title: Cascading Boost Effect on the Capacity of Nitrogen-Doped Graphene Sheets for Li- and Na-Ion Batteries.
abstract: Specific capacity and cyclic performance are critically important for the electrode materials of rechargeable batteries. Herein, a capacity boost effect of Li- and Na-ion batteries was presented and clarified by nitrogen-doped graphene sheets. The reversible capacities progressively increased from 637.4 to 1050.4 mAh g-1(164.8% increase) in Li-ion cell tests from 20 to 185 cycles, and from 187.3 to 247.5 mAh g-1(132.1% increase) in Na-ion cell tests from 50 to 500 cycles. The mechanism of the capacity boost is proposed as an electrochemical induced cascading evolution of graphitic N to pyridinic and/or pyrrolic N, during which only these graphitic N adjacent pyridinic or pyrrolic structures can be taken precedence. The original and new generated pyridinic and pyrrolic N have strengthened binding energies to Li/Na atoms, thus increased the Li/Na coverage and delivered a progressive capacity boost with cycles until the entire favorable graphitic N transform into pyridinic and pyrrolic N.
authors.affiliation: School of Advanced Materials, Peking University, Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Lei-Lei
authors.initials: LL
authors.lastname: Tian
authors.affiliation: School of Advanced Materials, Peking University, Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Si-Bai
authors.initials: SB
authors.lastname: Li
authors.affiliation: School of Advanced Materials, Peking University, Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Ming-Jian
authors.initials: MJ
authors.lastname: Zhang
authors.affiliation: School of Advanced Materials, Peking University, Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Shuan-Kui
authors.initials: SK
authors.lastname: Li
authors.affiliation: School of Advanced Materials, Peking University, Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Ling-Piao
authors.initials: LP
authors.lastname: Lin
authors.affiliation: School of Advanced Materials, Peking University, Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Jia-Xin
authors.initials: JX
authors.lastname: Zheng
authors.affiliation: School of Materials Science and Engineering, China University of Mining & Technology , Xuzhou 221116, China.
authors.forename: Quan-Chao
authors.initials: QC
authors.lastname: Zhuang
authors.affiliation: School of Advanced Materials, Peking University, Shenzhen Graduate School , Shenzhen 518055, China.|Electrochemical Technology Program, Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Khalil
authors.initials: K
authors.lastname: Amine
authors.affiliation: School of Advanced Materials, Peking University, Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Pan
keywords: capacity boost; cyclic performance; first-principles calculation; lithium ion battery; nitrogen-doped graphene; sodium ion battery