Life Aging Effect as a Conditioning Process that Regulates the Performance of the Halogen-Free Mg Electrolyte.
Life Aging Effect as a Conditioning Process that Regulates the Performance of the Halogen-Free Mg Electrolyte.
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DOI：
10.1021/acs.langmuir.3c02690
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发表时间：
2023-11
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影响因子：
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通讯作者：
E. Sheha;Shengqi Fan;Mohamed Farrag;Engy El-Dek;Mostafa A Moselhy;Dora Sulatt;Niya Sa
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文献类型：
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作者：
E. Sheha;Shengqi Fan;Mohamed Farrag;Engy El-Dek;Mostafa A Moselhy;Dora Sulatt;Niya Sa
研究电化学性能和电解液调节过程之间的相互作用对于构建高效镁电池至关重要。在这项工作中，我们使用无卤电解质（HFE）基于Mg（NO3）2在乙腈（ACN）和四甘醇二甲醚（G4），以研究其电化学性能的老化时间日历的影响。表征技术证实了相对于所制备的新鲜HFE，老化HFE的本体形态和Mg 2+溶剂化屏障发生明显变化。相对于所制备的新鲜HFE，老化HFE的Mg电镀/剥离的过电位和体电阻降低。相对于具有新鲜HFE的Mg-S电池，使用老化HFE的Mg-S电池提供高比容量（586 mA h/g）、更高的库仑效率和更高的循环寿命（在25 °C下高达30个循环），新鲜HFE在0.02 mA cm-2的电流密度下提供约535 mA h g-1的比容量、低库仑效率和短循环寿命。本研究结果提供了一个新的概念，描述了老化过程如何调节HFE的电化学性能，提高Mg-S电池的循环寿命。
Studying the interplay between the electrochemical performance and the electrolyte conditioning process is crucial for building an efficient magnesium battery. In this work, we use halogen-free electrolyte (HFE) based on Mg(NO3)2 in acetonitrile (ACN) and tetraethylene glycol dimethyl ether (G4) to study the effect of the aging time calendar on its electrochemical properties. The characterization techniques confirm apparent changes occurring in the bulk speciation and the Mg2+ solvation barrier of the aging HFE relative to the as-prepared fresh HFE. The overpotential of Mg plating/stripping and bulk resistance of the aging HFE is reduced relative to the as-prepared fresh HFE. Mg-S cells using aged HFE deliver high specific capacities (586 mA h/g), higher Coulombic efficiencies, and higher cycle life (up to 30 cycles at 25 °C) relative to Mg-S cells with fresh HFE that deliver a specific capacity of ∼535 mA h g-1, low Coulombic efficiency, and short cycle life at a current density of 0.02 mA cm-2. The present findings provide a new concept describing how the aging process regulates the electrochemical performance of the HFE and enhances the cycle life of Mg-S batteries.