We study the phase behavior of a triblock organic–inorganic hybrid copolymer, poly(polyhedral oligomeric silsesquioxane)-b-poly(ethylene oxide)-b-poly(polyhedral oligomeric silsesquioxane) (POSS-PEO-POSS)/lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt mixture, as a function of temperature. The polymer exhibits a lamellar morphology both in the neat state and in the presence of salt. However, the average grain size increases substantially when the electrolyte is heated above 113 °C. The grain structure of this sample changes reversibly with temperature, that is, smaller grains reappear when the electrolyte is cooled below 113 °C. While annealing block copolymers at high temperatures often leads to an increase in the grain size, this change is generally irreversible. The reason for the reversible change in the grain structure of the POSS-PEO-POSS/LiTFSI electrolyte is discussed. The ionic conductivity of the electrolyte also exhibits reversible changes in this temperature window. Knowledge of the grain structure is crucial for understanding ion transport in nanostructured electrolytes.

中文翻译：

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嵌段共聚物电解质中晶粒结构和电导率的可逆变化

我们研究的三嵌段的有机-无机杂化共聚物，聚的相位行为（多面体低聚倍半硅氧烷） - b -聚（环氧乙烷） - b-聚（多面体低聚倍半硅氧烷）（POSS-PEO-POSS）/双（三氟甲磺酰基）酰亚胺锂（LiTFSI）盐混合物，随温度变化。该聚合物在纯态和盐存在下均表现出层状形态。然而，当将电解质加热到113℃以上时，平均晶粒尺寸显着增加。该样品的晶粒结构随温度可逆变化，也就是说，当电解质冷却到113°C以下时，会出现较小的晶粒。尽管在高温下对嵌段共聚物进行退火通常会导致晶粒尺寸增加，但是这种变化通常是不可逆的。讨论了POSS-PEO-POSS / LiTFSI电解质晶粒结构可逆变化的原因。在此温度范围内，电解质的离子电导率也表现出可逆的变化。