S/MCNT/Fe3O4正极材料制备及电化学性能研究

doi:10.19964/j.issn.1006-4990.2021-0498

Abstract

Abstract:

Lithium?sulfur battery has attracted extensive attention from researchers due to the high theoretical energy density，but the actual energy density is still limited by the low conductivity of sulfur and the shuttle effect of the intermediate polysulfides，etc.To solve these issues，herein sulfur was loaded onto multi?walled carbon nanotube with the porous framework formed through sulfur melting method，followed by compounding it with the polar oxide ferroferric oxide via grinding method to finally obtain the as?prepared sulfur/multi?walled carbon nanotube/ferroferric oxide（S/MCNT/Fe₃O₄） cathode materials.The lithium sulfur battery assembled based on this cathode material had an initial discharge specific capacity of up to 908.6 mA·h/g at 1C rate.After 250 cycles，the capacity decay rate per cycle was 0.2% and the average coulomb efficiency was about 99%.When the current density was increased to 3C，it still had a capacity of 636.5 mA·h/g，exhibiting excellent rate performance.

Key words: lithium?sulfur batteries, cathode materials, ferroferric oxide, polysulfides

CLC Number:

TM91

QIU Zhixu,ZHU Shaokuan,WEI Yuxiao,LONG Jiaying,HUANG Dongchuang,SHAO Jiaojing. Study on preparation and electrochemical performance of S/MCNT/Fe₃O₄ cathode materials[J]. Inorganic Chemicals Industry, 2022, 54(6): 73-77.

Figures/Tables 5

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References 21

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Study on preparation and electrochemical performance of S/MCNT/Fe₃O₄ cathode materials

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Study on preparation and electrochemical performance of S/MCNT/Fe3O4 cathode materials