title: Preventing the dissolution of lithium polysulfides in lithium-sulfur cells by using Nafion-coated cathodes.
abstract: The principal drawback of lithium-sulfur batteries is the dissolution of long-chain lithium polysulfides into the electrolyte, which limits cycling performance. To overcome this problem, we focused on the development of a novel cathode as well as anode material and designed Nafion-coated NiCrAl/S as a cathode and lithium powder as an anode. Nafion-coated NiCrAl/S cathode was synthesized using a two-step dip-coating technique. The lithium-powder anode was used instead of a lithium-foil anode to prohibit dendrite growth and to improve on the electrochemical behaviors. The cells showed an initial discharge capacity of about 900 mA g(-1) and a final discharge capacity of 772 mA g(-1) after 100 cycles at 0.1 C-rate. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) demonstrate that using the Nafion-coated NiCrAl/S cathode can suppress the dissolution of long-chain lithium polysulfides.
authors: Department of Materials Science and Engineering, Korea University, Anam-dong, Sungbuk-gu, Seoul, 136-701 (Korea), Fax: (+82) 2-928-3584.
authors: Soo Jung
authors: SJ
authors: Oh
authors: Jun Kyu
authors: JK
authors: Lee
authors: Woo Young
authors: WY
authors: Yoon
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D013440:Sulfides / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*
chemical_list: D005465:Fluorocarbon Polymers; D013440:Sulfides; C040402:perfluorosulfonic acid; D013455:Sulfur; C032915:polysulfide; D008094:Lithium
keywords: batteries; cathodes; electrochemistry; electrolytes; polymers