Abstract
Tin sulfide(SnS2)anodes have garnered significant attention within emerging energy storage technol-ogies.However,the application of SnS2 is curtailed due to its inherent limitations,including poor cyclic stability and inevitable volumetric expansion upon cycling.This study reports the successful fabrication of an innovative SnS2-based composite,featuring an eggshell-like structured nitrogen-doped carbon coating,referred to as SnS2@NxC.This novel architecture,wherein SnS2 acts as the core encapsulated by a nitrogen-doped carbon shell,characterized by a void space between the shell and core,is crucial in mitigating volumetric expansion.This configuration contributes to maintaining the structural integrity of the composite materials,even under the stresses of continuous cycling.Nitrogen within the carbon matrix enhances conductivity and promotes the formation of a more robust and stable solid electrolyte interphase(SEI)layer.Experimental investigations have substantiated the electrochemical superiority of the SnS2@NxC electrode,demonstrating a specific capacity of 701.8 mA·h·g-1 after 1000 cycles at 0.5 A·g-1 and maintaining a capacity of 597.2 mA·h·g-1 after 400 cycles at a heightened current density of 2 A·g-1.These findings underscore the exceptional cyclic performance and durability of the SnS2@NxC electrode.
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