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首页> 外文期刊>RSC Advances >Factors influencing fast ion transport in glyme-based electrolytes for rechargeable lithium–air batteries
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Factors influencing fast ion transport in glyme-based electrolytes for rechargeable lithium–air batteries

机译：影响可充电锂空气电池的基于乙二醇的电解质中离子快速迁移的因素

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To elucidate the determination factors affecting Li-ion transport in glyme-based electrolytes, six kinds of 1.0 M tetraglyme (G4) electrolytes were prepared containing a Li salt (LiSO3CF3, LiN(SO2CF3)2, or LiN(SO2F)2) or different concentrations (0.5, 2.0, or 2.7 M) of LiN(SO2CF3)2. In addition to conventional bulk parameters such as ionic conductivity (σ), viscosity (η), and density, self-diffusion coefficients of Li+, anions, and G4 were measured by pulsed-gradient spin-echo nuclear magnetic resonance method. Interaction energies (ΔE) were determined by density functional theory calculations based on the supermolecule method for Li+–anion (salt dissociation) and G4–Li+ (Li+ solvation) interactions. The ΔE values corresponded to ion diffusion radii formed by solvation and/or ion pairs. The order of dissociation energies ΔE was LiSO3CF3 > LiN(SO2CF3)2 > LiN(SO2F)2, which agreed well with the dissociation degree of these salts in the electrolytes. From the obtained knowledge, we also demonstrated that increasing the mobility and number of carrier ions are effective ways to enhance σ of glyme-based electrolytes by using 1,2-dimethoxyethane with lower η and similar dielectric constant to those of G4.
机译：为了阐明影响锂离子在基于甘醇二甲醚的电解质中迁移的决定因素，制备了六种含锂盐的1.0 M四甘醇二甲醚（G4）电解质（LiSO 3 CF 3 ，LiN（SO 2 CF 3 ） 2 或LiN（SO 2 F） 2 < / small>）或不同浓度（0.5、2.0或2.7 M）的LiN（SO 2 CF 3 ） 2 。除了常规的体积参数，例如离子电导率（σ），粘度（η）以及Li + <通过脉冲梯度自旋回波核磁共振法测定/ sup>，，阴离子和G4。基于超分子法的Li + -阴离子（盐离解）和G4的超分子方法，通过密度泛函理论计算确定了相互作用能（Δ E ） –Li + （Li + 溶剂化）相互作用。 Δ E 值对应于由溶剂化和/或离子对形成的离子扩散半径。解离能Δ E 的顺序为LiSO 3 CF 3 SO 2 CF 3 ） 2 2 F） 2 ，与这些盐在电解质中的解离度非常吻合。从所获得的知识中，我们还证明了通过使用具有较低ησ的有效方法。 em>和与G4相似的介电常数。

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