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NANOTECHNOLOGY · 2022 ·Vol. 33 ·期 42 ·425601 · IF 3.953

Sepiolite and ZIF-67 co-modified PAN/PVdF-HFP nanofiber separators for advanced Li-ion batteries

Wenwu Jiang,Yi Han,Yanhuai Ding

Electrospun PAN/PVdF-HFP membranes have the potential to be used as separators for Li-ion batteries owing to their good mechanical properties and high chemical stability. However, the application of PAN/PVdF-HFP separators has been hampered by their poor electrochemical performances. In this study, semi-aligned PAN/PVdF-HFP nanofiber separators have been fabricated by an electrospinning technology. Sepiolite and ZIF-67 co-modification was employed to enhance the physical properties of the PAN/PVdF-HFP separators. The test cells with the as-prepared composite separator showed better electrochemical performance than the commercial and raw PAN/PVdF-HFP separators.

CAS / MDL: 693-98-1

研究领域: 材料科学 · 能源存储 · 纳米技术 · 电化学

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JOURNAL OF MEMBRANE SCIENCE · 2023 · IF 9.5

Mussel stimulated modification of flexible Janus PAN/PVDF-HFP nanofiber hybrid membrane for advanced lithium-ion batteries separator

Mao Guo,Jing Xiong,Xuanyang Jin,Shengjun Lu,Yufei Zhang,Jian Xu,Haosen Fan

Bicomponent polyacrylonitrile/Poly(vinylidene fluoride-co-hexafluoropropylene) (PAN/PVDF-HFP) Janus nanofibers based hybrid membrane was successfully prepared by parallel electrospinning technology. Subsequently, modified PAN/PVDF-HFP hybrid membrane (M-PAN/PVDF-HFP) was further fabricated via mimicking the adhesive of mussel by coating dopamine alternative through polymerization of catechol and tetraethylenepentamine (TEPA) in weakly alkali solution. M-PAN/PVDF-HFP maintains the abundant pore structure of the electrospun hybrid membrane and further provides excellent electrolyte infiltration with high porosity (82.09%) and outstanding electrolyte retention (553.23%). Simultaneously, the mechanical strength of the separator was significantly improved (14.36 MPa). Electrochemical studies displayed that the M-PAN/PVDF-HFP composite membrane delivered superior ion conductivity (2.81 mS/cm) and wide electrochemical stability window (∼5.25 V). The cell assembled by M-PAN/PVDF-HFP separator presented outstanding rate capability with high specific capacity of 147 mAh/g at 1 C and excellent cycle stability with discharge capacity of 120 mAh/g at 1 C after 600 cycles. Furthermore, M-PAN/PVDF-HFP separator exhibited ultra-flexibility with remarkable electrochemical performance after repeated bending for 500 to 1000 time. This work provides new insights into polyamine modified hybrid membranes for the potential practical applications in lithium-ion batteries separator.

研究领域: 材料科学 · 电化学 · 纳米技术 · 能源存储

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Sepiolite and ZIF-67 co-modified PAN/PVdF-HFP nanofiber separators for advanced Li-ion batteries

Mussel stimulated modification of flexible Janus PAN/PVDF-HFP nanofiber hybrid membrane for advanced lithium-ion batteries separator