High lithium ion conducting Li2S-GeS2-P 2S5 glass-ceramic solid electrolyte with sulfur additive for all solid-state lithium secondary batteries

James E. Trevey, Yoon Seok Jung, Se Hee Lee

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Glass-ceramic Li2S-GeS2-P2S5 electrolytes were prepared by a single step ball milling (SSBM) process. Various compositions of Li4-xGe1-xPxS4 from x = 0.70 to x = 1.00 were systematically investigated. Structural analysis by X-ray diffraction (XRD) showed gradual increase of the lattice constant followed by significant phase change with increasing GeS2. All-solid-state LiCoO2/Li cells were tested by constant-current constant-voltage (CCCV) charge-discharge cycling at a current density of 50 μA cm-2 between 2.5 and 4.3 V (vs. Li/Li+). In spite of the high conductivity of the solid-state electrolyte (SSE), LiCoO2/Li cells showed a large irreversible reaction especially during the first charging cycle. Limitation of instability of Li2S-GeS2-P 2S5 in contact with Li was solved by using double layer electrolyte configuration: Li/(Li2S-P2S 5/Li2S-GeS2-P2S5)/ LiCoO2. LiCoO2 with SSEs heat-treated with elemental sulfur at elevated temperature exhibited a discharge capacity of 129 mA h g -1 at the second cycle and considerably improved cycling stability.

Original languageEnglish
Pages (from-to)4243-4247
Number of pages5
JournalElectrochimica Acta
Issue number11
Publication statusPublished - 2011 Apr 15

Bibliographical note

Funding Information:
This work has been supported by DARPA/DSO. Dr. Yoon Seok Jung acknowledges the Korea Research Foundation Grant funded by the Korean Government [KRF-2008-357-D00066].

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry


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