Probing Li ion dynamics in amorphous xLi₂SO₄∙(1-x)LiPO₃ by quasielastic neutron scattering

Journal Article · 16 February 2019 · Solid State Ionics

DOI: https://doi.org/10.1016/j.ssi.2019.02.004 · OSTI ID:1495936

Heitmann, Tom ^[1]; Hester, Gavin ^[2]; Mitra, Saibal ^[2]; Calloway, Thomas ^[2]; Tyagi, Madhu Sudan ^[3]; Miskowiec, Andrew J.  ^[4]; Diallo, Souleymane ^[4]; Osti, Naresh C.  ^[4]; Mamontov, Eugene  ^[4]

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1. University of Missouri, Columbia, MO (United States)
2. Missouri State University, Springfield, MO (United States)
3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The diffusion dynamics of a series of lithium sulfate substituted phosphate glass materials xLi₂SO₄∙(1-x)LiPO₃ has been probed by quasielastic neutron scattering. Amorphous Li ion conductors are attractive as electrolyte materials for all-solid state batteries because they are highly isotropic and chemically stable. Local disorder is expected to reduce barriers to ion migration – leading to improved ionic conductivity relative to their crystalline counterpart – while minimizing unwanted electron transport. We report Li self-diffusion in these materials on a length scale comparable to the interatomic spacings, obtaining values D ≃ 55 ± 4 × 10^-8 cm²/s at 450 K. Elastic neutron scattering measurements show an alteration of the phosphate chain backbone of the glass material.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1495936
• Journal Information: Solid State Ionics, Journal Name: Solid State Ionics Journal Issue: C Vol. 334; ISSN 0167-2738
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English