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论文类型：期刊论文
发表时间：2018-08-01
发表刊物：CARBON
收录刊物：SCIE
卷号：135
页面范围：187-194
ISSN号：0008-6223
摘要：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.