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Abstract
Lithium sulfide is an attractive cathode material with a high theoretical specific capacity. However, the poor cycle life and rate capability have remained significant challenges, preventing its practical application. Here, Li2S spheres with size control have been synthesized for the first time, and a CVD method for converting them into stable carbon-coated Li2S core-shell particles has been successfully employed. These [email protected] particles with protective and conductive carbon shells show promising specific capacities and cycling performance with a high initial discharge capacity of 972 mAh g -1 Li2S at the 0.2C rate. Even with no added carbon, a very high Li2S content electrode composed of 98 wt % 1 μm [email protected] spheres and 2 wt % binder shows rather stable cycling performance, and little morphology change after 400 cycles at the 0.5C rate. © 2014 American Chemical Society.
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