title: Free-standing and binder-free sodium-ion electrodes with ultralong cycle life and high rate performance based on porous carbon nanofibers.
abstract: Free-standing and binder-free porous carbon nanofibers (P-CNFs) electrodes were prepared by pyrolysis of PAN-F127/DMF nanofibers via an electrospinning process as potential anodes for Na-ion batteries (NIB). The P-CNFs delivers a reversible capacity of 266 mA h g(-1) after 100 cycles at 0.2 C, corresponding to ~80% of the initial charge capacity. When cycled at a current density as high as 500 mA g(-1) (2 C), it still delivers a reversible capacity of ~140 mA h g(-1) after 1000 cycles. The improvement of electrochemical performance is attributed to the special design and microstructure of P-CNFs, which conferred a variety of advantages: hierarchical porous channels enabling short transport length for ions and electrons, 3D interconnected structure resulting in low contact resistances, good mechanical properties leading to the excellent morphology stability.
authors.affiliation: CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, P. R. China. yanyumse@ustc.edu.cn.
authors.forename: Weihan
authors.initials: W
authors.lastname: Li
authors.forename: Linchao
authors.initials: L
authors.lastname: Zeng
authors.forename: Zhenzhong
authors.initials: Z
authors.lastname: Yang
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.forename: Jiaqing
authors.initials: J
authors.lastname: Wang
authors.forename: Xiaowu
authors.initials: X
authors.lastname: Liu
authors.forename: Jianxiu
authors.initials: J
authors.lastname: Cheng
authors.forename: Yan
authors.initials: Y
authors.lastname: Yu
mesh_terms: D002244:Carbon / Q000737:chemistry*; D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry; D057139:Nanofibers / Q000737:chemistry*; D016062:Porosity; D012964:Sodium / Q000737:chemistry*
chemical_list: D007477:Ions; D002244:Carbon; D008094:Lithium; D012964:Sodium