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Synthesis of 3D Flower‐like Nanocomposites of Nitrogen‐Doped Carbon Nanosheets Embedded with Hollow Cobalt(II,III) Oxide Nanospheres for Lithium Storage
Author(s) -
Yang Qi,
Zhao Zongbin,
Dong Yanfeng,
Liu Yang,
Liu Xu,
Tang Yongchao,
Wang Yuwei,
Wang Xuzhen,
Qiu Jieshan
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600497
Subject(s) - anode , materials science , nanocomposite , lithium (medication) , electrochemistry , carbon fibers , cobalt , chemical engineering , cobalt oxide , oxide , nitrogen , fabrication , nanotechnology , electrode , composite material , composite number , chemistry , metallurgy , organic chemistry , medicine , alternative medicine , pathology , endocrinology , engineering
Despite a high theoretical specific capacity (890 mA h g −1 ) as an anode material for Li‐ion batteries, Co 3 O 4 has not been used in practice due to its inferior mechanical stability and poor electrical conductivity. Herein, we synthesized three‐dimensional (3D) flower‐like nanocomposites consisting of nitrogen‐doped carbon nanosheets decorated with hollow Co 3 O 4 nanospheres (H‐Co 3 O 4 @ N ‐CNSs) with an ultrahigh loading mass (83 wt %) of Co 3 O 4 . The H‐Co 3 O 4 @ N ‐CNSs exhibited excellent performance of 750 mA h g −1 at 500 mA g −1 and 700 mA h g −1 at 1000 mA g −1 after 400 cycles and a high capacity retention rate of 93.75 % at 500 mA g −1 . This excellent electrochemical performance was attributed to a synergistic effect between the hollow Co 3 O 4 nanospheres, the N‐doped carbon nanosheets, and the pores between adjacent carbon nanosheets. Our suggested fabrication strategy for creating a hierarchical structure has great potential for the design of high‐performance anode materials.