Capacity Increase Investigation of Cu2Se Electrode by Using Electrochemical Impedance Spectroscopy

Cu 2 Se nanoflake arrays supported by Cu foams are synthesized by a facile hydrothermal method in this study. The Cu 2 Se materials are directly used as an anode for lithium ion batteries, which show superior cycle performance with significant capacity increase. Combining with previous reports and s...

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Published inFrontiers in chemistry Vol. 6; p. 221
Main Authors Li, Xiuwan, Zhang, Zhixin, Liu, Chaoqun, Lin, Zhiyang
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 12.06.2018
Subjects
capacity increase
Chemistry
Cu2Se
electrochemical impedance spectroscopy
lithium ion battery
polymeric film
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Summary:Cu 2 Se nanoflake arrays supported by Cu foams are synthesized by a facile hydrothermal method in this study. The Cu 2 Se materials are directly used as an anode for lithium ion batteries, which show superior cycle performance with significant capacity increase. Combining with previous reports and scanning electron microscope images after cycling, the capacity increase caused by the reversible growth of a polymeric film is discussed. Electrochemical impedance spectroscopy is used to test the reversible growth of the polymeric film. By analyzing the three-dimensional Nyquist plots at different potentials during the discharge/charge process, detailed electrochemical reaction information can be obtained, which can further verify the reversible formation of a polymeric film at low potential.
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This article was submitted to Physical Chemistry and Chemical Physics, a section of the journal Frontiers in Chemistry
Edited by: Qiaobao Zhang, Xiamen University, China
Reviewed by: Xiukang Yang, Xiangtan University, China; Hongshuai Hou, Central South University, China; Huixin Chen, Xiamen Institute of Rare Earth Materials, China
ISSN:2296-2646
2296-2646
DOI:10.3389/fchem.2018.00221