Capacity Increase Investigation of Cu2Se Electrode by Using Electrochemical Impedance Spectroscopy | Zendy

Xiuwan Li | Zendy; Zhixin Zhang | Zendy; Chaoqun Liu | Zendy; Zhiyang Lin | Zendy

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Capacity Increase Investigation of Cu2Se Electrode by Using Electrochemical Impedance Spectroscopy

Author(s) -

Xiuwan Li,

Zhixin Zhang,

Chaoqun Liu,

Zhiyang Lin

Publication year - 2018

Publication title -

frontiers in chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.027

H-Index - 52

ISSN - 2296-2646

DOI - 10.3389/fchem.2018.00221

Subject(s) - dielectric spectroscopy , nyquist plot , materials science , anode , electrochemistry , electrode , lithium (medication) , scanning electron microscope , chemical engineering , ion , electrical impedance , spectroscopy , analytical chemistry (journal) , nanotechnology , chemistry , composite material , electrical engineering , chromatography , organic chemistry , medicine , engineering , endocrinology , physics , quantum mechanics

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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