Abstract
An in situ–grown TiO2 membrane was prepared by an electrospinning method using polyacrylonitrile as the spinning precursor, combined with the TiO2 hydrolysis mechanism. The performance of tetrabutyl titanate and isopropyl titanate as two titanium source precursors hydrolyzed under the inhibition of acrylic acid to produce TiO2 with different contents for lithium-ion batteries was compared. The experimental results showed that when both titanium sources were prepared at 3 wt%, the comprehensive performance of the separator manufactured with tetrabutyl titanate as the titanium source (PAN/TBT-3) and isopropyl titanate as the titanium source (PAN/TPT-3) was finest than that of the Celgard 2400 and the composite membrane with direct TiO2 addition (PAN/TiO2-3). The tensile strength of PAN/TPT-3 and PAN/TBT-3 membranes were 7.82 MPa and 4.03 MPa higher than that of Celgard 2400, and 17.03 MPa and 13.29 MPa higher than that of PAN/TiO2-3 separator, respectively. PAN/TPT-3 and PAN/TBT-3 membranes exhibited a discharge capacity of 107.72 mAh/g and 115.79 mAh/g at 2 C, and both the capacity retention rate was above 99.5% higher than 80.5% for Celgard 2400.
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This work received funding from the Scientific and Project of Sichuan Province (E10106093) and the Project of Zigong High-Tech Zone Science and Technology Service Industry Cluster Construction (2021KJFWY010).
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Tang, L., Wu, Y., Lei, Z. et al. Electrospun PAN membranes strengthened in situ–grown TiO2 particles for high-performance lithium-ion batteries. Ionics 29, 4669–4679 (2023). https://doi.org/10.1007/s11581-023-05111-x
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DOI: https://doi.org/10.1007/s11581-023-05111-x