Six-armed and dicationic polymeric ionic liquid for highly stretchable, nonflammable and notch-insensitive intrinsic self-healing solid-state polymer electrolyte for flexible and safe lithium batteries
Six-armed and dicationic polymeric ionic liquid for highly stretchable, nonflammable and notch-insensitive intrinsic self-healing solid-state polymer electrolyte for flexible and safe lithium batteries
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DOI：
10.1016/j.cej.2021.132706
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发表时间：
2021-10-07
影响因子：
15.1
通讯作者：
Yang, Yong
中科院分区：
文献类型：
--
作者：
Li, Ruijing;Fang, Zhao;Yang, Yong
固态聚合物电解质（SPE）具有优异的柔性和自修复能力，在可靠的可穿戴电子设备中具有很大的应用前景。在此，高度可拉伸的（延展性2小时，25摄氏度）。此外，DPIL-6-SPE对锂电极呈现出上级粘附强度（重量负载200 g），这意味着优异的界面相容性。与单阳离子聚合物离子液体衍生的SPE（MPIL-6-SPE）相比，DPIL-6-SPE中的多阳离子中心有利于锂盐的解离，并使更多的Li+从TFSI-的捕获中释放出来，从而导致室温下上级离子电导率（超过10（-5）S cm（-1））和锂离子迁移数（0.46）。组装后的LiFePOoPIL-6-SPE/Li电池在0.1C下放电容量高达152.6mAh g（-1），50次循环后容量留存率达到94%，库仑效率为96%.特别是DPIL-6-SPE的机械性能和导电性在多次损坏后可以完全恢复，使衍生的软包电池在多角度弯曲和折叠时具有稳定的供电能力。多臂和多个充电的PIL的设计为开发具有自愈能力的柔性电子设备提供了新的途径。
Solid-state polymer electrolytes (SPEs) with outstanding flexibility and self-healing capacity are appealing for utilization in reliable and wearable electronic devices. Herein, a highly stretchable (extensibility 2 h, 25 celcius). Moreover, DPIL-6-SPE presents a superior adhesion strength (weight loading 200 g) towards lithium electrode, signifying excellent interfacial compatibility. Compared with the counterpart of monocationic polymeric ionic liquid derived SPE (MPIL-6-SPE), the multiple cationic center in DPIL-6-SPE facilitates the dissociation of lithium salt and liberates more Li+ from trapping with TFSI-, thereby resulting in a superior ionic conductivity (over 10(-5) S cm(-1) at room temperature) and lithium ion transference number (0.46). The as-assembled LiFePOoPIL-6-SPE/Li battery can deliver a high discharge capacity of 152.6 mAh g(-1) at 0.1C, and its capacity retention rate reaches 94% after 50 cycles with a coulombic efficiency of 96%. In particular, the mechanical properties and conductivity of DPIL-6-SPE can fully recover after repeated damage, conferring the derived soft-pack battery stable powering capacity upon multi-angle bending and folding. The design of multi-armed and multiple charged PILs provides new avenues for developing flexible electronic devices with self-healing capacity.