期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 906, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164249
关键词
Lithium-sulfur batteries; Shuttle effect; TiO2@SCNT separator; Polysulfides
资金
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Natural Science Foundation of Suqian [K202130]
A functional separator composed of TiO2@surface-modified carbon nanotubes composite on polypropylene (PP) separator is developed to effectively block the shuttle effect of polysulfides in lithium-sulfur batteries. The as-assembled Li-S batteries using this functional separator exhibit considerably enhanced reversible capacity, cycling performance, and reaction kinetics.
The severe shuttle effect of polysulfides in lithium-sulfur (Li-S) batteries leads to rapid performance deterioration. Herein, a functional separator composed of TiO2@surface-modified carbon nanotubes composite on polypropylene (PP) separator (donated as TiO2@SCNT/PP) is developed toward the effective blocking of polysulfide shuttle. The as-assembled Li-S batteries using this functional separator with the strongly polar TiO2 and highly conductive CNTs demonstrated considerably enhanced reversible capacity, cycling performance and reaction kinetics. The corresponding simple sulfur cathode with 70 wt% elemental sulfur powders exhibits a high initial discharge capacity of 1103.9 mAh g(-1), a high capacity of 848.0 mAh g(-1) after 200 cycles at 0.5 C, and a capacity decay of only 0.066% per cycle over 900 cycles. Moreover, a high reversible capacity of 746.5 mAh g(-1) is maintained after 300 cycles at 1 C. In contrast, the low reversible capacity of 218.5 mAh g(-1) at 0.5 C is obtained without the use of the TiO2@SCNT/PP. (C) 2022 Published by Elsevier B.V.
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