改性乙炔黑对锂硫电池电化学性能的影响

doi:10.11896/cldb.17070243

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Abstract Modified acetylene black (H-AB) was treated by concentrated nitric acid steam. Then the sulfur/H-AB composite was fabricated by thermal treatment. The results from XRD, FTIR, SEM, TEM and N₂ sorption measurements indicated that the surface of acetylene black introduced carboxyl functional groups, and specific surface area and pore size all increased after treated by concentrated nitric acid steam. The sulfur particles were uniformly coated on the acetylene black surface. The electrochemical tests showed that the elemental sulfur and lithium polysulfides were fixed by introducing strong hydrophilic functional groups such as carboxyl groups. Thus the shuttle effect caused by dissolving of lithium polysulfides could be effectively inhibited. At the same time, the contact impedance between active substances and electrolytes could be reduced and the electrochemical performance of the sulfur cathode was improved. The discharge capacity and cycle performance of S/H-AB composite were better than unmodified acetylene black/sulfur composite. After 100 cycles, the discharge capacity still remained at 563 mAh·g^-1, much higher than that of sulfur cathode with pristine acetylene black (406.9 mAh·g^-1).

Key words： modified acetylene black cycling performance composite lithium/sulfur battery

Published: 25 April 2020

CLC number:

TM912

Fund:This work was financially supported by Taiyuan University of Science and Technology Scientific Research Initial Funding (20192035), Jincheng Science and Technology Planning Projects (20198037), Shanxi Science and Technology Platform Projects (201805D121005), Fund for Shanxi Key Subjects Construction.

About author:: Jin Guoreceived her Ph.D. degree in materials scie-nce and engineering from Taiyuan University of Science and Technology in 2019. Her research interest is structure design and performance of cathode materials for lithium sulfur batteries.
Mingang Zhangis a professor of Taiyuan University of Science and Technology. He received a Ph.D. in materials science and engineering from Xi’an Jiaotong University in 2001. He mainly works on the rare-earth magnetic materials and new energy materials. He has published 150 research papers and 5 patents.

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	GUO Jin
	LI Zhanlong
	LIAN Jinyi
	YAN Xiaoyan
	ZHANG Mingang

Cite this article:

GUO Jin,LI Zhanlong,LIAN Jinyi, et al. Effects of Modified Acetylene Black on Electrochemical Properties of Lithium/Sulfur Batteries[J]. Materials Reports, 2020, 34(8): 8020-8024.

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http://www.mater-rep.com/EN/10.11896/cldb.17070243 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8020

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