Ultrastable and high-capacity carbon nanofiber anodes derived from pitch/polyacrylonitrile for flexible sodium-ion batteries
Ultrastable and high-capacity carbon nanofiber anodes derived from pitch/polyacrylonitrile for flexible sodium-ion batteries
复制标题
用于柔性钠离子电池的来自沥青/聚丙烯腈的超稳定和高容量碳纳米纤维阳极
DOI：
10.1016/j.carbon.2018.04.031
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发表时间：
2018-08-01
期刊：
影响因子：
10.9
通讯作者：
Qiu, Jieshan
中科院分区：
文献类型：
--
作者：
Wang, Yuwei;Xiao, Nan;Qiu, Jieshan
采用NH3处理煤焦油沥青/聚丙烯腈基静电纺丝纳米纤维制备自支撑柔性钠离子电池阳极。碳纳米管薄膜（NCF）由无序碳基体和均匀分布的石墨微区组成。无序碳基体与扩大的间距大大提高了纳索恩转移动力学。沥青的加入使石墨微区分布在整个基体中，形成导电网络，有利于电子的传递。由NH3处理产生的微孔/介孔与互连网络结构相结合，促进电解质进入电极和纳通扩散。得益于这些结构特征，NCF在半钠离子电池中实现了在0.1 A g（-1）下341 mA h g（-1）的高可逆容量。经10000次超长循环后，在1Ag（-1）和2Ag（-1）时，比容量仍分别保持在235和217 mAh g（-1）。此外，以NCFs为阳极，Na 3V 2（PO 4）（3）@C为阴极的柔性钠离子全电池具有良好的倍率性能和循环性能，在不同弯曲角度下放电平台稳定在3.3-2.2 V。这种新型的高性能碳纳米管膜阳极在未来的柔性和耐磨的钠离子电池中具有很大的潜力。(C)2018爱思唯尔有限公司版权所有
Free-standing flexible sodium-ion battery anodes are fabricated by NH3 treating coal tar pitch/polyacrylonitrile based electrospun nanofibers. The carbon nanofiber films (NCFs) consist of disordered carbon matrix with well distributed graphitic microdomains. The disordered carbon matrix with enlarged interlay distance greatly enhances Nathorn transfer kinetics. And the graphitic microdomains distributed throughout the entire matrix as a result of the addition of pitch form conductive network, which facilitates electron transfer. Micro/mesopores resulting from the NH3 treatment combined with interconnected network structure facilitate the access of electrolyte to the electrode and Nathorn diffusion. Benefiting from these structural features, NCFs achieve a high reversible capacity of 341 mA h g(-1) at 0.1 A g(-1) in the half sodium-ion cells. Even after an ultralong cycling of 10 000 times, specific capacities of 235 and 217 mA h g(-1) can still be retained at 1 and 2 A g(-1), respectively. Furthermore, the flexible sodium-ion full batteries which consist of NCFs anode and Na3V2(PO4)(3)@C cathode show excellent rate performance and good cycling capability, with a stable discharge plateau of 3.3-2.2 V under different flexing angles. This novel high-performance carbon nanofiber film anode holds great potential in future flexible and wearable sodium-ion batteries. (C) 2018 Elsevier Ltd. All rights reserved.