Synthesis and electrochemical properties of sulfur doped-Li xMnO 2− yS y materials for lithium secondary batteries

Abstract

Sulfur doped lithium manganese oxides (Li x MnO 2− y S y ) were prepared by ion exchange of sodium for lithium in Na x MnO 2− y S y precursors obtained by a sol–gel method. These materials had the nano-crystallite size, which was composed of grain size of about 100–200 nm. Especially, Li 0.56MnO 1.98S 0.02 delivered the initial discharge capacity of 170 mAh g −1 and gradually increased the discharge capacity of 220 mAh g −1 until 50 cycles. Moreover, it showed an excellent cycling behavior, although its original structure transformed into the spinel phase during cycling.