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Jung, Yoon Seok
Electrochemical Solid-State Energy Storage Lab
Research Interests
  • Batteries, All-solid-state batteries, solid electrolytes, electrodes, atomic layer deposition,energy storage devices

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Preparation of Li2S-GeSe2-P2S5 electrolytes by a single step ball milling for all-solid-state lithium secondary batteries

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Title
Preparation of Li2S-GeSe2-P2S5 electrolytes by a single step ball milling for all-solid-state lithium secondary batteries
Author
Trevey, James E.Jung, Yoon SeokLee, Se-Hee
Keywords
Lithium battery; Solid-state battery; Solid electrolyte; Sulfide; Selenide
Issue Date
2010-08
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.195, no.15, pp.4984 - 4989
Abstract
Glass–ceramic and glass Li2S–GeSe2–P2S5 electrolytes were prepared by a single step ball milling (SSBM) process. Various compositions of Li4−xGe1−xPxS2(1+x)Se2(1−x) with/without heat treatment (HT) from x = 0.55 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 GeSe2. HT also affected the crystallinity. Incorporation of GeSe2 in Li2S–P2S5 kept high conductivity with a maximum value of 1.4 × 10−3 S cm−1 at room temperature for x = 0.95 in Li4−xGe1−xPxS2(1+x)Se2(1−x) without HT. All-solid-state LiCoO2/Li cells using Li2S–GeSe2–P2S5 as solid-state electrolytes (SE) 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 extremely high conductivity of the SE, LiCoO2/Li cells showed a large irreversible reaction especially during the first charging cycle. LiCoO2 with SEs heat-treated at elevated temperature exhibited a capacity over 100 mAh g−1 at the second cycle and consistently improved cycle retention, which is believed to be due to the better interfacial stability.
URI
https://scholarworks.unist.ac.kr/handle/201301/10019
DOI
10.1016/j.jpowsour.2010.02.042
ISSN
0378-7753
Appears in Collections:
ECHE_Journal Papers
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