▎ 摘　　要

Molybdenum sulfides have been researched actively for application in electrochemical energy storages and conversions. For molybdenum sulfides, modifications in stoichiometry and crystal structure can lead to enhancements in their electro-chemical properties. However, even though performance of crystalline molybdenum disulfide-based lithium ion battery (LIB) anodes have been investigated extensively, amorphous molybdenum sulfide-based anodes still need to be researched. Herein we report specific capacity as high as 1872 mAh/g observed from non-stoichiometric partially amorphous molybdenum sulfide formed on chemically exfoliated graphene (MoSx-rGO) as a LIB anode. According to our analysis, amorphous part consisting [Mo3S13]2-building blocks contains an excess amount of sulfur as bridging, shared, or terminal S22-, which contribute significantly in enhancing the capacity of the anode. In depth electrochemical investigations and analysis suggest that MoSx-rGO undergoes a different lithiation mechanism from crystalline MoS2, and consequently exhibits such high capacity with excellent stability at least up to 200 cycles and a decreased c-rate dependence. (c) 2020 Elsevier Ltd. All rights reserved.