Hierarchical MoS2@Polypyrrole core-shell microspheres with enhanced electrochemical performances for lithium storage

Abstract

Advanced anode materials for lithium ion batteries are central to the area of electrical energy storage devices. Herein, we have developed a two-step strategy for synthesizing MoS2@polypyrrole (MoS2@PPY) core-shell microspheres. In such a novel architecture, the MoS2 microspheres are homogeneously wrapped by conductive polypyrrole coating forming core-shell microspheres. As a preliminary test, the obtained MoS2@PPY microspheres exhibit greatly enhanced electrochemical performances for lithium storage compared with un-modified MoS2 microspheres. The MoS2@PPY microsphere electrode displays a high specific capacity of 1012 mAh g−1 after 200 cycles at 200 mA g−1 and high rate performance (600 mAh g−1 at 4000 mA g−1). The superior electrochemical performances are attributed to the advantageous combination of hierarchical microsphere structure and conductive PPY coating.