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Title: Sulfide glass solid-state electrolyte separators for Li metal batteries: using an interlayer to increase rate performance and reduce stack pressure

Journal Article · · Materials Advances
DOI: https://doi.org/10.1039/d1ma00926e · OSTI ID:2326216
ORCiD logo [1];  [2];  [3];  [3];  [3]
  1. General Motors Global R&D, Warren, MI (United States); General Motors Global R&D
  2. Optimal, Inc., Plymouth, MI (United States)
  3. General Motors Global R&D, Warren, MI (United States)
+ Show Author Affiliations

We report on the solubility of (Li2S)60(SiS2)x(P2S5)40–x, (0 ≤ x ≤ 40) sulfide glass solid-state electrolytes in the 1:1 (v/v) DME:DOL solvent mixture, a popular choice for lithium metal battery liquid electrolytes. SiS2-rich glasses within the compositional range of (Li2S)60(SiS2)x(P2S5)40–x (28 ≤ x ≤ 40) were found to be functionally insoluble in DME:DOL. Hybrid symmetric test cells with a thin liquid electrolyte layer (0.6 M LiTFSI + 0.4 M LiNO3 in 1:1 (v/v) DME:DOL) at the interface between lithium metal electrodes and an insoluble (Li2S)60(SiS2)28(P2S5)12 glass wafer were tested. Hybrid test cells delivered a critical current density of 3.0 mA cm–2 at 25 °C and 0.1 MPa, which is nearly double the CCD of comparable dry symmetric test cells cycled at 10× higher stack pressure.

Research Organization:
General Motors Global R&D, Warren, MI (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
Grant/Contract Number:
EE0008857
OSTI ID:
2326216
Journal Information:
Materials Advances, Journal Name: Materials Advances Journal Issue: 8 Vol. 3; ISSN 2633-5409
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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