Carbon-coated Li2S cathode for improving the electrochemical properties of an all-solid-state lithium-sulfur battery using Li2S-P2S5 solid electrolyte. Issue 7 (May 2018)

• Record Type: Journal Article
• Authors: Choi, Sunho; Yoon, Insang; Nichols, William T.; Shin, Dongwook
• Is Part Of: Ceramics international. Volume 44:Issue 7(2018)
• Page Start: 7450
• Page End: 7453
• Publication Date: 2018-05
• Subjects: Solid electrolyte -- Lithium sulfide -- Lithium sulfur battery -- Carbon coating -- All-solid-state battery; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.01.104
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Li2 S 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 °C for 5 h. It is shown that the carbon coating is impurity free, and the crystallinity of Li2 S is well maintained. The electronic conductivity of Li2 S is dramatically improved from 9.21 × 10 −9 S cm −1 to 2.39 × 10 −2 S cm −1 upon carbon coating. An all-solid-state battery prepared with the carbon-coated Li2 S shows a high initial capacity of 585 mAh g −1 (g of Li2 S) that increases up to 730 mAh g −1 (g of carbon-coated Li2 S) by the 10th cycle. This high capacity is stable throughout the 25 cycles tested, with an excellent coulombic efficiency of 99%. Carbon-coated Li2 S 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.