What is a lithium ion capacitor (LIC)?
A lithium ion capacitor (LIC) is a capacitor that uses a carbon-based material capable of absorbing lithium ions as the negative electrode material, and improves energy density by adding lithium ions to it, while using the principles of a general electric double layer capacitor.
The principle of charging and discharging differs between the positive electrode and the negative electrode, and the structure combines the negative electrode of a lithium-ion battery and the positive electrode of an electric double layer.
While the positive electrode operates by the principal of physical, Electrical Double Layer, the negative electrode charges and discharges by the redox reaction of lithium. The high energy density compared to conventional capacitors is largely due to the fact that the pseudo electrostatic capacitance of the negative electrode is increased by pre-doping.
Comparison with various electric storage devices
Configuration and characteristics of various electric storage devices
Lithium ion capacitor (LIC) is a new electric storage device that combines high power density and high energy density. Compared to similar electricity storage devices, electrical double layer capacitor (EDLC) and lithium ion battery (LIB), we introduce its characteristics.
Storage principle and features of LIC
Storage principle and features of electrical double layer capacitors
Storage principle and features of lithium-ion batteries
Comparison of characteristics of various electric storage devices
|Lithium Ion Capacitor||Electrical Double Layer Capacitor||Lithium Ion Battery||Lead Acid Battery|
(Higher at high current)
(not good for rapid charge)
|Rapid charge/discharge||in seconds||in seconds||in hours
(Needs a charge control)
(Needs a refreshing charge)
|Internal resistance||Low||Low||High||Very high|
|Low temperature performance||Good||Good||Very bad||Bad|
|High temperature performance||Very good
(up to 70℃)
(up to 60℃)
(up to 40℃)
|Maintenance||Maintenance free||Maintenance free||Frequent replace required||Frequent replace required|
(float / cycling）
(sudden death occurs)
|Safety and flammability||High, flammable||High, flammable||Low, flammable
(Self heat up / igniting)
|High, not flammable|
|Application||Very high power
|Very high power