期刊
CHEM
卷 6, 期 12, 页码 3297-3311出版社
CELL PRESS
DOI: 10.1016/j.chempr.2020.09.015
关键词
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资金
- Beijing Natural Science Foundation [JQ20004]
- National Key Research and Development Program [2016YFA0202500]
- National Natural Science Foundation of China [21776019, 21808124]
Lithium-sulfur (Li-S) battery affords an ultrahigh theoretical energy density of 2,600 Wh kg(-1) as a promising next-generation energy storage technique, whose actual performance is heavily dependent on the sulfur redox kinetics. Lithium polysulfide intermediates play a decisive role on the complex sulfur redox reactions but are unfortunately insufficient to afford rapid kinetics, rendering reduced specific capacity especially at high rates. Herein, a redox comediation strategy is proposed and an organopolysulfide (di-t-butyl disulfide, DtbDS) is introduced as a model comediator to accelerate the sulfur redox kinetics. Concretely, DtbDS reacts with lithium polysulfides and provides a kinetically favorable pathway for polysulfide conversion. Consequently, high-rate (4 C), high-sulfur-loading (5 mg cm(-2)), or lean-electrolyte (5.0 mu L mgs(-1)) Li-S batteries are realized. The redox comediation strategy demonstrates a novel approach to promote the sulfur redox kinetics for high-performance Li-S batteries and inspires more redox comediators represented by DtbDS.
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