法拉第效率
电化学窗口
水溶液
易燃液体
锂(药物)
电池(电)
材料科学
离子
无机化学
电解质
电化学
阳极
化学工程
离子电导率
电极
化学
热力学
有机化学
物理化学
功率(物理)
内分泌学
工程类
物理
医学
作者
Zekai Ma,Jiawei Chen,Jenel Vatamanu,Oleg Borodin,Dmitry Bedrov,Xianggui Zhou,Wenguang Zhang,Weishan Li,Kang Xu,Lidan Xing
标识
DOI:10.1016/j.ensm.2021.12.045
摘要
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 °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. LiMn2O4/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 °C, far outperforming the counterparts using non-aqueous or aqueous electrolytes.
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