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 currently manufactures 3.8V LIC pouch cells in 200F, 1100F, and 3000F versions.
Ultrathin and micro form factor 1-10F cells are being developed.
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.
GC 3.8V LIC cells operate in a voltage range of 3.8 to 2.2 V and a 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 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.