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Quasi-solid-state polymer plastic crystal electrolyte for subzero lithium-ion batteries
Journal of Energy Chemistry ( IF 13.1 ) Pub Date : 2019-11-09 , DOI: 10.1016/j.jechem.2019.11.001
Yumei Zhou , Fengrui Zhang , Peixin He , Yuhong Zhang , Yiyang Sun , Jingjing Xu , Jianchen Hu , Haiyang Zhang , Xiaodong Wu

Succinonitrile (SN)-based polymer plastic crystal electrolytes (PPCEs) have attracted considerable attention as solid-state electrolytes owing to their high ionic conductivities similar to those of liquid electrolytes, excellent contacts with the electrodes, and good mechanic properties. As a crucial property of a solid-state electrolyte, the ionic conductivity of the PPCE directly depends on the interactions between the constituent parts including the polymer, lithium salt, and SN. A few studies have focused on the effects of polymer–lithium–salt and polymer–SN interactions on the PPCE ionic conductivity. Nevertheless, the impact of the lithium–salt–SN combination on the PPCE ionic conductivity has not been analyzed. In particular, tuning of the lithium-salt–SN interaction to fabricate a subzero PPCE with a high low-temperature ionic conductivity has not been reported. In this study, we design and fabricate five PPCE membranes with different weight ratios of LiN(SO2CF3)2 (LiTFSI) and SN to investigate the effect of the LiTFSI–SN interaction on the PPCE ionic conductivity. The ionic conductivities of the five PPCEs are investigated in the temperature range of –20 to 60 °C by electro-chemical impedance spectroscopy. The interaction is analyzed by Fourier-transform infrared spectroscopy, Raman spectroscopy, and differential scanning calorimetry. The LiTFSI–SN interaction significantly influences the melting point of the PPCE, dissociation of the LiTFSI salt, and thus the PPCE ionic conductivity. By tuning the LiTFSI–SN interaction, a subzero workable PPCE membrane having an excellent low-temperature ionic conductivity (6 × 10−4 S cm–1 at 0 °C) is obtained. The electro-chemical performance of the optimal PPCE is evaluated by using a LiCoO2/PPCE/Li4Ti5O12 cell, which confirms the application feasibility of the proposed quasi-solid-state electrolyte in subzero workable lithium-ion batteries.



中文翻译:

用于零以下锂离子电池的准固态聚合物塑料晶体电解质

基于丁二腈(SN)的聚合物塑料晶体电解质(PPCE)作为固态电解质已引起了相当大的关注,这是由于它们的离子导电性与液体电解质相似,与电极的接触性极佳,并且具有良好的机械性能。作为固态电解质的关键特性,PPCE的离子电导率直接取决于包括聚合物,锂盐和SN在内的组成部分之间的相互作用。一些研究集中在聚合物-锂-盐和聚合物-SN相互作用对PPCE离子电导率的影响上。然而,尚未分析锂-盐-SN组合对PPCE离子电导率的影响。特别是,还没有报道过调节锂盐-SN相互作用以制备具有高低温离子电导率的低于零的PPCE。在这项研究中,我们设计和制造了五种不同重量比的LiN(SO2 CF 32(LiTFSI)和SN,以研究LiTFSI-SN相互作用对PPCE离子电导率的影响。通过电化学阻抗谱在–20至60°C的温度范围内研究了五个PPCE的离子电导率。通过傅立叶变换红外光谱,拉曼光谱和差示扫描量热法分析相互作用。LiTFSI-SN的相互作用会显着影响PPCE的熔点,LiTFSI盐的离解,进而影响PPCE的离子电导率。通过调节LiTFSI-SN相互作用,可在零以下工作的PPCE膜具有出色的低温离子电导率(6×10 -4  S cm –1在0°C下)。通过使用LiCoO 2 / PPCE / Li 4 Ti 5 O 12电池评估了最佳PPCE的电化学性能,这证实了拟固体电解质在零度以下可工作锂离子电池中的应用可行性。

更新日期:2019-11-09
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