聚苯胺包覆的硫化锌-碳纳米管用作正极载体材料提高锂硫电池性能

doi:10.11896/cldb.22060085

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Abstract Lithium-sulfur batteries (LSBs) have attracted increasing attention due to their excellent specific capacity and energy density. However, obstructions of polysulfide dissolution, the volume expansion, and the poor conductivity usually result in a significant capacity decrease and sluggish reaction kinetics during cycling. Herein, we fabricated a novel ZnS-CNTs/S@PANI cathode to suppress the aforementioned obstacles, in which the ZnS-decorated CNTs were used as backbone to support sulfur and a polyaniline (PANI) layer was then coated on them. The conductive CNT network permitted fast electron/ion transfer and meanwhile accommodated the volume expansion. The decorated ZnS quantum dots (QDs) provided abundant polar sites on CNT surface facilitating the chemisorption of polysulfides. The conductive PANI coating layer acted multiple roles as a conducting additive, an adsorbing agent, and a physical barrier, which inhibited the shuttle of polysulfides and bettered the kinetics. Therefore, the obtained ZnS-CNTs/S@PANI cathode provided a high reversible capacity of 952.33 mAh·g^-1 at 0.5 C, and still maintained an excellent capacity of 776.37 mAh·g^-1 even after 150 cycles. The same excellent rate performance of 633.62 mAh·g^-1 was also obtained at 2 C. Therefore, this study provides a simple and low-cost method for the preparation of high-performance Li-S battery cathode materials.

Key words： lithium-sulfur batteries ZnS cathode polyaniline

Published: Online: 2024-01-16

Fund:National Natural Science Foundation of China (11974110, 61974041), the ‘The Six Top Talents’ of Jiangsu Pro-vince (XCL-052), and the Qing Lan Project of Jiangsu Province.

Corresponding Authors: Haihong Yin,Ph.D.,a professor of Nantong University. In 2005,he graduated from Nanjing Normal University,majoring in physical electronics,with a master’s degree,and entered Nantong University in the same year; in 2012,he graduated from East China Normal University,majoring in microelectronics and solid-state electronics,with a doctoral degree. His research interest includes the synthesis of multifunctional nanomaterials and their applications in electrochemical batteries,photocatalysis,sensing and optoelectronics. He has published more than 40 papers in international journals such as J. Mater. Chem.,Appl. Phys. Lett.,Nanoscale,ACS Appl. Mater. Interfaces,J Colloid. Interf. Sci.,Dalton Trans.,Electrochimica Acta,etc.,and more than 20 authorized Chinese invention patents.hhyin@ntu.edu.cn

About author: Yuxiang Zhou,received a bachelor’s degree in engineering from Xinglin College of Nantong University in June 2020. He is currently a master student at the School of Information Science and Technology,Nantong University,conducting research under the guidance of professor Yin Haihong. At present,the main research field is the research and preparation of cathode mate-rials for lithium-sulfur batteries.

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	ZHOU Yuxiang
	SHI Tianyu
	ZHAO Chenyuan
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	SONG Changqing
	YU Ke

Cite this article:

ZHOU Yuxiang,SHI Tianyu,ZHAO Chenyuan, et al. ZnS-Decorated CNTs as Backbone with Polyaniline Coating Layer to Boost the Performance Lithium-Sulfur Batteries[J]. Materials Reports, 2024, 38(1): 22060085-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22060085 OR http://www.mater-rep.com/EN/Y2024/V38/I1/22060085

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