Journal
ENERGY STORAGE MATERIALS
Volume 45, Issue -, Pages 903-910Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.12.045
Keywords
Aqueous lithium-ion batteries; Water/1,3-dioxolane hybrid electrolytes; Wide electrochemical stability window; High ionic conductivity
Funding
- National Natural Science Foundation of China [21573080]
- Guangdong Program for Support of Dis-tinguished Young Scholar [2017B030306013]
- Army Research Lab [W911NF-12-2-0023]
- Joint Center for Energy Storage Research (JCESR) , an energy hub - Department of Energy Basic Energy Science [W911NF-19-2-0046]
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A non-flammable hybrid electrolyte with a wide electrochemical stability window of 4.7 V and supporting fast ion transport at temperatures as low as -50 degrees C has been proposed, demonstrating high Coulombic efficiency in lithium-ion batteries at room temperature and remaining operational under extreme low temperatures.
Despite strong interest in replacing the flammable non-aqueous electrolytes with an aqueous alternative, the state-of-the-art aqueous electrolytes face challenges in achieving wide electrochemical stability window (ESW) and simultaneously maintaining fast ion-transport at sub-zero temperatures. Here, we proposed a non-flammable hybrid electrolyte consisting of water and 1,3-dioxolane (DOL) with an ESW of 4.7 V that supports fast ion-transport at temperatures as low as -50 degrees C. DOL-presence reduces the population of free water at anode/electrolyte interface, promoting the formation of a compact LiF-rich interphase, while its weak coordination with Li+ enables fast Li+-desolvation process at low temperatures. LiMn2 O-4/Li4Ti5O12 lithium-ion batteries containing developed electrolyte demonstrated high Coulombic efficiency (99.8%) for thousands of cycles at room temperature, and remain operational at -50 degrees C, far outperforming the counterparts using non-aqueous or aqueous electrolytes.
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