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首页> 外文期刊>Advanced energy materials >Single-Ion Conducting Electrolyte Based on Electrospun Nanofibers for High-Performance Lithium Batteries
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Single-Ion Conducting Electrolyte Based on Electrospun Nanofibers for High-Performance Lithium Batteries

机译：基于静电纺纳米纤维的单离子导电电解质用于高性能锂电池

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摘要

Herein, a novel electrospun single-ion conducting polymer electrolyte (SIPE) composed of nanoscale mixed poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and lithium poly(4,4 '-diaminodiphenylsulfone, bis(4-carbonyl benzene sulfonyl)imide) (LiPSI) is reported, which simultaneously overcomes the drawbacks of the polyolefin-based separator (low porosity and poor electrolyte wettability and thermal dimensional stability) and the LiPF6 salt (poor thermal stability and moisture sensitivity). The electrospun nanofiber membrane (es-PVPSI) has high porosity and appropriate mechanical strength. The fully aromatic polyamide backbone enables high thermal dimensional stability of es-PVPSI membrane even at 300 degrees C, while the high polarity and high porosity ensures fast electrolyte wetting. Impregnation of the membrane with the ethylene carbonate (EC)/dimethyl carbonate (DMC) (v:v = 1:1) solvent mixture yields a SIPE offering wide electrochemical stability, good ionic conductivity, and high lithium-ion transference number. Based on the above-mentioned merits, Li/LiFePO4 cells using such a SIPE exhibit excellent rate capacity and outstanding electrochemical stability for 1000 cycles at least, indicating that such an electrolyte can replace the conventional liquid electrolyte-polyolefin combination in lithium ion batteries (LIBs). In addition, the long-term stripping-plating cycling test coupled with scanning electron microscope (SEM) images of lithium foil clearly confirms that the es-PVPSI membrane is capable of suppressing lithium dendrite growth, which is fundamental for its use in high-energy Li metal batteries.
机译：本文中，一种新型的电纺单离子导电聚合物电解质（SIPE），由纳米级混合聚偏二氟乙烯-共六氟丙烯（PVDF-HFP）和聚（4,4'-二氨基二苯基砜，双（4-羰基苯磺酰基）锂）（酰亚胺）（LiPSI）的报道，它同时克服了聚烯烃基隔膜（低孔隙率和较差的电解质润湿性和热尺寸稳定性）和LiPF6盐（较差的热稳定性和湿度敏感性）的缺点。电纺纳米纤维膜（es-PVPSI）具有高孔隙率和适当的机械强度。完全芳香的聚酰胺主链即使在300摄氏度时也可以实现es-PVPSI膜的高热尺寸稳定性，而高极性和高孔隙率可确保快速润湿电解液。用碳酸亚乙酯（EC）/碳酸二甲酯（DMC）（v：v = 1：1）的溶剂浸渍膜可产生SIPE，该SIPE具有宽的电化学稳定性，良好的离子电导率和高锂离子转移数。基于上述优点，使用这种SIPE的Li / LiFePO4电池至少在1000次循环中显示出优异的倍率容量和出色的电化学稳定性，表明这种电解质可以代替锂离子电池（LIB）中的常规液体电解质-聚烯烃组合）。此外，长期剥离-镀覆循环测试与锂箔的扫描电子显微镜（SEM）图像相结合，清楚地证明es-PVPSI膜能够抑制锂枝晶生长，这对于其在高能量环境中的应用至关重要锂金属电池。

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  • 来源
    《Advanced energy materials》 |2019年第10期|1803422.1 -1803422.9|共9页
  • 作者

    Li Cuicui; Qin Bingsheng; Zhang Yunfeng; Varzi Alberto; Passerini Stefano; Wang Jiaying; Dong Jiaming; Zeng Danli; Liu Zhihong; Cheng Hansong;

  • 作者单位

    China Univ Geosci Wuhan, Fac Mat Sci & Chem, Sustainable Energy Lab, 388 Lumo RD, Wuhan 430074, Hubei, Peoples R China;

    KIT, POB 3640, D-76021 Karlsruhe, Germany|HIU, Helmholtzstr 11, D-89081 Ulm, Germany;

    China Univ Geosci Wuhan, Fac Mat Sci & Chem, Sustainable Energy Lab, 388 Lumo RD, Wuhan 430074, Hubei, Peoples R China;

    KIT, POB 3640, D-76021 Karlsruhe, Germany|HIU, Helmholtzstr 11, D-89081 Ulm, Germany;

    KIT, POB 3640, D-76021 Karlsruhe, Germany|HIU, Helmholtzstr 11, D-89081 Ulm, Germany;

    China Univ Geosci Wuhan, Fac Mat Sci & Chem, Sustainable Energy Lab, 388 Lumo RD, Wuhan 430074, Hubei, Peoples R China;

    China Univ Geosci Wuhan, Fac Mat Sci & Chem, Sustainable Energy Lab, 388 Lumo RD, Wuhan 430074, Hubei, Peoples R China;

    China Univ Geosci Wuhan, Fac Mat Sci & Chem, Sustainable Energy Lab, 388 Lumo RD, Wuhan 430074, Hubei, Peoples R China;

    Dongguan Univ Technol, Sch Environm & Civil Engn, 1 Daxue Rd, Dongguan 523808, Guangdong, Peoples R China;

    China Univ Geosci Wuhan, Fac Mat Sci & Chem, Sustainable Energy Lab, 388 Lumo RD, Wuhan 430074, Hubei, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    lithium batteries; lithium metal; perfluoroselfonylimide; polymer electrolytes; single-ion Li conductors;

    机译：锂电池;金属锂;全氟自己酰亚胺;聚合物电解质;单离子锂导体;

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