High Performance Li-Ion Capacitor Laminate Cells

High performance Li-ion capacitor (LIC) laminate cells have been fabricated with activated carbon positive electrodes (PEs) and hard carbon/lithium stripes negative electrodes (NEs). The LIC laminate cells can achieve a maximum specific power of 6 kW kg -1 and a maximum power density of 12 kW L -1 . The specific energy and energy density of the LIC laminate cells are 14 Wh kg -1 and 28 Wh L -1 respectively, which is about 3 times of the traditional electric double layer capacitors (EDLCs). The DC life of such LIC cell has passed 2000 h testing while held at maximum operation voltage 3.8 V and 65 °C. Extended cycle performance under 50C rate of the LIC laminate cell has been tested: such LIC can remain 89% of the original discharge capacitance after 100,000 cycles without obvious changes in ESR value. When the LIC cell is charging and discharging under 125C rate, the cycle life is still more than 50,000 cycles. Figure 1