Carbon-coated Li2S cathode for improving the electrochemical properties of an all-solid-state lithium-sulfur battery using Li2S-P2S5 solid electrolyte
- Authors
- Choi, Sunho; Yoon, Insang; Nichols, William T.; Shin, Dongwook
- Issue Date
- May-2018
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Solid electrolyte; Lithium sulfide; Lithium sulfur battery; Carbon coating; All-solid-state battery
- Citation
- CERAMICS INTERNATIONAL, v.44, no.7, pp.7450 - 7453
- Indexed
- SCIE
SCOPUS
- Journal Title
- CERAMICS INTERNATIONAL
- Volume
- 44
- Number
- 7
- Start Page
- 7450
- End Page
- 7453
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/16972
- DOI
- 10.1016/j.ceramint.2018.01.104
- ISSN
- 0272-8842
- Abstract
- Li2S is coated with carbon to improve the electrical conductivity of the composite cathode in all-solid-state lithium-sulfur batteries. Carbon is applied by thermal evaporation from a polyacrylonitrile (PAN) source at 600 degrees C for 5 h. It is shown that the carbon coating is impurity free, and the crystallinity of Li2S is well maintained. The electronic conductivity of Li2S is dramatically improved from 9.21 x 10(-9) S cm(-1) to 2.39 x 10(-2) S cm(-1) upon carbon coating. An all-solid-state battery prepared with the carbon-coated Li2S shows a high initial capacity of 585 mAh g(-1) (g of Li2S) that increases up to 730 mAh g(-1) (g of carbon-coated Li2S) by the 10th cycle. This high capacity is stable throughout the 25 cycles tested, with an excellent coulombic efficiency of 99%. Carbon-coated Li2S is advantageous for all-solid-state batteries due to the increased electrical conductivity, while allowing a reduction of the total carbon content present in the composite cathode.
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