title: Double-Nanocarbon Synergistically Modified Na3V2(PO4)3: An Advanced Cathode for High-Rate and Long-Life Sodium-Ion Batteries.
abstract: An advanced cathode material, nitrogen-doped carbon-coated Na3V2(PO4)3 hybriding with multiwalled carbon nanotubes (CNTs) composite, namely double-nanocarbon synergistically modified Na3V2(PO4)3 of sodium ion battery, was fabricated through a simple sol-gel approach. According to the systemical analysis of experimental results on this composite structure, it is found that N-doping not only increases Na-ion migration velocity across the carbon-coated layer but also improves the electric conductivity of the carbon layer. More importantly, the CNTs 3D conducting network could significantly accelerate the electron transport between multiple particles of Na3V2(PO4)3, due to the intimate contacts between active materials and CNTs. Consenquently, the electrochemical properties of this double-nanocarbon-modified Na3V2(PO4)3 are significantly enhanced, especially the high-rate capability and long cycle life. For instance, its initial capacity of 94.5 mAh g(-1) at 0.2 C decreases to 70 mAh g(-1) at 70 C, and the capacity retention is 74%. Moreover, when dischage rate increases to a higher 30 C, the capacity retention is still as high as 87% after 300 cycles.
authors.affiliation: Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power , Shanghai 200090, China.|State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Shen
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology , Beijing 100081, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University , Shanghai 200433, China.
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Guo
authors.affiliation: Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power , Shanghai 200090, China.|State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, China.
authors.forename: Cong
authors.initials: C
authors.lastname: Wang
authors.affiliation: Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power , Shanghai 200090, China.
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Li
authors.affiliation: Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power , Shanghai 200090, China.
authors.forename: Qunjie
authors.initials: Q
authors.lastname: Xu
authors.affiliation: Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power , Shanghai 200090, China.|State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, China.
authors.forename: Haimei
authors.initials: H
authors.lastname: Liu
authors.affiliation: Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University , Shanghai 200433, China.
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University , Shanghai 200433, China.
authors.forename: Yongyao
authors.initials: Y
authors.lastname: Xia
keywords: Na3V2(PO4)3; carbon nanotubes; cathode; doping; sodium ion batteries