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Indexed by:Journal Papers

Date of Publication:2019-10-15

Journal:JOURNAL OF POWER SOURCES

Included Journals:EI、SCIE

Volume:437

ISSN No.:0378-7753

Key Words:MnS nanoparticles; Core-shell structure; Plasma evaporation; Lithium-ion batteries

Abstract:Despite possessing a high theoretical capacity, MnS has a rather complex lithium kinetic diffusion and poor mechanical stability that hinders its application in energy storage devices like lithium-ion batteries. This study is focused on overcoming the drawbacks of MnS anode material by assembling a carbon-constraint MnS nano composite in a core-shell configuration. This structure is obtained by a simple route involving DC plasma evaporation of Mn@C nanoparticles and posterior thermal sulfurization process. As anode material in a Li-ion battery, MnS@C-300 attains high specific capacity of 890 mAh g(-1) after 500 cycles at 500 mA g(-1). It also shows remarkable high rate capability with capacity values of 705, 684, 643, 578, and 495 mAh g(-1) at current densities of 100, 200, 500, 1000, and 2000 mA g(-1), respectively. This exceptional electrochemical response is endorsed to the synergetic effect of the smart design of a core-shell architecture. The carbonaceous shell enhances the lithium-ion diffusion towards the active MnS core and preserves structural stability during the long cycling process.