Promotion of reversible Li+ storage in transition metal dichalcogenides by Ag nanoclusters

作者：Ji, Ge; Yu, Yong; Yao, Qiaofeng; Qu, Baihua; Chen, Dongyun; Chen, Weixiang; Xie, Jianping; Lee, Jim Yang^*

来源：NPG Asia Materials, 2016, 8(3): e247.

DOI：10.1038/am.2016.21

• ANODE MATERIAL
• ELECTROCHEMICAL PERFORMANCES
• GRAPHENE SHEETS
• LITHIUM
• MOS2
• NANOPARTICLES
• CAPACITY
• SIZE
• NANOCOMPOSITES
• COMPOSITES

After years of development, improvement in the electrochemical properties of MoS2 through structural modifications has reached its limit. Further improvements in the Li+ storage properties of MoS2 must be based on an understanding of the Li+ storage mechanism in MoS2. On this basis, we have developed a novel ternary composite of graphene, MoS2 nanosheets and a small amount (1 wt%) of silver nanoclusters (NCs; MoS2/G/Ag). The presence of the Ag NCs in the composite is, however, instrumental and serves several purposes: immobilization of sulfur, increased association with Li+ and increased spacing between graphene sheets. The presence of this small amount of Ag NCs was able to increase the Li+ storage capacity of MoS2 by 60% (with a discharge capacity of similar to 1300 mAh g(-1) at 0.5 A g(-1) compared with 800-850 mAh g(-1) for a MoS2/graphene composite without the Ag NCs (MoS2/G)). The MoS2/G/Ag composite also exhibited a very impressive rate performance: discharge capacities of 1040 and 850 mAh g(-1) at the very high current densities of 1 and 5 A g(-1), respectively (the corresponding values from MoS2/G without the Ag NCs are 790 and 580 mAh g(-1)).

• 出版日期2016-3
• 单位浙江大学