Electrospun poly(ionic liquid) nanofiber separators with high lithium-ion transference number for safe ionic-liquid-based lithium batteries in wide temperature range

被引：12
作者：
Yu, Lu [1 ]
Yu, Le [1 ]
Peng, Yitong [1 ]
Lan, Xiwei [1 ]
Hu, Xianluo [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
来源：
MATERIALS TODAY PHYSICS | 2022年 / 25卷
基金：
中国国家自然科学基金;
关键词：
poly(ionic liquid)s; Separators; Lithium-ion transference number; Thermal safety; Accelerating rate calorimetry; LI-ION; THERMAL RUNAWAY; POLYMER ELECTROLYTES; CONDUCTIVITY; STABILITY; FIRE; ENHANCEMENT; WETTABILITY; PERFORMANCE; CHALLENGES;
D O I：
10.1016/j.mtphys.2022.100716
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ionic-liquid electrolytes (ILEs) promise high-safety lithium-metal batteries (LMBs) because of their wide electrochemical stability window and nonflammability. However, existing commercial polyolefin separators for LMBs are incompatible with ILEs owing to poor wettability and thermal stability. Also, conventional ILE/ separator systems suffer from the inherent sluggish Li+ transport kinetics. Here we report on a novel highly Li+conductive poly(ionic liquid) nanofiber membrane (PILNM) separator. It exhibits nonflammability, excellent thermal stability, and remarkable wettability with ILEs, achieving high ionic conductivity (3.81 mS cm-1) and significantly improved Li+ transference number (0.47). Benefiting from desirable interactions between the charged PILNM and ions of the ILE, the first solvation shell of [lithium-bis(trifluoromethane)sulfonimidex]1-x ([Li-TFSIx]1-x) complex is regulated. Fast Li+ transport and dendrite-free lithium metal anode are achieved. The PILNM combined with the ILE enables Li||LiFePO4 cells with enhanced capacities and rate capability in a wide temperature range from 25 degrees C to 120 degrees C. Notably, the thermal safety of Li|PILNM/ILE|LiFePO4 pouch cells at elevated temperatures has been further verified by adiabatic accelerating rate calorimetry. This work provides a new strategy to design and fabricate functionalized, thermally durable separators towards high-safety ILE-based LMBs.
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页数：9
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