材料科学
分离器(采油)
法拉第效率
共聚酯
化学工程
电解质
纳米纤维
复合材料
静电纺丝
润湿
锂离子电池
阻燃剂
聚合物
电池(电)
聚酯纤维
功率(物理)
化学
物理
物理化学
电极
量子力学
工程类
热力学
作者
Ping‐Hui Duan,Meichen Liu,Lin Chen,Man‐Cheng Long,Gang Wu,Xiu‐Li Wang,Yu‐Zhong Wang
标识
DOI:10.1016/j.mtener.2023.101462
摘要
The essential role of separators in battery safety and electrochemical performance makes it necessary to create advanced separators for next-generation energy storage systems. However, conventionally commercial polyolefin separators often have problems with poor thermal stability and insufficient electrolyte wettability, resulting in restricted battery performance and serious safety issues of lithium-ion batteries. Herein, we report a separator composed of silica (SiO2) nanoparticles and intrinsically flame-retardant copolyester P(ET-co-PN)5 electrospun nanofibers, i.e. SiO2@P(ET-co-PN)5 (SP) separator. The copolyester nanofiber's three-dimensional skeleton filled with close-packed SiO2 nanoparticles endows the separator with good mechanical performance (tensile strength of 9.8 MPa) and electrolyte wettability (electrolyte uptake of 333%), superior heatproof and fireproof properties (no shrinkage at 250 °C, PHRR of 111.6 W g-1 and THR of 9.4 kJ g-1). The LiFePO4/SP/Li cells exhibit high capacity of 150.2 mAh g-1, high average Coulombic efficiency of nearly 100%, and impressive capacity retention close to 100% after 220 cycles at 0.5 C. Notably, the LiFePO4/SP/Li cells can endure 1000 cycles at 5 C with 53% of capacity retention and approximately 100% of Coulombic efficiency. Moreover, it delivers an initial capacity of 148 mAh g-1 and retains 123.2 mAh g-1 over 45 cycles at 120 °C.
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