期刊
NANO ENERGY
卷 57, 期 -, 页码 625-634出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.12.086
关键词
Zn anodes; Deep eutectic solvents; Low cost batteries; Aqueous electrolytes; Water molecules
类别
资金
- Programs of the National Natural Science Foundation of China [21601195, 51625204, 21671196]
- Qingdao Science and Technology Program [17-1-1-30-jch]
- Key Scientific and Technological Innovation Project of Shandong [2017CXZC0505]
- Qingdao Key Lab of Solar Energy Utilization & Energy Storage Technology
- China National Funds for Distinguished Young Scientists of the National Natural Science Foundation of China
Metallic zinc (Zn) is one of the most promising anodes for aqueous batteries, but so far its applicability for rechargeable systems remains elusive, mainly owing to the free water-induced parasitic reactions. Here, we report a new water-in-deep eutectic solvent (water-in-DES) electrolyte (similar to 30 mol.% H2O in a eutectic mixture of urea/LiTFSI/Zn(TFSI)(2); TFSI, bis(trifluoromethanesulfonyl) imide), in which all water molecules participate in DES's internal interaction (H-bonding and coordinating) network, leading to a suppressed reactivity with Zn anode from both thermodynamic and electrochemical aspects. Inheriting characteristics from aqueous and DES media, this electrolyte enables stable and reversible Zn plating/stripping with over twentyfold enhancement in cycling life compared to routine aqueous electrolytes, even at low rates. With these merits, a desirable rechargeability (> 90% capacity retention after 300 cycles at 0.1 C) is achieved for a 1.92 V (average dicharge voltage) Zn/LiMn2O4 battery, together with a practical energy density of 52 Wh/kg (pouch cell, 2 Ah, similar to 9.8 x excess Zn on anode).
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