Volume 45, Issue 4 pp. 6002-6014
RESEARCH ARTICLE

Enhanced performance of Li-S battery by constructing inner conductive network and outer adsorption layer sulfur-carbon composite

Ling Zhu

Ling Zhu

School of Physics and Electromechanical Engineering, School of Chemistry and Chemical Engineering, College of Biology and Environment Sciences, Jishou University, Jishou, China

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Renwen Hu

Renwen Hu

National-Provincial Laboratory of Special Function Thin Film Materials, Xiangtan University, Xiangtan, China

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Yanhong Xiang

Yanhong Xiang

School of Physics and Electromechanical Engineering, School of Chemistry and Chemical Engineering, College of Biology and Environment Sciences, Jishou University, Jishou, China

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Xuexian Yang

Xuexian Yang

School of Physics and Electromechanical Engineering, School of Chemistry and Chemical Engineering, College of Biology and Environment Sciences, Jishou University, Jishou, China

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Zhe Chen

Zhe Chen

School of Physics and Electromechanical Engineering, School of Chemistry and Chemical Engineering, College of Biology and Environment Sciences, Jishou University, Jishou, China

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Lizhi Xiong

Lizhi Xiong

School of Physics and Electromechanical Engineering, School of Chemistry and Chemical Engineering, College of Biology and Environment Sciences, Jishou University, Jishou, China

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Xianwen Wu

Corresponding Author

Xianwen Wu

School of Physics and Electromechanical Engineering, School of Chemistry and Chemical Engineering, College of Biology and Environment Sciences, Jishou University, Jishou, China

Correspondence

Xianwen Wu, School of Physics and Electromechanical Engineering, School of Chemistry and Chemical Engineering, College of Biology and Environment Sciences, Jishou University, Jishou 416000, China.

Email: [email protected]

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Zeqiang He

Zeqiang He

School of Physics and Electromechanical Engineering, School of Chemistry and Chemical Engineering, College of Biology and Environment Sciences, Jishou University, Jishou, China

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Weixin Lei

Weixin Lei

National-Provincial Laboratory of Special Function Thin Film Materials, Xiangtan University, Xiangtan, China

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First published: 01 December 2020
Citations: 35

Funding information: Key Planned Science and Technology Project of Xiangxi Tujia & Miao Autonomous Prefecture, Grant/Award Number: 2018GX2001; National Natural Science Foundation of China, Grant/Award Numbers: 11602094, 51762017, 51862008, 52064013, 52064014; Natural Science Foundation of Hunan Province, Grant/Award Numbers: 2017JJ2216, 2019JJ50485, 2020JJ4505; Program of Youth Talent Support for Hunan Province, Grant/Award Number: 2018RS3098; the key Program of Hunan Provincial Education Department, Grant/Award Number: 18A285

Summary

A liquid phase deposition method is performed to prepare acetylene black/sulfur (AB/S) composites, and in-situ polymerization is utilized to synthesize polypyrrole (PPY) on the surface of AB/S. The coral-like structured AB provides huge micropores and vast specific surface area for bonding sulfur, and supplies a 3D conductive matrix for enhancing the conductivity of composite. A plenty of ion channels served by PPY layer can promote the Li+ migration and alleviate the electrode polarization. In addition, the dissolution and diffusion of lithium polysulfides in the electrolyte can be restrained by PPY coating. The volume variation of cathode in the charge-discharge process can be relieved by the high elastic PPY layer combined with the 3D matrix of AB. The Li-sulfur battery (LSB) with the AB/S@PPY cathode exhibits an extraordinary cycle stability and rate adaptability with the specific capacities of 1207.1 mAh g−1 at the initial discharge process and 884.4 mAh g−1 even after 100 cycles at 0.2 C. Furthermore, an excellent specific capacity of 675.3 mAh g−1 has been delivered by the AB/S@PPY electrode at a high discharge rate of 2 C.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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