Study on the Electrochemical Properties of Different Negative Electrode Materials for Li-Ion Capacitor

Lithium ion capacitors (LICs) were assembled using pre-lithiated carbon anode and activated carbon (AC) cathode. The electrochemical properties of various carbon materials such as artificial graphite, soft carbon and hard carbon have been investigated for use as a negative electrode for LICs. The rate capabilities and cycle durabilities were tested up to 200C and 5000 cycles using full cell configurations within cut-off voltage range between 2 and 4V. The soft carbon and hard carbon show good rate capability of about 53-54% retention (200C/10C in full cells with activated carbon cathode) and cycle life performance of more than 88% retention after 5000 cycles at the charge/discharge rate of 10C. Soft carbon and hard carbon display excellent performance at high current densities so that it can be considered as promising material for high performance LICs.