首页|Construction of plum-branch-like CoSe2@N-Doped carbon/carbon fiber with dual protective mechanisms for enhanced lithium storage
Construction of plum-branch-like CoSe2@N-Doped carbon/carbon fiber with dual protective mechanisms for enhanced lithium storage
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Cobalt selenide(CoSe2)emerges as a highly promising anode material for lithium-ion batteries(LIBs)owing to its high theoretical capacity and cost-effectiveness.Despite these merits,its practical utilization faces challenges stemming from substantial volume fluctuations and limited electronic conductivity.To tackle these issues,a plum-branch-like structure of CoSe2@N-doped carbon that embedded in one-dimensional N-doped carbon fibers(CoSe2@NC/CFs),is successfully synthesized through an in-situ confinement method.Well-defined CoSe2@NC nanoparticles,featuring diameters between 20～30 nm,are uniformly dispersed on both the inner and outer surfaces of the carbon fibers.The distinctive architecture of CoSe2@NC/CFs ensures an increased number of active sites,elevated electronic conductivity,alleviated volume expansion,and accelerated reaction kinetics.Consequently,the CoSe2@NC/CFs exhibits remarkable cycling performance and exceptional rate capability.Operating at a current density of 1000 mA g-1,the CoSe2@NC/CFs anode sustains a capacity of 664 mA h g-1 with no obvious capacity decay over 500 cycles.Even at a high current density of 5000 mA g-1,it maintains a capacity of 445 mA h g-1 with a mere 0.02％capacity decay per cycle.This study introduces a novel approach to anode material design,showcasing significant advancements in lithium-ion battery technology.
Ying Wang、Ming Zhang、Lei Chen、Yanjuan Li、Qingqing Wang、Xiaobin Wu、Lingdi Shen、Xiao Yan
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School of Chemistry&Materials Science,Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials,Jiangsu Normal University,Xuzhou,Jiangsu 221116,China
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