With the ever-increasing need for energy storage devices with high energy density, lithium (Li) metal anodes have been revisited. Due to the high reactivity of Li metal and the safety issues associated with liquid electrolytes, solid polymer electrolytes (SPEs) have gain attention. Polyethylene oxide (PEO) with the highest ionic conductivity (σ) among the polymers faces serious problems. The inability to meet the practical limit of σ due to its high crystallinity, and its low thermomechanical stability above its melting temperature, have limited its large-scale application. In this research, anionic polyurethane dispersion (PUD) based on poly (ε-caprolactone) (PCL) was synthesized and different PUD:PEO compositions was prepared using water as a solvent. Halloysite nanotube (HNT) was also used to improve the ionic conductivity by providing a new pathway for conducting lithium ions in the composition. The results corroborated that the presence of PUD stabilized the storage modulus of the host polymer above T_m of PEO. The ionic nature of the selected PUDs resulted in a transference number of 0.59 and the presence of HNT increased this value to 0.72. The presence of HNTs also led to a significant increase in σ by about three times compared to the control sample.

中文翻译：

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基于阴离子聚氨酯分散体、聚环氧乙烷、埃洛石纳米管制备高效环保固体聚合物电解质

随着对高能量密度储能设备的需求不断增加，锂（Li）金属负极被重新审视。由于锂金属的高反应活性以及与液体电解质相关的安全问题，固体聚合物电解质（SPE）引起了人们的关注。聚合物中离子电导率（ σ ）最高的聚环氧乙烷（PEO）面临着严重的问题。由于其高结晶度以及在熔化温度以上的热机械稳定性低，无法满足σ的实际极限，限制了其大规模应用。在本研究中，合成了基于聚(ε-己内酯)(PCL)的阴离子聚氨酯分散体(PUD)，并使用水作为溶剂制备了不同的PUD:PEO组合物。埃洛石纳米管（HNT）还用于通过提供在组合物中传导锂离子的新途径来提高离子电导率。结果证实，PUD 的存在使主体聚合物的储能模量稳定在PEO 的T _m以上。所选 PUD 的离子性质导致转移数为 0.59，HNT 的存在使该值增加至 0.72。与对照样品相比，HNT 的存在还导致σ显着增加约三倍。