Lithium Ion Capacitors for Component Science (I)

1. Brief description

Lithium-ion capacitors are hybrid capacitors that have two advantages at the same time: the "long life" of double-layer capacitors that can be repeatedly charged and discharged, and the "high capacity density" of lithium-ion secondary batteries. This type of ion capacitor uses a technique in which lithium ions are preliminarily doped on the negative electrode and can be used at a low voltage of 3.8V. In addition, it does not contain heavy metals that can pollute the environment and is an environmentally friendly capacitor.

2. The principle and structure

A lithium ion capacitor is a capacitor having both an electric double layer capacitor and a lithium ion secondary battery. It utilizes the principle of a general electric double layer capacitor while the negative electrode material uses a carbon material that can absorb lithium ions and adds thereto. Lithium ions increase energy density. It is an asymmetric capacitor with different anode and cathode principles. It adopts a structure in which a cathode of an electric double layer capacitor and a cathode of a lithium ion secondary battery are combined together. The anode uses a double electric layer and is charged and discharged by a physical action. Charge and discharge through the redox reaction of lithium. Compared with the previous capacitors, the energy density is high, mainly because lithium ions are preliminarily doped in the negative electrode, and the electrostatic capacity of the negative electrode increases.

3. Characteristics

With high temperature reliability and safety, this is the outstanding characteristic of lithium ion capacitors.

High temperature reliability also available at 85°C

Compared with the electric double layer capacitor, the high temperature load characteristic is excellent. The high safety of materials that are not easy to catch fire

Compared with lithium ion secondary batteries, it is not easy to cause thermal runaway and ensure safety;

Less self-discharge, as a standby power supply for the machine can also play a role;