关键词: 预锂化, 锂离子电容器, 比功率, 比能量

Abstract:

The positive electrode was a lithium titanate@activated carbon composite material, and the negative electrode was commercial hard carbon. A series of steps were taken to prepare a lithium-ion capacitor (LIC) with pre-inserted lithium hard carbon/lithium titanate@ activated carbon. Pre-intercalating hard carbon with various lithium contents resulted in a variety of pre-inserted lithium hard carbon pole pieces in this thesis. The LIC assembled with the prepared pre-inserted lithium hard carbon pole pieces was then electroporated in a series of steps. The chemical performance test investigated the effect of lithium insertion into the hard carbon pole piece on the specific energy and specific power of LIC. The results showed that doping lithium powder in hard carbon can significantly increase the specific energy of LIC while decreasing its specific power. The assembled LIC when the mass ratio of hard carbon to lithium powder was 3∶1 was one of them. After 2000 cycles of charge and discharge at a current density of 2 A/g, the energy density can reach 29.69 W·h/kg, the power density can reach 7.57 kW/kg, and the capacity retention rate can reach 83.11%.

Key words: pre-embedded lithium, lithium ion capacitor, specific power, specific energy