Plasma milling modified Sb2S3-graphite nanocomposite as a highly reversible alloying-conversion anode material for lithium storage

Poor reversibility of conversion and alloying reactions for Sb 2 S 3 limits its application as high capacity anode for rechargeable lithium storage. Herein a facile high-efficiency plasma assisted milling (P-milling) was used to create Sb 2 S 3 -C hybrid nanostructure with disk-like Sb 2 S 3 nanograins wrapped within ultrathin graphite nanosheets . Benefiting from the high structure stability and excellent Li + ion diffusion kinetics in the graphite wrapped Sb 2 S 3 nanostructure , highly reversible conversion and alloying reactions are maintained throughout the long-term cycles. The Sb 2 S 3 -C nanocomposite anode demonstrates a high stable capacity of 638.2 mA h g −1 after 250 cycles at 200 mA g −1 between 0.01 and 3.0 V vs. Li/Li + , with a high initial Coulombic efficiency of 78.3%. A reversible capacity of 496.1 mA h g −1 is obtained after 500 cycles even at higher current rate of 1 A g −1 , much superior to those of the unmilled Sb 2 S 3 -C and P-milled Sb 2 S 3 anodes. These demonstrate that P-milling could be a promising strategy to create high performance metal chalcogenide anode materials involved both conversion and alloying reactions toward lithium storage.