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Three‐Dimensional Porous CoFe 2 O 4 /Graphene Composite for Highly Stable Sodium‐Ion Batteries
Author(s) -
Zhou Dan,
Xue LiPing,
Wang Ning
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801519
Subject(s) - materials science , anode , graphene , composite number , lithium (medication) , nanoporous , chemical engineering , energy storage , nanotechnology , ion , electrode , composite material , chemistry , medicine , power (physics) , physics , organic chemistry , quantum mechanics , endocrinology , engineering
Sodium‐ion batteries (SIBs) are promising alternatives to lithium‐ion batteries (LIBs), because of the low cost and great potential in large‐scale energy storage. Herein, we present a simple two‐step hydrothermal route to construct a novel CoFe 2 O 4 /graphene composite. The composite is composed of nanoporous CoFe 2 O 4 hollow spheres that are well‐anchored onto nitrogen‐doped graphene sheets (CoFe 2 O 4 @3D‐NG) with a unique 3D network structure, which can not only offer short pathways for Na + diffusion and conductive networks for electron transport, but also render sufficient active sites for Na + interfacial reaction and rigid structural stability for volume expansion. When used as an anode material for SIBs, the CoFe 2 O 4 @3D‐NG electrode delivers an impressively high performance of Na storage, which includes a large initial discharge capacity of 596 mAh g −1 at 50 mA g −1 , a high rate capability of 79 mAh g −1 at 1000 mA g −1 , and a long cyclability of 118 mAh g −1 after 1200 cycles at 500 mA g −1 . This work indicates a promising way to design and fabricate advanced CoFe 2 O 4 ‐based anode materials for high‐performance Na‐storage.