Preparation and Electrochemical Performance of Zn2VO4/N-CNFs Free-Standing Composite Interlayer by Electrospinning Technology
Zn,V bimetallic compound-carbon nanofibers free-standing interlayer(Zn2VO4/N-CNFs)with 3D mesh structure was designed for lithium sulfur(Li-S)batteries by electrospinning technology.The results show that the pyridine nitrogen and pyrrole nitrogen can strongly interact with lithium-ion,Zn2VO4 has a strong adsorption and catalytic effect on lithium polysulfide.The multi-layer carbon nanofiber network can also provide long-range electron conduction paths while capturing polysulfides,which can promote electron transfer and store electrolyte at the same time,providing the space for electrochemical reaction.The Zn2VO4/N-CNFs interlayer can play the bifunctional role of adsorbing and facilitating the transformation of lithium polysulfide.The battery with Zn2VO4/N-CNFs interlayer can deliver an initial discharge capacity of 796.1 mAh·g-1 at 0.2 C,and keep at 727.2 mAh·g-1 after 100 cycles with the capacity retention rate of 91.3%.In addition,the battery delivers an initial capacity of 593.4 mAh·g-1 at 1.0 C,and retains at 353.3 mAh·g-1 after 1000 cycles with corresponding capacity attenuation of 0.0024%per cycle.
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