Energy Storage Science and Technology ›› 2016, Vol. 5 ›› Issue (6): 834-840.doi: 10.12028/j.issn.2095-4239.2016.0019

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Effect of the pre-lithiation capacity of mesocarbon microbeads anode on the performances of a flexible packaging lithium ion capacitors#br#

ZHANG Shijia, ZHANG Xiong, SUN Xianzhong, ZHAO Feifei, JIA Junxiang, MA Yanwei   

  1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2016-03-08 Revised:2016-03-23 Online:2016-11-01 Published:2016-11-01

Abstract: Lithium ion capacitors (LIC) are fabricated in flexible packaging using activated carbon (AC) cathode and mesocarbon microbeads (MCMB) anode with mass ratio of 1∶1. We use constant-voltage pre-lithiation method and the capacity are 100 mA•h/g, 200 mA•h/g, and 300 mA•h/g, respectively. Rate capability and cycle life at high C-rates are evaluated at the potential range of 2.0—4.0 V. The results reveal that the capacitance of LIC monomer is between 4—5 F and the optimal electrochemical performance is obtained in the LIC with pre-lithiation capacity of 200 mA•h/g1. The first charge-discharge energy density is 83.7 W•h/kg (based on active material mass of two electrodes), the power density is 8835.4 W/kg and the energy density is 40.3 W•h/kg at 120 C rate. The cycle performance is tested at 20 C rate, the energy density retention is 91.5% after 500 cycles and 86.5% after 1000 cycles.

Key words: lithium ion capacitor, flexible package, activated carbon, mesocarbon microbead, pre-lithiation