Thermostable and nonflammable silica–polyetherimide–polyurethane nanofibrous separators for high power lithium ion batteries

文献情報

出版日 2015-04-13

DOI 10.1039/C5TA00856E

インパクトファクター 12.732

著者

Ke Xiao, Jianyong Yu, Jianmao Yang

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要旨

Safety remains a practical concern in lithium ion batteries (LIBs), which is closely associated with the internal shorting caused by the poor dimensional thermostability at elevated temperature and the flammability of separators. Here, we report a novel strategy to fabricate thermostable and nonflammable silica–polyetherimide–polyurethane (SiO2–PEI–PU) nanofibrous membranes via an electrospinning process. Benefiting from the high porosity, interpenetrating network structure and synergetic effect of silica nanoparticles, PEI and PU, the as-prepared SiO2–PEI–PU membranes exhibit uniform pore size distribution, high ionic conductivity (6.25 mS cm−1) and good electrochemical stability up to 4.86 V. Notably, the hot oven and combustion tests reveal that the SiO2–PEI–PU membranes possess improved thermostability displaying 2% dimensional change after exposure to 170 °C for 0.5 h and flame retardant properties, which could be beneficial for improving the safety of LIBs. Significantly, the SiO2–PEI–PU membrane based Li/LiFePO4 cell exhibits more excellent cyclability delivering a discharge capacity of 158.91 mA h g−1 at the 90th cycle and better rate capability compared with the cell based on the Celgard membrane. Meanwhile, the SiO2–PEI–PU membrane based Li/LiFePO4 cell also shows more excellent cell performance even at an elevated temperature of 60 °C. The results clearly demonstrate that the SiO2–PEI–PU membranes are promising separator candidates, which will also pave the way for further application of nanofibrous membranes in high power LIBs.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

Thermostable and nonflammable silica–polyetherimide–polyurethane nanofibrous separators for high power lithium ion batteries

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