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A Flexible, Binder‐Free Graphene Oxide/Copper Sulfides Film for High‐Performance Sodium Ion Batteries
Author(s) -
Liu Wen,
Shi Bin,
Wang Yong,
Li Yong,
Pei Haijuan,
Guo Rui,
Hou Xuwang,
Zhu Kai,
Xie Jingying
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800401
Subject(s) - graphene , current collector , materials science , electrode , oxide , copper , electrochemistry , energy storage , porosity , copper sulfide , chemical engineering , nanotechnology , supercapacitor , composite material , metallurgy , chemistry , electrolyte , power (physics) , physics , quantum mechanics , engineering
A flexible, binder‐free graphene oxide/copper sulfides (GO/CuS) film with 3D sandwich‐like structure and porous architecture is assembled by a vacuum filtration approach for sodium ion batteries. GO sheets in this flexible film‐electrode play a key role in enhancing the electrochemical performance. The CuS film‐electrode with a thickness of 50 μm delivers an initial discharge capacity of 639.0 mAh g −1 and remains a capacity retention of 81.3% (the second cycle) after 100 cycles at 0.10 C, significantly higher than those of conventional CuS electrode with Al current collector. Furthermore, the flexible, binder‐free GO/CuS electrode displays notably improved rate performance, evidencing the potential for wearable energy storage devices.