@article{Li2025, 
author = {Chuanyang Li and Wenjun Luo and Wenxian Xue and Zhengchunyu Zhang and Baojuan Xi and Jiajie Gu and Li Zhang and Zhou Yang and Hailang Jia and Wutao Mao and Keyan Bao and Shenglin Xiong},
title = {Flame-retardant “water in oil” electrolyte enables Ah-level aqueous lithium-ion batteries},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {8},
pages = {94907479},
keywords = {aqueous battery, electrochemical stability window, electrolyte, solvated structure},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907479},
doi = {10.26599/NR.2025.94907479},
abstract = {Aqueous batteries are appealing for their safety and environmental benefits, but their use is restricted by the limited electrochemical stability window due to water decomposition. Suppressing water splitting and expanding the electrochemical operating window of electrolytes remain a huge challenge. In this work, a series of “water in oil” electrolytes based on dimethyl methylphosphate (DMMP) have been designed. Experimental and theoretical data show that DMMP has strong supramolecular interactions with H2O, which can break the original interactions between H2O molecules and form more stable hydrogen bonds. At the same time, it chelates Li+ to regulate solvation structure and enable rapid Li+ transport. Additionally, DMMP contributes to cathode electrolyte interphase (CEI) film formation on the cathode, stabilizing its crystal structure during cycling. This new design not only expands the electrochemical stability window (3.1 V), but also supports LiMn2O4||NaTi2(PO4)3 cell to cycle more than 1000 times and LiFePO4|| NaTi2(PO4)3 cell to cycle more than 2000 times. 7 Ah LiMn2O4||NaTi2(PO4)3 pouch cell delivers a high energy density of 49.3 Wh·kg−1 and high Coulombic efficiency of 99.8% at 4 A·g−1 over 500 cycles. This work provides new insights into the design of electrolytes based on the organic co-solvent for rechargeable batteries.}
}