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High Rate Capability and Enhanced Cyclability of Na 3 V 2 (PO 4 ) 2 F 3 Cathode by In Situ Coating of Carbon Nanofibers for Sodium‐Ion Battery Applications
Author(s) -
Zhao Jing,
Gao Yu,
Liu Qiang,
Meng Xing,
Chen Nan,
Wang Chunzhong,
Du Fei,
Chen Gang
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201704131
Subject(s) - cathode , anode , materials science , electrochemistry , composite number , sodium , coating , chemical vapor deposition , electrode , energy storage , carbon fibers , carbon nanofiber , chemical engineering , nanotechnology , composite material , carbon nanotube , chemistry , metallurgy , power (physics) , physics , quantum mechanics , engineering
A facile chemical vapor deposition method is developed for the preparation of carbon nanofiber (CNF) composite Na 3 V 2 (PO 4 ) 2 F 3 @C as cathodes for sodium‐ion batteries. In all materials under investigation, the optimized composite content, denoted as NVPF@C@CNF‐5, shows excellent sodium storage performance (86.3 % capacity retention over 5000 cycles at 20 C rate) and high rate capability (84.3 mA h g −1 at 50 C). The superior sodium storage performance benefits from the enhanced electrical conductivity of the working electrode after formation of a composite with CNF. Furthermore, the full cell using NVPF@C@CNF‐5 and hard carbon as the cathode and anode, respectively, demonstrates an impressive electrochemical performance, realizing an ultrahigh rate charge/discharge at a current rate of 30 C and long‐term stability over 1000 cycles. This approach is facile and effective, and could be extended to other materials for energy‐storage applications.