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

Author(s)
Trevey, James E.Jung, Yoon SeokLee, Se-Hee
Issued Date
2010-08
DOI
10.1016/j.jpowsour.2010.02.042
URI
https://scholarworks.unist.ac.kr/handle/201301/10019
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.
Publisher
ELSEVIER SCIENCE BV
ISSN
0378-7753

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