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Surface Reconstruction Limited Conductivity in Block-Copolymer Li Battery Electrolytes

机译：嵌段共聚物锂电池电解质的表面重构有限电导率

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Solid polymer electrolytes for lithium batteries promise improvements in safety and energy density if their conductivity can be increased. Nanostructured block-copolymer electrolytes specifically have the potential to provide both good ionic conductivity and good mechanical properties. This study shows that the previously neglected nanoscale composition of the polymer electrolyte close to the electrode surface has an important effect on impedance measurements, despite its negligible extent compared to the bulk electrolyte. Using standard stainless steel blocking electrodes, the impedance of lithium salt-doped poly(isoprene-b-styrene-b-ethylene oxide) (ISO) exhibits a marked decrease upon thermal processing of the electrolyte. In contrast, covering the electrode surface with a low molecular weight poly(ethylene oxide) (PEO) brush results in higher and more reproducible conductivity values, which are insensitive to the thermal history of the device. A qualitative model of this effect is based on the hypothesis that ISO surface reconstruction at the different electrode surfaces leads to a change in the electrostatic double layer, affecting electrochemical impedance spectroscopy measurements. As a main result, PEO-brush modification of electrode surfaces is beneficial for the robust electrolyte performance of PEO-containing block-copolymers and may be crucial for their accurate characterization and use in Li-ion batteries.
机译：如果可以提高其导电性，则锂电池用固体聚合物电解质有望改善安全性和能量密度。纳米结构的嵌段共聚物电解质特别具有提供良好的离子传导性和良好的机械性能的潜力。这项研究表明，尽管与本体电解质相比其程度可忽略不计，但先前被忽略的接近电极表面的聚合物电解质纳米级成分对阻抗测量有重要影响。使用标准的不锈钢阻挡电极，掺杂锂盐的聚（异戊二烯-b-苯乙烯-b-环氧乙烷）（ISO）的阻抗在电解质热处理时会显着降低。相反，用低分子量聚环氧乙烷（PEO）刷覆盖电极表面会导致更高和可重现的电导率值，这对设备的热历史不敏感。这种影响的定性模型基于以下假设：不同电极表面的ISO表面重建会导致静电双层的变化，从而影响电化学阻抗谱的测量。作为主要结果，电极表面的PEO刷修饰对于含PEO的嵌段共聚物的稳健的电解质性能是有益的，并且可能对其在锂离子电池中的准确表征和使用至关重要。

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