title: Free-standing Na(2/3)Fe(1/2)Mn(1/2)O(2)@graphene film for a sodium-ion battery cathode.
abstract: The development of high-performance cathodes for sodium-ion batteries remains a great challenge, while low-cost, high-capacity Na2/3Fe1/2Mn1/2O2 is an attractive electrode material candidate comprised of earth-abundant elements. In this work, we designed and fabricated a free-standing, binder-free Na2/3Fe1/2Mn1/2O2@graphene composite via a filtration process. The porous composite led to excellent electrochemical performance due to the facile transport for electrons and ions that was characterized by electrochemical impedance spectroscopy at different temperatures. The electrode delivered a reversible capacity of 156 mAh/g with high Coulombic efficiency. The importance of a fluorinated electrolyte additive with respect to the performance of this high-voltage cathode in Na-ion batteries was also investigated.
authors.affiliation: Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Hongli
authors.initials: H
authors.lastname: Zhu
authors.forename: Kang Taek
authors.initials: KT
authors.lastname: Lee
authors.forename: Gregory Thomas
authors.initials: GT
authors.lastname: Hitz
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Han
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Li
authors.forename: Jiayu
authors.initials: J
authors.lastname: Wan
authors.forename: Steven
authors.initials: S
authors.lastname: Lacey
authors.forename: Arthur von Wald
authors.initials: Av
authors.lastname: Cresce
authors.forename: Kang
authors.initials: K
authors.lastname: Xu
authors.forename: Eric
authors.initials: E
authors.lastname: Wachsman
authors.forename: Liangbing
authors.initials: L
authors.lastname: Hu