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Lithiated Nafion plasticised by a mixture of ethylene carbonate and sulfolane
Electrochimica Acta ( IF 5.5 ) Pub Date : 2021-02-08 , DOI: 10.1016/j.electacta.2021.137914
Evgeny A. Sanginov , Sophia S. Borisevich , Ruslan R. Kayumov , Aigul S. Istomina , Elizaveta Yu. Evshchik , Olga G. Reznitskikh , Tatyana V. Yaroslavtseva , Tatiana I. Melnikova , Yury A. Dobrovolsky , Olga V. Bushkova

A Nafion-115 membrane in its lithiated form (Li-Nafion) was plasticised using a binary mixture of ethylene carbonate (EC) and sulfolane (SL) to obtain a polymer electrolyte with single-ion lithium conductivity and enhanced stability. The weight fraction of SL in the binary mixture varied from pure EC to pure SL with a step of 5-10 wt. %. Quantum chemical calculations at the M05-2X/TZVP + SMD theory level predicted that an EC/SL binary mixture can be a more effective plasticiser for the Li-Nafion membrane than its single components. A significant influence of mixing temperature (at which the membranes were saturated with a plasticiser) on the swelling degree of the membranes was observed; when the temperature was below the melting point of pure EC, membrane saturation was substantially less effective despite the liquid state of the binary plasticiser EC/SL. The temperature dependences of ionic conductivity of the electrolytes obey the Arrhenius law with activation energies 21 to 33 kJ mol−1. The best sample demonstrated single-ion lithium conductivity of 6.3 × 10−6 to 6.9 × 10−4 S cm−1 within the temperature range of -40 to +80 °C and a negligible contribution of electronic conductivity (~10−9 S cm−1 at 25 °C) together with electrochemical stability window 0 to 6 V vs. Li/Li+. Electrochemical properties of Li-Nafion swollen with the non-volatile EC/SL binary plasticiser appear to be suitable for practical applications in lithium batteries.



中文翻译:

碳酸亚乙酯和环丁砜的混合物塑化的锂化Nafion

使用碳酸亚乙酯(EC)和环丁砜(SL)的二元混合物将锂化形式的Nafion-115膜(Li-Nafion)塑化,以获得具有单离子锂电导率和增强的稳定性的聚合物电解质。二元混合物中SL的重量分数从纯EC变为纯SL,步长为5-10 wt%。%。在M05-2X / TZVP + SMD理论水平上进行的量子化学计算预测,EC / SL二元混合物比Li-Nafion膜更有效的增塑剂。观察到混合温度(膜被增塑剂饱和)对膜溶胀度的显着影响。当温度低于纯EC的熔点时 尽管二元增塑剂EC / SL处于液态,但膜饱和的效果实际上不太好。电解质的离子电导率的温度依赖性遵循阿伦尼乌斯定律,其活化能为21至33 kJ mol-1。最佳样品的单离子锂电导率在-40至+80°C的温度范围内为6.3×10 -6至6.9×10 -4 S cm -1,并且电子电导率的贡献可忽略不计(〜10 -9 S相对于Li / Li +的0至6 V电化学稳定性窗口,在25°C下为-1 cm -1)。用非易失性EC / SL二元增塑剂溶胀的Li-Nafion的电化学性能似乎适合锂电池的实际应用。

更新日期:2021-02-15
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