期刊
ELECTROCHIMICA ACTA
卷 164, 期 -, 页码 55-61出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.02.178
关键词
Electrochemical impedance spectroscopy; Core-shell structure; Nickel/Nickel oxide anode; Cyclic stability; Lithium-ion batteries
资金
- Tianjin Municipal Natural Science Foundation of China [14JCZDJC32200, 13JCZDJC33900]
- National Natural Science Foundation of China [51472180, 51272176]
- LPMT
- CAEP [KF14006]
- Academic Innovation Funding of Tianjin Normal University [52XC1404]
- Training Plan of Leader Talent of University in Tianjin
- Scientific Research Foundation for Returned Overseas Chinese Scholars of State Education Ministry
- program of Thousand Youth Talents in Tianjin of China
The electrochemical reaction kinetics of the porous core-shell structured Ni/NiO anode for Li ion battery application is systematically investigated by monitoring the electrochemical impedance evolution for the first time. The electrochemical impedance under prescribed condition is measured by using impedance spectroscopy in equilibrium conditions at various depths of discharge (DOD) during charge-discharge cycles. The Nyquist plots of the binder-free porous Ni/NiO electrode are interpreted with a selective equivalent circuit composed of solution resistance, solid electrolyte interphase (SEI) film, charge transfer and solid state diffusion. The impedance analysis shows that the change of charge transfer resistance is the main contribution to the total resistance change during discharge, and the surface configuration of the obtained electrode may experience significant change during the first two cycles. Meanwhile, the increase of internal resistance reduced the utilization efficiency of the active material may be another convincing factor to increase the irreversible capacity. In addition, the impedance evolution of the as-prepared electrode during charge-discharge cycles reveals that the slow growth of the SEI film is responsible for the capacity fading after long term cycling. As a result, several strategies are summarized to optimize the electrochemical performances of transition metal oxide anodes for lithium ion batteries. (C) 2015 Elsevier Ltd. All rights reserved.
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