Abstract
Transition metal sulfide(TMS)anodes exhibit the characteristics of phase stability and high capacity for lithium/sodium-ion batteries(LIBs/SIBs).However,the TMS anodes often suffer from poor electronic conductiv-ity,low ionic diffusion and large volume expansion during Li/Na-ion intercalation significantly impairing the Li/Na-storage performance.Herein,a long chain heterostructure composed of the Co9S8 and SnS are first reported,which can generate rich phase interfaces,and small crystal domains.The unique structure can facilitate the properties of reactivity,conductivity and ionic diffusion.In addition,the heterostructure surface is modified by the N-doped carbon(N-DC@(CoSn)S),successfully improving the structural stability.The synergistic effects of Co9S8/SnS heterostructure and coated carbon layer effectively increase the capacity and cycling stability.The N-DC@(CoSn)S anode delivers enhanced high specific capacities of 820.6 mAh·g-1 at 1.0 A·g-1 after 500 cycles for LIBs and 339.2 mAh·g-1 at 0.5 A·g-1 after 1000 cycles for SIBs,respectively.This work is expected to provide a material design idea for preparing LIBs/SIBs with high capacity and long cycling life.
基金项目
国家自然科学基金(52271211)
国家自然科学基金(52171207)
HORIZON-Marie Sk?odowska-Curie Actions-2021-PF(101065098)
湖南省自然科学基金(2022JJ40162)
湖南省教育厅科研项目(21B0406)
Science and Technology Innovation Program of Hunan Province(2022RC3037)
NETL
NSTL
万方数据