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- W3021352686 abstract "Metallic tin (Sn) has always been considered as an anode candidate for nonaqueous lithium-ion batteries (LIBs). Nevertheless, there were hardly any attempts to use Sn as an anode material in aqueous batteries. Although Sn possesses relatively high specific capacity (451.54 mAh/g, two-electron transfer reaction), mild electrode potential (−0.1375 V vs the standard hydrogen electrode, Sn2+ + 2e– = Sn), high hydrogen overpotential, and environmental friendliness, it also suffers from bad reversibility and low Coulombic efficiency (CE) in common aqueous electrolytes. In this work, a dendrite-free Sn anode with highly improved reversibility in an aqueous electrolyte was realized using a type of “water-in-salt” electrolyte (1 m Sn(OTf)2 + 20 m LiTFSI). The results of Fourier transform infrared (FTIR) spectra and density functional theory (DFT) calculations have verified the significant impact of highly concentrated LiTFSI salt on Sn2+ hydrolysis, which is the key factor in improving the reversibility of the Sn anode and suppressing the dendrite formation. A Sn/LiFePO4 cell applying this electrolyte was acquired with a discharge plateau at around 0.6 V. In the cyclability test, the Sn anode exhibited a stable discharge capacity of more than 107 mAh/g with a Coulombic efficiency (CE) of 95% for 35 cycles (0.2C rate)." @default.
- W3021352686 created "2020-05-13" @default.
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- W3021352686 date "2020-04-29" @default.
- W3021352686 modified "2023-10-18" @default.
- W3021352686 title "Dendrite-Free Sn Anode with High Reversibility for Aqueous Batteries Enabled by “Water-in-Salt” Electrolyte" @default.
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- W3021352686 doi "https://doi.org/10.1021/acsaem.0c00557" @default.
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