Ceramic–Salt Composite Electrolytes from Cold Sintering

Wonho Lee, Christopher K. Lyon, Joo Hwan Seo, Raymond Lopez-Hallman, Yongjun Leng, Chao Yang Wang, Michael A. Hickner, Clive A. Randall, Enrique D. Gomez

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


The development of solid electrolytes with the combination of high ionic conductivity, electrochemical stability, and resistance to Li dendrites continues to be a challenge. A promising approach is to create inorganic–organic composites, where multiple components provide the needed properties, but the high sintering temperature of materials such as ceramics precludes close integration or co-sintering. Here, new ceramic–salt composite electrolytes that are cold sintered at 130 °C are demonstrated. As a model system, composites of Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) or Li 1+ x + y Al x Ti 2− x Si y P 3− y O 12 (LATP) with bis(trifluoromethanesulfonyl)imide (LiTFSI) salts are cold sintered. The resulting LAGP–LiTFSI and LATP–LiTFSI composites exhibit high relative densities of about 90% and ionic conductivities in excess of 10 −4 S cm −1 at 20 °C, which are comparable with the values obtained from LAGP and LATP sintered above 800 °C. It is also demonstrated that cold sintered LAGP–LiTFSI is electrochemically stable in Li symmetric cells over 1800 h at 0.2 mAh cm −2 . Cold sintering provides a new approach for bridging the gap in processing temperatures of different materials, thereby enabling high-performance composites for electrochemical systems.

Original languageEnglish (US)
Article number1807872
JournalAdvanced Functional Materials
Issue number20
StatePublished - May 16 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science
  • Electrochemistry
  • Biomaterials


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