期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202305466
关键词
1; 3; 5-Trioxane; Lithium-Sulfur Batteries; Mechanical Stability; Pouch Cells; Solid Electrolyte Interphase
This study proposes an electrolyte with co-solvents 1,3,5-trioxane (TO) and 1,2-dimethoxyethane (DME) to construct a high-mechanical-stability solid electrolyte interphase (SEI) in Li-S batteries. The high-mechanical-stability SEI works compatibly in Li-S batteries, which reduces the consumption rate of Li, Li polysulfides, and electrolytes. The lifespan of Li-S batteries increases from 75 cycles to 216 cycles in TO-based electrolyte, and a 417 Wh kg(-1) Li-S pouch cell undergoes 20 cycles. This work provides an emerging electrolyte design for practical Li-S batteries.
Practical lithium-sulfur (Li-S) batteries are severely plagued by the instability of solid electrolyte interphase (SEI) formed in routine ether electrolytes. Herein, an electrolyte with 1,3,5-trioxane (TO) and 1,2-dimethoxyethane (DME) as co-solvents is proposed to construct a high-mechanical-stability SEI by enriching organic components in Li-S batteries. The high-mechanical-stability SEI works compatibly in Li-S batteries. TO with high polymerization capability can preferentially decompose and form organic-rich SEI, strengthening mechanical stability of SEI, which mitigates crack and regeneration of SEI and reduces the consumption rate of active Li, Li polysulfides, and electrolytes. Meanwhile, DME ensures high specific capacity of S cathodes. Accordingly, the lifespan of Li-S batteries increases from 75 cycles in routine ether electrolyte to 216 cycles in TO-based electrolyte. Furthermore, a 417 Wh kg(-1) Li-S pouch cell undergoes 20 cycles. This work provides an emerging electrolyte design for practical Li-S batteries.
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