The Lithium-ion Capacitor is a hybrid energy storage device, classified as an electrochemical capacitor, that combines the rapid charging, high-power capability, and long cycle life of a capacitor with the higher energy density of a battery.
General Capacitor [GC] is introducing a patented Li-Ion Capacitor [LIC] that offers the highest energy density of any ultracapacitor in the commercial market.
GC is currently producing the 3.8V LIC in 200F, 1100F, and 3000F cell.
Ultrathin LIC 1-10F cells are currently under development.
The GC 3.8V LIC 3000F is capable of 18 Watthours/kg of specific energy, 30 Wh/L of energy density, 8 Kilowatts/kg of power density, a maximum discharge current of 150 amps, and a rated lifetime of over 100,000 charge cycles.
The GC 3.8V LIC operates in a range of 3.8 to 2.2 V and a cell surface temperature range of -40° to 65° C.
Li-ion capacitors do not trigger thermal runaways and are inherently safer to use than lithium batteries.
GC is a clean tech company and manufactures using only environmentally-friendly methods and materials.
Higher Voltage and Energy Density
The LIC cell is composed of (+) activated carbon cathodes and (-) graphitic anodes. Anodes are pre-doped with lithium ions, which lowers charge potential and results in an overall higher cell voltage. Lithium-ion capacitors have a max voltage of 3.8V compared to 2.7V of electric double-layer capacitors.
The GC 3.8V LIC is capable of 18 Wh/kg of energy density, while EDLCs are only capable of 6-7 Wh/kg.
Excellent Cycling Peformance
The GC 3.8V LIC is rated to perform over 100,000 charge-discharge cycles while retaining over 80% of initial capacitance. Most rechargeable batteries are only capable of around 500-1000 charge cycles.
Due to their high voltage and rapid discharge, LICs are well-suited to be used in tandem with batteries. In hybrid energy storage systems, Li-ion capacitors provide auxiliary peak power and prevent batteries from performing deep discharges. This improves overall system performance, efficiency, and lifetime.
LICs exhibit an average loss of ~5% voltage from maximum charge over a 3-month period.
EDLCs typically undergo a ~20% voltage loss after only 1-month.
Wide Temperature Range
GC 3.8V LICs are tested under extreme temperature conditions to simulate all possible applications. Testing includes environments of 65° C to simulate hybrid-electric vehicle engines and wind/solar farms; and freezing temperatures of -40° C to simulate arctic and aerospace operating conditions.
LIC technology is inherently much safer to use than lithium-ion batteries. Lithium-ion capacitors do not contain lithium metal oxide electrodes that can trigger thermal runaways like in lithium-ion batteries.
LICs are safe, reliable, environmentally-friendly, and aren't as heavily regulated as lithium-ion batteries in regards to safety and transportation.