title: Electrospinning Synthesis of Mesoporous MnCoNiOx@Double-Carbon Nanofibers for Sodium-Ion Battery Anodes with Pseudocapacitive Behavior and Long Cycle Life.
abstract: In this work, MnCoNiOx(denoted as MCNO) nanocrystals (with a size of less than 30 nm) finely encapsulated in double-carbon (DC, including reduced graphene oxide and amorphous carbon derived by polymer) composite nanofibers (MCNO@DC) were successfully synthesized via an electrospinning method followed by a sintering treatment. The as-obtained MCNO@DC nanofibers present superior sodium storage performance and retain an especially high specific capacity of 230 mAh g-1with a large capacity retention of about 96% at 0.1 A g-1after 500 cycles and a specific capacity of 107 mAh g-1with capacity retention of about 89% at 1 A g-1after 6500 cycles. The outstanding cycle characteristic is mainly due to the tiny MCNO nanoparticles, which shorten the ion migration distance, and the three-dimensional DC framework, which remarkably promotes the electronic transfer and efficiently limits the volume expansion during the progress of insertion and extraction of Na+ions. Moreover, nitrogen doped in carbon is able to improve the electrochemical capability as well. Finally, kinetic analysis of the redox reactions is used to verify the pseudocapacitive mechanism in charge storage and the feasibility of using MCNO@DC composite nanofibers as an anode for sodium-ion batteries with the above-mentioned behavior.
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics , Lanzhou 730000, P. R. China.|University of Chinese Academy of Sciences , Beijing 100039, P.R. China.
authors.forename: Lijun
authors.initials: L
authors.lastname: Wu
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics , Lanzhou 730000, P. R. China.
authors.forename: Junwei
authors.initials: J
authors.lastname: Lang
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics , Lanzhou 730000, P. R. China.
authors.forename: Rutao
authors.initials: R
authors.lastname: Wang
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics , Lanzhou 730000, P. R. China.
authors.forename: Ruisheng
authors.initials: R
authors.lastname: Guo
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics , Lanzhou 730000, P. R. China.
authors.forename: Xingbin
authors.identifier: http://orcid.org/0000-0002-9976-8815
authors.initials: X
authors.lastname: Yan
keywords: anode; carbon-encapsulating; pseudocapacitive behavior; sodium-ion battery; transition-metal oxide