摘要
Li-S battery has attracted great attention due to its high specific capacity and energy density.However,the serious polysulfides shuttle effect,low conductivity of sulfur and discharge product of lithium sulfide limit their application in commercial energy storage system.To solve the above problems,this work designs and constructs C@CoSe_(2) nano wire material as sulfur host for realizing high-performance Li-S battery.By combing the high conductivity,strong chemisorption,promising catalytic capacity and unique nanowire array structure,the C@CoSe_(2)/S electrode demonstrates a high specific capacity of 1264 mAh·g^(-1) with a low capacity decay of 0.051%per cycle at 0.2 C over 200 cycles.As expected,the battery delivers outstanding capacity retention over 1000 cycles at5 C and the decay is as low as≈0.026% per cycle.Moreover,even at higher sulfur loading of 5.1 mg·cm^(-2),the battery could still remain a stable areal capacity of 5.02 mAh·cm^(-2) at 0.2 C. More importantly,the experimental data and theoretical calculation results reveal that the internal mechanism of the improved electrochemical performance is the catalytic activation of CoSe_(2) on poly sulfides.
出处
《Rare Metals》
SCIE
EI
CAS
CSCD
2021年第11期3147-3155,共9页
稀有金属（英文版）
基金
financially supported by the Natural Science Foundation of Heilongjiang Province(No.LH2020B008)
the State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(No.2019DX13)
China Postdoctoral Science Foundation(Nos.2016M600253 and 2017T100246)
the Post-doctoral Foundation of Heilongjiang Province(No.LBH-Z16060)。
