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7748442 
Journal Article 
Methylsulfonylmethane-Based Deep Eutectic Solvent as a New Type of Green Electrolyte for a High-Energy-Density Aqueous Lithium-Ion Battery 
Jiang, P; Chen, L; Shao, H; Huang, S; Wang, Q; Su, Y; Yan, X; Liang, X; Zhang, J; Feng, J; Liu, Z 
2019 
American Chemical Society 
WASHINGTON 
4 
6 
1419-1426 
English 
WOS:000472121800028 
Currently used aqueous electrolytes for lithium-ion batteries suffer from narrow potential windows of <1.5 V. In this paper, we are the first to discover the new deep eutectic solvent (DES) electrolyte of the methylsulfonylmethane-lithium perchlorate-water system, which is a safe, environmentally friendly, and low-cost "water-in-salt" aqueous electrolyte. It is found that the lithium ion can coordinate with the oxygen atom in the Sâ•O double bond, perchlorate, and water molecule, retaining fluidity at room temperature when the molar ratios of MSM:LiClO4:H2O are 1.8:1:z (z > 0.3). This DES electrolyte performs with a satisfying electrochemical stability window (a3.5 V), which enables the LiMn2O4/Li4Ti5O12 aqueous lithium-ion battery with both high energy density (>160 W h kg-1) and high capacity retention (72.2% after 1000 cycles). Overall, our study of this new deep DES electrolyte can enrich room-temperature "water-in-salt" aqueous electrolyte and offers new insights into exploring green aqueous electrolyte systems for lithium-ion batteries. © 2019 American Chemical Society.