Abstract
The development of solid polymer electrolyte (SPE) systems is a promising strategy for improving the safety of lithium batteries. However, the practical implementation of these systems is often hindered by their limited ionic conductivity at ambient temperatures and poor interfacial contact with the electrodes. To address these issues, a novel pyridine-based organic ionic plastic crystal (OIPC) was synthesized and combined with poly(vinylidene fluoride-co-hexafluoropropylene) (PVH) and lithium bis(fluorosulfonyl)imide (LiFSI) to create a porous SPE, which was named SPE-Pyr1FSI/PVH (80:20). The SPE possessed desirable characteristics such as remarkable mechanical properties, nonflammability, high ionic conductivity (1.18 mS cm−1 at 25 °C), and a large electrochemical window (5.85 V vs. Li+/Li). Moreover, solid-state Li/LiFePO4 cells based on this SPE exhibited excellent rate capability, as well as cycling performance at ambient temperature. Specifically, the discharge capacity of the cells remained at 134.0 mAh g −1 at 1.0 C current density over 500 cycles. This study provides new insights into the design of ambient temperature solid-state electrolytes for lithium batteries and highlights the efficacy of OIPC in enhancing the performance of SPEs.
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Funding
The authors are indebted to the National Key Research and Development Program (No. 2019YFE0122500), the National Natural Science Foundation of China (Nos. 21878185 and 22178216), and the Natural Science Foundation of Shanghai (No. 21ZR1434800).
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Chenxi Huang: conceptualization, methodology, formal analysis, writing original draft. Zhu Liao: resources, investigation. Zhengxi Zhang: supervision. Li Yang: funding acquisition, project administration. Akihiro Orita: formal analysis.
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Huang, C., Liao, Z., Zhang, Z. et al. A novel pyridinium-based organic ionic plastic crystal for ambient temperature solid polymer electrolytes. Ionics 29, 3119–3128 (2023). https://doi.org/10.1007/s11581-023-05017-8
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DOI: https://doi.org/10.1007/s11581-023-05017-8