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Sodium storage in fluorine-rich mesoporous carbon fabricated by low-temperature carbonization of polyvinylidene fluoride with a silica template

机译:聚偏二氟乙烯与二氧化硅模板低温碳化制得的富氟介孔碳中的钠存储

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摘要

A facile and manageable method has been developed to prepare fluorine-doped mesoporous carbon by carbonizing polyvinylidene fluoride, a fluorine-contained carbon precursor, with a silica template for the first time. And it is argued that the F contents depend directly on carbonization temperatures. A mesoporous carbon with a high F-content of 8.35 at% is obtained at a low carbonization temperature of 500 degrees C. The fluorine-rich mesoporous carbon (FMC) possesses an enlarged interlayer spacing of 0.402 nm, an enhanced electrical conductivity and a mesopore based structure, exhibiting a remarkable electrochemical energy storage performance evaluated as a NIB anode, such as a high stable reversible capacity of 385 mA h g(-1) at 100 mA g(-1), a satisfactory initial coulombic efficiency of 59% and a high rate capability of 116 mA h g(-1) at 5 A g(-1).
机译:已经开发了一种容易且易于管理的方法,该方法通过将聚偏二氟乙烯(一种含氟的碳前体)首次与二氧化硅模板进行碳化来制备氟掺杂的中孔碳。并且认为F含量直接取决于碳化温度。在500摄氏度的低碳化温度下获得的高F含量为8.35 at%的中孔碳。富氟中孔碳(FMC)具有0.402 nm的更大层间距,增强的电导率和中孔基结构,表现出卓越的电化学储能性能,可作为NIB阳极进行评估,例如在100 mA g(-1)时具有385 mA hg(-1)的高稳定可逆容量,令人满意的59%的初始库仑效率和在5 A g(-1)时具有116 mA hg(-1)的高倍率能力。

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