Importance of multimodal characterization and influence of residual Li2S impurity in amorphous Li3PS4 inorganic electrolytes

Mirmira, Priyadarshini; Zheng, Jin; Ma, Peiyuan; Amanchukwu, Chibueze V.

doi:10.1039/d1ta02754a

Importance of multimodal characterization and influence of residual Li₂S impurity in amorphous Li₃PS₄ inorganic electrolytes

Journal Article · Thu May 06 00:00:00 EDT 2021 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/d1ta02754a· OSTI ID:1840904

^[1]; Zheng, Jin ^[1]; Ma, Peiyuan ^[1]; ^[2]

Univ. of Chicago, IL (United States)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)

Amorphous Li₃PS₄ (LPS) solid-state electrolytes are promising for energy-dense lithium metal batteries. LPS glass, synthesized from a 3:1 mol ratio of Li₂S and P₂S₅, has high ionic conductivity and can be synthesized by ball milling or solution processing. Ball milling has been attractive because it provides the easiest route to access amorphous LPS with a conductivity of 3.5 × 10^–4 S cm^–1 (20 °C). However, achieving the complete reaction of precursors via ball milling can be difficult, and most literature reports use X-ray diffraction (XRD) or Raman spectroscopy to confirm sample purity, both of which have limitations. Furthermore, the effect of residual precursors on ionic conductivity and lithium metal cycling is unknown. In this work, we illustrate the importance of multimodal characterization to determine LPS phase and chemical purity. To determine the residual Li₂S content in LPS, we show that (1) XRD and ³¹P solid state nuclear magnetic resonance (ssNMR) are insufficient and (2) Raman loses sensitivity at concentrations below 12 mol% Li₂S. Most importantly, we show that ⁷Li ssNMR is highly sensitive. Using ⁷Li ssNMR, we investigate the effect of ball milling parameters and develop a robust and highly reproducible procedure for pure LPS synthesis. We find that as the residual Li₂S precursor content increases, LPS conductivity decreases and lithium metal batteries exhibit higher overpotentials and poor cycle life. Furthermore, our work reveals the importance of multimodal characterization techniques for amorphous solid-state electrolyte characterization and will enable better synthetic strategies for highly conductive electrolytes for efficient energy-dense solid-state lithium metal batteries.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Univ. of Chicago, Materials Research Science & Engineering Center (MRSEC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1840904

Journal Information:: Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 35 Vol. 9; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Importance of multimodal characterization and influence of residual Li2S impurity in amorphous Li3PS4 inorganic electrolytes

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Importance of multimodal characterization and influence of residual Li₂S impurity in amorphous Li₃PS₄ inorganic electrolytes