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One‐Step Synthesis of 3D‐Sandwiched Na 3 V 2 (PO 4 ) 2 O 2 F@rGO Composites as Cathode Material for High‐Rate Sodium‐Ion Batteries
Author(s) -
Chen Hao,
Mi Hongwei,
Sun Lingna,
Zhang Peixin,
Li Yongliang
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800740
Subject(s) - graphene , materials science , electrochemistry , cathode , oxide , composite number , composite material , conductivity , hydrothermal circulation , carbon fibers , ion , chemical engineering , electrode , nanotechnology , chemistry , metallurgy , organic chemistry , engineering
Na 3 V 2 (PO 4 ) 2 O 2 F@reduced graphene oxide composites are rapidly synthesized by one‐step microwave‐assisted hydrothermal method within 1 h without any following energy‐consuming process. The composite shows a three‐dimensional sandwiched structure with carbon wrapping and is applied as cathode material for sodium‐ion batteries. It delivers a reversible capacity of 100.5 mAh g −1 and a capacity retention rate of 84.9 % at 20 C after 2000 cycles, exhibiting excellent rate capability and cyclability. This superior electrochemical performance is attributed to the synergetic effect from the enhanced electronic conductivity and the improved electrochemical kinetic behavior.