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Dually Decorated Na 3 V 2 (PO 4 ) 2 F 3 by Carbon and 3D Graphene as Cathode Material for Sodium‐Ion Batteries with High Energy and Power Densities
Author(s) -
Hu Lizhen,
Cheng Siqi,
Xiao Shunhua,
Li Wenna,
Chen Zhuo,
Li Wei,
Huang Bin,
Liu Qingquan,
Chen Quanqi
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000881
Subject(s) - calcination , carbon fibers , graphene , electrochemistry , materials science , hydrothermal circulation , diffusion , cathode , analytical chemistry (journal) , conductivity , ion , chemical engineering , chemistry , electrode , nanotechnology , composite number , composite material , chromatography , thermodynamics , biochemistry , physics , organic chemistry , engineering , catalysis
The dually decorated Na 3 V 2 (PO 4 ) 2 F 3 by in‐situ formed carbon and three‐dimensional graphene (NVPF/C@3DG) is prepared via two hydrothermal steps and a high‐temperature calcination. Benefiting from the high electronic conductivity of carbon and 3DG, high surface area and the resulted high diffusion coefficients of Na + , NVPF/C@3DG displays superior electrochemical performance to the control NVPF/C. Between 2.5 and 4.5 V (vs. Na + /Na), NVPF/C@3DG presents the initial discharge capacity of 123.6 mAh g −1 at 0.2 C (25.6 mA g −1 ) and capacity retention of 92.1 % after 60 cycles, while NVPF/C shows initial discharge capacity of 119 mAh g −1 and capacity retention of 84.1 % under the identical test conditions. Even at 15 C, the initial discharge capacity and capacity retention after 1000 cycles of NVPF/C@3DG are as high as 91.2 mAh g −1 and 82.9 %, respectively, much better than the initial discharge capacity of 71.2 mAh g −1 and the corresponding capacity retention of 76.4 % for NVPF/C, respectively.