Electrochemical performance of pre-lithiated graphite as negative electrode in lithium-ion capacitors
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- 作者：Meirong Yuan (1) (2)
Weiqiang Liu (1)
Yongfa Zhu (2)
Yongjin Xu (1) - 关键词：lithium ; ion capacitor ; Li intercalation ; electrochemical impedance spectroscopy ; Li pre ; doping ; graphite electrode
- 刊名：Russian Journal of Electrochemistry
- 出版年：2014
- 出版时间：November 2014
- 年：2014
- 卷：50
- 期：11
- 页码：1050-1057
- 全文大小：1,270 KB
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Weiqiang Liu (1)
Yongfa Zhu (2)
Yongjin Xu (1)
1. Shenzhen Key Laboratory of Electrochemical Energy Storage Devices, Research Institute of Tsinghua University in Shenzhen, Shenzhen, 518057, China
2. Department of Chemistry, Tsinghua University, Beijing, 10084, China- ISSN：1608-3342
- 作者单位：Meirong Yuan (1) (2)
文摘
Electrochemical performance of the pre-lithiated graphite and the as-assembled lithium-ion capacitors (LICs) were investigated within the Li/graphite two-electrode cell and activated carbon (AC)/graphite two-electrode cell, respectively. The morphologies of the electrodes were characterized by scanning electron microscopy (SEM). The Li intercalation of Li/graphite two-electrode cell was performed using short circuiting and galvanostatic charging techniques. The Li pre-doping process was characterized by electrochemical impedance spectroscopy (EIS). The cycle performance of the LICs were investigated at the rates of 1-0 C between the cut-off voltage at 2 to 4 V. The results demonstrated that the LIC cells with 8 h pre-doping time have the best cycle performance at the high rate of 10 C. Li pre-doping methodology plays a crucial role in the electrochemical performance of the graphite electrode and the as-assembled LICs.