Abstract
The sluggish redox kinetics of polysulfides in lithium-sulfur(Li-S)batteries are a significant obstacle to their widespread adoption as energy storage devices.However,recent studies have shown that tungsten oxide(WO3)can facilitate the conversion kinetics of polysulfides in Li-S batteries.Herein,we fabricated host materials for sulfur using nitrogen-doped carbon nanotubes(N-CNTs)and WO3.We used low-cost components and simple procedures to overcome the poor electrical conductivity that is a disadvantage of metal oxides.The composites of WO3 and N-CNTs(WO3/N-CNTs)create a stable framework structure,fast ion diffusion channels,and a 3D electron transport network during electrochemical reaction pro-cesses.As a result,the WO3/N-CNT-Li2S6 cathode demonstrates high initial capacity(1162 mA·h·g-1 at 0.5 C),excellent rate performance(618 mA·h·g-1 at 5.5 C),and a low capacity decay rate(0.093％up to 600 cycles at 2 C).This work presents a novel approach for preparing tungsten oxide/carbon composite catalysts that facilitate the redox kinetics of polysulfide conversion.
基金项目
Open Project Program of the State Key Laboratory of Materials-Oriented Chemical Engineering(KL21-05)
Instrumental Analysis Center,Jiangsu University of Science and Technology()
万方数据