Volume 44, Issue 13 pp. 10937-10945
SHORT COMMUNICATION

Synergistic effect of titanium-oxide integrated with graphitic nitride hybrid for enhanced electrochemical performance in lithium-sulfur batteries

Shanshan Yao

Corresponding Author

Shanshan Yao

Institute for Advanced Materials, College of Materials Science and Engineering, Jiangsu University, Zhenjiang, People's Republic of China

Correspondence

Shanshan Yao, Institute for Advanced Materials, College of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.

Email: [email protected]

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Youqiang Wang

Youqiang Wang

Institute for Advanced Materials, College of Materials Science and Engineering, Jiangsu University, Zhenjiang, People's Republic of China

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Yanping He

Yanping He

Institute for Advanced Materials, College of Materials Science and Engineering, Jiangsu University, Zhenjiang, People's Republic of China

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Arslan Majeed

Arslan Majeed

Institute for Advanced Materials, College of Materials Science and Engineering, Jiangsu University, Zhenjiang, People's Republic of China

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Yazhou Liang

Yazhou Liang

Institute for Advanced Materials, College of Materials Science and Engineering, Jiangsu University, Zhenjiang, People's Republic of China

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Xiangqian Shen

Xiangqian Shen

Institute for Advanced Materials, College of Materials Science and Engineering, Jiangsu University, Zhenjiang, People's Republic of China

Hunan Engineering Laboratory of Power Battery Cathode Materials, Changsha Research Institute of Mining and Metallurgy, Changsha, People's Republic of China

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Tianbao Li

Tianbao Li

Hunan Engineering Laboratory of Power Battery Cathode Materials, Changsha Research Institute of Mining and Metallurgy, Changsha, People's Republic of China

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Shibiao Qin

Shibiao Qin

Hunan Engineering Laboratory of Power Battery Cathode Materials, Changsha Research Institute of Mining and Metallurgy, Changsha, People's Republic of China

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Wei Wen

Wei Wen

College of Mechanical and Electrical Engineering, Hainan University, Haikou, People's Republic of China

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First published: 03 July 2020
Citations: 49

Funding information: China Postdoctoral Science Foundation, Grant/Award Numbers: 2017M621640, 2018T110551; National Natural Science Foundation of China, Grant/Award Numbers: 51862005, 51874146; Six Talent Peaks Project in Jiangsu Province, Grant/Award Number: XCL-125; Start-up Foundation of Jiangsu University for Senior Talents, Grant/Award Number: 15JDG014

Summary

Lithium-sulfur (Li-S) secondary batteries have been limited by the poor cyclic stability, mainly caused by the dissolution polysulfide species into the electrolyte and subsequent irreversible shuttling effect. Recently, addition of the polysulfide adsorbents within sulfur cathode is effectively improving the electrochemical performance. Herein, TiO2 integrated with g-C3N4 (TiO2@g-C3N4: TOCN) hybrid was prepared by a facile heating treatment from the precursor of urea and TiO2composites, which used as host material for elemental sulfur (TOCN@S) in Li-S batteries. The multifunctional TOCN not only reduced the electrochemical resistance but also provided strong adsorption sites to immobilize sulfur and polysulfide. As a result, the TOCN@S cathode with a sulfur content of 74.5 wt% and a sulfur loading of 3.1 mg cm−2exhibits a high initial capability of 804 mAh g−1 at 0.5°C with capacity retention of 67.2% after 500 cycles. Additionally, the composite cathode also possesses excellent high-rate performance, retaining a remarkable specific capacity of 630 mAh g−1 even at a rate of 2°C.

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