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首页> 外文期刊>Polymers for advanced technologies >Phase behavior and Li+ Ion conductivity of styrene-ethylene oxide multiblock copolymer electrolytes
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Phase behavior and Li+ Ion conductivity of styrene-ethylene oxide multiblock copolymer electrolytes

机译：苯乙烯-环氧乙烷多嵌段共聚物电解质的相行为和Li +离子电导率

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Solid polymer electrolytes are attractive materials for use as battery separators. Here, a molecular weight series of polystyrene-polyethylene oxide (PEO) multiblock copolymers was synthesized by the thiol-norbornene click reaction. The subsequent materials were characterized both neat and with a lithium bis-(trifluoromethane)sulfonimide salt loading [(Li)/(EO)] of 0.1. In general, neat samples demonstrated crystallinity scaling with PEO content. Lithium ion-containing samples had broad scattering peaks, half of which displayed disordered scattering, even at the lowest block molecular weights (polystyrene=1kg/mol, PEO=1kg/mol). Fitting of disordered scattering data, using the random phase approximation, yielded (RPA) and R-g values that were compared with recent predictive work by Balsara and coworkers. The predictions were accurate near the volume fraction f(PEO)=0.5 but deviated symmetrically with volume fraction asymmetry. Samples were also analyzed by electrochemical impedance spectroscopy for their potential to conduct lithium ions. Samples with f(PEO)0.5 demonstrated robust conductivity, whereas samples below this volume fraction conducted very poorly, with one exception (f(PEO)=0.24). This work expanded upon our recently reported approach to multiblock copolymer synthesis, demonstrating the improved access of materials to further our fundamental understanding of multiblock copolymers. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：固体聚合物电解质是用作电池隔板的有吸引力的材料。在此，通过硫醇-降冰片烯点击反应合成了分子量系列的聚苯乙烯-聚环氧乙烷（PEO）多嵌段共聚物。随后的材料的特征在于纯的和双-（三氟甲烷）磺酰亚胺锂盐载量[（Li）/（EO）]为0.1。通常，纯净的样品表现出结晶度随PEO含量的变化。含锂离子的样品具有宽的散射峰，即使在最低的嵌段分子量（聚苯乙烯= 1kg / mol，PEO = 1kg / mol）下，也有一半显示无序散射。使用随机相位近似拟合无序散射数据，得出（RPA）和R-g值，这些值与Balsara及其同事最近的预测工作进行了比较。预测在体积分数f（PEO）= 0.5附近是准确的，但随着体积分数不对称而对称地偏离。还通过电化学阻抗谱分析了样品传导锂离子的潜力。 f（PEO）0.5的样品表现出强的电导率，而低于该体积分数的样品则表现非常差，只有一个例外（f（PEO）= 0.24）。这项工作是在我们最近报道的多嵌段共聚物合成方法的基础上扩展的，这表明材料的获取途径得到了改善，从而进一步加深了我们对多嵌段共聚物的基本了解。版权所有（c）2016 John Wiley＆Sons，Ltd.

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