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Cold sintering process of Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 solid electrolyte

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14727· OSTI ID:1401766
 [1];  [1];  [1];  [2];  [1]
  1. Center for Dielectrics &, Piezoelectrics Materials Research Institute The Pennsylvania State University University Park Pennsylvania, Department of Materials Science &, Engineering The Pennsylvania State University University Park Pennsylvania
  2. Center for Dielectrics &, Piezoelectrics Materials Research Institute The Pennsylvania State University University Park Pennsylvania, Department of Materials Science &, Engineering The Pennsylvania State University University Park Pennsylvania, Department of Engineering Science &, Mechanics Millennium Science Complex The Pennsylvania State University University Park Pennsylvania
Abstract

The recently developed technique of cold sintering process (CSP) enables densification of ceramics at low temperatures, i.e., <300°C. CSP employs a transient aqueous solvent to enable liquid phase‐assisted densification through mediating the dissolution‐precipitation process under a uniaxial applied pressure. Using CSP in this study, 80% dense Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) electrolytes were obtained at 120°C in 20 minutes. After a 5 minute belt furnace treatment at 650°C, 50°C above the crystallization onset, Li‐ion conductivity was 5.4 × 10 −5  S/cm at 25°C. Another route to high ionic conductivities ~10 −4  S/cm at 25°C is through a composite LAGP ‐ (PVDF‐HFP) co‐sintered system that was soaked in a liquid electrolyte. After soaking 95, 90, 80, 70, and 60 vol% LAGP in 1 M LiPF 6 EC‐DMC (50:50 vol%) at 25°C, Li‐ion conductivities were 1.0 × 10 −4  S/cm at 25°C with 5 to 10 wt% liquid electrolyte. This paper focuses on the microstructural development and impedance contributions within solid electrolytes processed by (i) Crystallization of bulk glasses, (ii) CSP of ceramics, and (iii) CSP of ceramic‐polymer composites. CSP may offer a new route to enable multilayer battery technology by avoiding the detrimental effects of high temperature heat treatments.

Sponsoring Organization:
USDOE
OSTI ID:
1401766
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 100; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

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