A Simple Way of Pre-Doping Lithium Ion into Carbon Negative Electrode for Lithium Ion Capacitor

Abstract:

A simple strategy of pre-doping lithium ion into carbon negative electrode for lithium ion capacitor was introduced. In this strategy, a kind of Li-containing compound was added directly into the positive electrode of the lithium ion capacitor (LIC). When the lithium ion capacitor was charging first time, the Li-containing compound releases Li+, and the pre-doping of lithium ion into the negative electrode was performed. Here, we developed a lithium ion capacitor using Meso-carbon microbeads (MCMB)/activated carbon (AC) as the negative and positive electrode materials, respectively and use the lithium iron phosphate (LiFePO4) as the Li-containing compound, which supply the Li+ ions for pre-doping. The results demonstrated that, by adding 20 percent of LiFePO4 into the positive electrode, the efficiency of the capacitor increases from lower than 60% up to higher than 90%, and the capacitor shows good capacitance characteristics and high capacity.

• Periodical: Materials Science Forum (Volume 650)
• Pages: 142-149
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.650.142
• Online since: May 2010
• Authors: Feng Wu, Hua Quan Lu, Yue Feng Su, Shi Chen, Yi Biao Guan
• Keywords: Activated Carbon (AC), LiFePO₄/C, Lithium Ion Capacitor, Meso-Carbon Microbead

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