Protected bis(hydroxyorganyl) polysulfides as modifiers of Li/S battery electrolyte

• DOI: 10.1016/j.electacta.2010.11.064
• Publication Date: 2010-12-01T04:23:06Z
• Authors: Boris A. Trofimov; Marina V. Markova; Lyudmila V. Morozova; Galina F. Prozorova; Svetlana A. Korzhova; Myung D. Cho; Vadim V. Annenkov; Al’bina I. Mikhaleva
• Keywords: Polysulfide

Abstract The protected bis(hydroxyorganyl) polysulfides synthesized have been tested as modifiers of electrolyte of lithium-sulfur rechargeable batteries. The best result (35% increase of the battery capacity at the 50th cycle) was attained using 5 wt.% of 2,2,12,12-tetramethyl-4,10-diphenyl-3,11-dioxa-6,7,8-trithia-2,12-disilatridecane. Bis(hydroxyorganyl) polysulfides protected at the hydroxyl group have been synthesized for the first time by the reaction of oxiranes with sodium polysulfide (ethanol, NaHCO 3 , 12 h, 20–25 °C) in yield 21–87%. For the hydroxyl protection in the hydroxy polysulfides, the acetal, tri(methyl)silyloxy or tri(ethoxy)silyl protecting groups were employed.