10GeP2S12 and Li7La3Zr2O12 Solid Electrolytes

Journal Article · · Advanced Energy Materials
 [1];  [2];  [2];  [2];  [1]
  1. Univ. of Maryland, College Park, MD (United States). Dept. of Chemical and Biomolecular Engineering
  2. Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering

The electrochemical stability window of solid electrolyte is overestimated by the conventional experimental method using a Li/electrolyte/inert metal semiblocking electrode because of the limited contact area between solid electrolyte and inert metal. Since the battery is cycled in the overestimated stability window, the decomposition of the solid electrolyte at the interfaces occurs but has been ignored as a cause for high interfacial resistances in previous studies, limiting the performance improvement of the bulk-type solid-state battery despite the decades of research efforts. Thus, there is an urgent need to identify the intrinsic stability window of the solid electrolyte. The thermodynamic electrochemical stability window of solid electrolytes is calculated using first principles computation methods, and an experimental method is developed to measure the intrinsic electrochemical stability window of solid electrolytes using a Li/electrolyte/electrolyte-carbon cell. The most promising solid electrolytes, Li10GeP2S12 and cubic Li-garnet Li7La3Zr2O12, are chosen as the model materials for sulfide and oxide solid electrolytes, respectively. The results provide valuable insights to address the most challenging problems of the interfacial stability and resistance in high-performance solid-state batteries.

Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); National Science Foundation (NSF); US Army Research Office (ARO)
Grant/Contract Number:
EE0006860; 1235719; TG-DMR130142; W911NF1510187
OSTI ID:
1433676
Alternate ID(s):
OSTI ID: 1433674
Journal Information:
Advanced Energy Materials, Vol. 6, Issue 8; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 642 works
Citation information provided by
Web of Science

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