期刊
ACS APPLIED MATERIALS & INTERFACES
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c04893
关键词
hydrated eutectics; water-locked effects; weak hydrogen bonds; aqueous sodium-ion batteries; high energy density
资金
- National Natural Science Foundation of China [21975271, 52073298]
- Major basic research projects of Shandong Natural Science Foundation [ZR2020ZD07]
- Youth Innovation Promotion Association of CAS [2019214, 2020217]
- Shandong Energy Institute [SEI I202127]
This study presents a hydrated eutectic electrolyte with a water-locked effect, which strengthens the O-H bond of water via weak hydrogen bonding, leading to improved rechargeability and stability of aqueous sodium batteries.
Aqueous sodium batteries are one of the awaited technologies for large-scale energy storage, but remain poorly rechargeable because of the reactivity issues of water. Here, we present a hydrated eutectic electrolyte featuring a water-locked effect, which is exceptional in that the O-H bond of water is essentially strengthened via weak hydrogen bonding (relative to the original H2O-H2O hydrogen bonds) to low-donor-number anions and ligands. Even without interphase protection, both the anodic and cathodic water electrodecomposition reactions are delayed, extending the aqueous potential window to 3.4 V. Combined with the alleviated electrode dissolution, Na2MnFe(CN)6||NaTi2(PO4)(3) batteries deliver a high energy density of similar to 80 W h k(g-1) at 0.5 C and undergo over 1000 cycles with a 74.5% capacity retention and a 99.4% Coulombic efficiency at 4.2 C. This work may offer a general guide to ultimately exploit the water's innate stability for realizing the promise of aqueous battery technologies.
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