Ionic liquid-modified poly(propylene carbonate)-based electrolyte for all-solid-state lithium battery
Ionic liquid-modified poly(propylene carbonate)-based electrolyte for all-solid-state lithium battery
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DOI：
10.1007/s11581-020-03720-4
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发表时间：
2020-08
期刊：
影响因子：
2.8
通讯作者：
Changjiang Zhao;F. Ding;Huan Li;Shuoqing Zhang;Xingjiang Liu;Qiang Xu
中科院分区：
文献类型：
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作者：
Changjiang Zhao;F. Ding;Huan Li;Shuoqing Zhang;Xingjiang Liu;Qiang Xu
全固态锂电池由于其高安全性和优异的热稳定性，近年来得到了广泛的探索，未来储能需求旺盛。在此，我们提出了一种新型全固态电解质，它是通过用聚碳酸亚丙酯（PPC）基聚合物电解质对离子液体进行改性而制备的。所选离子液体 1-乙烯基咪唑双（三氟甲磺酰基）亚胺 (VIm-TFSI) 作为增塑剂融入 PPC 基质中。这种VIm-TFSI改性的PPC基电解质（PPC-25IL）在室温下的离子电导率为8.2 × 10−5S cm−1。此外，它能够实现锂阳极高度可逆的镀锂/脱锂，从而显着提高LiFePO4-Li全固态电池的倍率和循环性能。 VIm-TFSI增塑剂不仅提高了PPC基电解液的离子电导率，而且提高了PPC基电解液与电极的界面可比性。这项工作提出了一种开发实际应用的全固态锂电池的新策略。
Due to their high safety and excellent thermal stability, all-solid-state lithium batteries have been explored widely in the recent years, which are highly in demand for future energy storage. Herein, we propose a novel type of all-solid-state electrolyte, which is prepared by the modification of ionic liquid with poly(propylene carbonate) (PPC)-based polymer electrolyte. The selected ionic liquid, 1-vinylimidazole bis(trifluoromethanesulfonyl)imide (VIm-TFSI), acts as a plasticizer to be integrated into the PPC matrix. Such a VIm-TFSI-modified PPC-based electrolyte (PPC-25IL) has an ionic conductivity of 8.2 × 10−5S cm−1at room temperature. Moreover, it enables a highly reversible Li plating/stripping for Li anode, resulting in a dramatically improved rate and cyclic performance of LiFePO4-Li all-solid-state batteries. The VIm-TFSI plasticizer not only increases the ionic conductivity of PPC-based electrolyte but also improves the interfacial comparability of PPC-based electrolyte with the electrode. This work proposes a new strategy to develop all-solid-state lithium battery for real applications.