Electrochemical performance of SiCN embedded carbon (SiCN–C) fiber mat electrodes for lithium-ion battery: Electrospinning polysilazane in air or protective atmosphere
Electrochemical performance of SiCN embedded carbon (SiCN–C) fiber mat electrodes for lithium-ion battery: Electrospinning polysilazane in air or protective atmosphere
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DOI：
10.1016/j.oceram.2023.100351
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
H. Ramlow;C. Marangoni;Günter Motz;Gurpreet Singh;R. Machado
中科院分区：
文献类型：
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作者：
H. Ramlow;C. Marangoni;Günter Motz;Gurpreet Singh;R. Machado
采用静电纺丝的方法在空气或保护气氛中制备了聚硅氮烷/聚丙烯腈纤维毡。热解后的SiCN包埋碳(SiCN-C)作为锂离子电池(Lib)电极进行了测试。发现在氮气中电纺的纤维较薄，这是因为飞行射流的凝固速度较慢。XPS分析证实，在空气中电纺的纤维在成形过程中含有大量的氧。在空气中电纺的SiCN-C在50 mA/−时的最大充电容量为773 mA/−。氧气对Li+离子具有很强的吸附能力，提高了电极的容量，但在空气中电纺的SiCN-C却存在电压滞后现象。相反，在氮气中电纺的SiCN-C表现出稳定的循环性能，充电容量为299mA/h g−1，由于游离碳含量的增加，初始容量恢复了98%。这些发现使静电纺丝在高度控制生产独立式SiCN纤维垫电极方面非常有希望。
Here polysilazane/polyacrylonitrile fiber mats were manufactured by electrospinning in air or protective atmosphere. After pyrolysis, SiCN embedded carbon (SiCN–C) was tested as lithium-ion battery (LIB) electrode. Fibers electrospun in nitrogen are found to be thinner due to the slower solidification of the flying jet. XPS analysis confirmed that fibers electrospun in air incorporated a great oxygen content during shaping. The highest charge capacity of 773 mA h g−1at 50 mA g−1was recovered for SiCN–C electrospun in air. Oxygen increased the capacity due to its high character to attract Li+ions, but SiCN–C electrospun in air suffered voltage hysteresis. Contrariwise, the SiCN–C electrospun in nitrogen demonstrated stable cycling with a charge capacity of 299 mA h g−1and 98% recovery of the initial capacity due to enhanced free carbon content. These findings make electrospinning very promising for the highly controlled production of freestanding SiCN fiber mat electrodes.