Centrifugally spun TiO2/C composite fibers prepared from TiS2/PAN precursor fibers as binder-free anodes for LIBS
Centrifugally spun TiO2/C composite fibers prepared from TiS2/PAN precursor fibers as binder-free anodes for LIBS
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DOI：
10.1016/j.jpcs.2020.109795
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发表时间：
2021-02
影响因子：
4
通讯作者：
J. López;Ramiro Gonzalez;J. Ayala;J. Cantu;Alexandria Castillo;J. Parsons;Jason C. Myers;T. Lodge;M. Alcoutlabi
中科院分区：
文献类型：
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作者：
J. López;Ramiro Gonzalez;J. Ayala;J. Cantu;Alexandria Castillo;J. Parsons;Jason C. Myers;T. Lodge;M. Alcoutlabi
通过TiS2/聚丙烯腈（PAN）前驱体纤维的离心纺丝和随后的热处理制备了用于锂离子电池的TiO2/碳复合纤维负极。 TiS2/PAN 前驱体溶液是通过将 TiS2 纳米颗粒（二维层状结构）与 PAN 在 N,N-二甲基甲酰胺 (DMF) 中混合而制备的。对离心纺丝 PAN 纤维中的 TiS2 进行热处理，得到 TiO2/碳复合纤维。嵌入由 TiS2 起始材料合成的碳纤维基体中的 TiO2 纳米颗粒结构可以容纳大量的锂离子。 TiO2/C结构可以导致TiO2/C复合电极在长时间的充电/放电循环后增加比容量、改善稳定性和增强电化学性能。 TiO2/C复合纤维阳极在第一次循环时的放电和充电容量分别为683mAhg−1和356mAhg−1，在100mAg−1的电流密度下循环100次后，可逆充电容量为290mAhg−1。与单独的石墨阳极相比，TiO2/C 复合纤维在较高电流密度下表现出倍率性能的改善。
TiO2/carbon composite-fiber anodes for lithium ion batteries were prepared through the centrifugal spinning of TiS2/polyacrylonitrile (PAN) precursor fibers and subsequent thermal treatment. The TiS2/PAN precursor solutions were prepared by mixing TiS2nanoparticles (a 2-D layered structure) with PAN in N, N-dimethylformamide (DMF). The thermal treatment of the TiS2in the centrifugally spun PAN fibers resulted in TiO2/carbon composite fibers. The structure of TiO2nanoparticles embedded in the carbon-fiber matrix synthesized from the TiS2starting material may accommodate high amounts of Li ions. The TiO2/C structure may lead to increased specific capacity, improved stability, and enhanced electrochemical performance of the TiO2/C composite electrode after prolonged charge/discharge cycles. The TiO2/C composite-fiber anode delivered discharge and charge capacities at the first cycle of 683 mAhg−1and 356 mAhg−1, respectively, with a reversible charge capacity of 290 mAhg−1after 100 cycles at a current density of 100 mAg−1. The TiO2/C composite fibers showed an improvement in the rate performance at higher current densities compared to the graphite anode alone.