Carbon encapsulated nanosheet-assembled MoS<inf>2</inf>nanospheres with highly reversible lithium storage

Release time:2023-10-19 Hits:

Key Words:Molybdenum compounds;Amorphous carbon - Anodes - Lithium - Lithium alloys - Lithium compounds - Lithium-ion batteries - Nanosheets - Nanospheres;Assembled structures - Electrochemical energy storage - Electrochemical lithium storages - Electronic conductivity - High specific capacity - High-temperature calcination - Lithium-ion transport - Polyvinyl pyrrolidone

Abstract:Carbon encapsulated nanosheet-assembled MoS<inf>2</inf>(C@MoS<inf>2</inf>) nanospheres have been synthesized using poly(vinylpyrrolidone) (PVP) as surfactant and carbon source via hydrothermal approach in combination with high-temperature calcination process. PVP plays an important role in the formation of nanosheet-assembled MoS<inf>2</inf>nanospheres, which can be in-situ converted into amorphous carbon to encapsulate MoS<inf>2</inf>. When evaluated for electrochemical lithium storage properties, the C@MoS<inf>2</inf>nanospheres exhibit enhanced electrochemical energy storage performances compared to the bare MoS<inf>2</inf>nanosheets, including high specific capacity (1135.8&nbsp;mAh&nbsp;g^&minus;1at 0.1&nbsp;A&nbsp;g^&minus;1), excellent rate capability (384.4&nbsp;mAh&nbsp;g^&minus;1at 8&nbsp;A&nbsp;g^&minus;1and 330.5&nbsp;mAh&nbsp;g^&minus;1at 10&nbsp;A&nbsp;g^&minus;1), and good cycling stability (97.03% capacity retention after 100 cycles at 0.5&nbsp;A&nbsp;g^&minus;1). The enhanced lithium storage performances of the C@MoS<inf>2</inf>nanospheres can be ascribed to the boosted electronic conductivity arising from PVP derived carbon, and the facilitated lithium ion transport due to the shorter diffusion length of MoS<inf>2</inf>nanosheet-assembled structures. &copy; 2016 Elsevier B.V.

Volume:304

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Translation or Not:no