Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 47, Pages 16994-16999Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201908913
Keywords
-50 degrees C; aqueous batteries; dimethyl sulfoxide; hydrogen bonds; low temperature
Categories
Funding
- National Key R&D Program of China [2016YFB0901500, 2017YFA0206702]
- National Natural Science Foundation of China [51771094, 21835004, 21773226]
- Ministry of Education of China [B12015, IRT13R30]
- Tianjin High-Tech [18JCZDJC31500]
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Insufficient ionic conductivity and freezing of the electrolyte are considered the main problems for electrochemical energy storage at low temperatures (low T). Here, an electrolyte with a freezing point lower than -130 degrees C is developed by using dimethyl sulfoxide (DMSO) as an additive with molar fraction of 0.3 to an aqueous solution of 2 m NaClO4 (2M-0.3 electrolyte). The 2M-0.3 electrolyte exhibits sufficient ionic conductivity of 0.11 mS cm(-1) at -50 degrees C. The combination of spectroscopic investigations and molecular dynamics (MD) simulations reveal that hydrogen bonds are stably formed between DMSO and water molecules, facilitating the operation of the electrolyte at ultra-low T. Using DMSO as the electrolyte additive, the aqueous rechargeable alkali-ion batteries (AABs) can work well even at -50 degrees C. This work provides a simple and effective strategy to develop low T AABs.
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