Electrochemical performance of pre-lithiated graphite as negative electrode in lithium-ion capacitors |
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Authors: | Meirong Yuan Weiqiang Liu Yongfa Zhu Yongjin Xu |
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Institution: | 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
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Abstract: | 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 1–20 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. |
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