APL Materials (Apr 2018)

Configuring PSx tetrahedral clusters in Li-excess Li7P3S11 solid electrolyte

  • Wo Dum Jung,
  • Bin-Na Yun,
  • Hun-Gi Jung,
  • Sungjun Choi,
  • Ji-Won Son,
  • Jong-Ho Lee,
  • Jong-Heun Lee,
  • Hyoungchul Kim

DOI
https://doi.org/10.1063/1.5011105
Journal volume & issue
Vol. 6, no. 4
pp. 047902 – 047902-6

Abstract

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We demonstrate that the Li-ion conductivity can be improved by adding a certain amount of Li (x = 0.25–0.5) as a charge carrier to the composition of glass-ceramic Li7+xP3S11. Structural analysis clarified that the structural changes caused by the ratio of ortho-thiophosphate tetrahedra PS43− and pyro-thiophosphate ditetrahedra P2S74− affect the Li-ion conductivity. The ratio of PS43− and P2S74− varies depending on x and the highest Li-ion conductivity (2.5 × 10−3 S cm−1) at x = 0.25. All-solid-state LiNi0.8Co0.15Al0.05O2/Li7.25P3S11/In-metal cell exhibits the discharge capacity of 106.2 mAh g−1. This ion conduction enhancement from excess Li is expected to contribute to the future design of sulfide-type electrolytes.