General Capacitor

High Performance Lithium-Ion Capacitors

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General Capacitor is the developer and manufacturer of G-CAP lithium-ion capacitors and HX-CAP hybrid ultracapacitors. The G-CAP and HX-CAP represent a new generation of high performance electrochemical capacitors that contain the high energy density of lithium-ion batteries and the high power density of capacitors. These novel energy storage devices are capable of rapid charge-discharge rates and extensive cycle life for various energy storage and pulsed power supply applications in electronics.



General Capacitor [GC] manufactures the patented G-CAP Li-ion Capacitor (LIC), featuring 3.8 to 2.2 V operating Voltage, -40 to 65° C temperature range reliability, and over 100,000 cycles of rated cycle life. At 20 Wh/kg of gravimetric energy density, the G-CAP LIC has the highest energy density of any capacitor currently available on the commercial market and 3 to 4 times that of conventional ultracapacitors. G-CAP standard models include 200F (Farad), 1100F, and 3000F laminate cells. GC is also introducing the Ultrathin 5F cell, the thinnest of all ultracapacitors at 0.3 mm, which is capable of rapidly discharging 10 A.

Along with LICs, GC also manufactures the patented HX-CAP Hybrid Li-ion Battery-Capacitor (H-LIBC). This revolutionary energy storage device further incorporates battery-like elements to achieve an energy density of 30-80 Wh/kg, further bridging the gap between batteries and capacitors.



LICs are safer than lithium-ion batteries because they do not contain lithium metal electrodes nor can they trigger thermal runaway reactions. Both LICs and H-LIBCs are environmentally friendly.

GC is a contractor to the U.S. Department of Defense and performs a wide range of research services for government and corporate partners across various industries. Facilities include a specialized dry room and pouch cell manufacturing pilot line that supports advanced R&D and production of over a hundred cells per day.

Ultrathin 5F LIC

Ultrathin 5F LIC

GC is a forefront innovator and supplier of advanced energy storage devices and can develop customized solutions based on exact customer specifications. 



Higher Voltage and Energy Density than EDLCs

Li-ion capacitors are composed of activated carbon cathodes similar to those in electric double-layer capacitors and graphitic anodes similar to those in lithium-ion batteries. General Capacitor uses a proprietary process to pre-dope anodes with lithium, which lowers anode charge potential and results in a higher overall cell voltage of 3.8 Volts. This enables G-CAP LICs to have energy density levels 3 to 4 times higher than conventional 2.7 V electric double-layer ultracapacitors.


Rapid Charging and High Power Capability

LICs can be fully discharged in seconds/subseconds to quickly deliver high current pulsed power loads. The G-CAP 3000F LIC can supply 1900 Watts, or 500 Amps equivalent, of electrical current in 3 seconds. The recommended maximum charging current of the 3000F is 150 A, which can fully fast-charge the cell in under 30 seconds. 

As seen in the Ragone plot, LICs have similar energy density as batteries but rival the power density of conventional and electric double-layer capacitors (ultracapacitors).

LICs and related hybrid electrochemical capacitors are designed to push the limits of the frontier where energy and power converge.


Excellent Cycle Life

G-CAP LICs can perform well over 100,000 charge-discharge cycles. Comparable rechargeable batteries, such as lithium-ion and lead-acid batteries, are only capable of 500 to 1000 charge cycles.


Lower Self-Discharge than EDLCs

An LIC averages a 5% voltage loss from maximum charge over a one-year period, while electric double-layer capacitors typically suffer from a 30-50% voltage loss after only a single month. 


Wide Temperature Range

G-CAP LICs are tested under extreme temperatures to simulate all possible operating conditions. Such testing includes temperatures of up to 85° C to simulate the heat of deserts and electric vehicle engines and freezing temperatures down to -60° C to simulate arctic and aerospace environments.


Safe and Environmentally Friendly

LIC technology is inherently safer to use than lithium-ion batteries because LICs do not contain volatile lithium metal oxide electrodes that can trigger hazardous thermal runaway reactions. 

Thus, LICs aren't strictly regulated like lithium-ion batteries regarding shipping and transportation.

GC is a clean technology company and all products are manufactured using only environmentally-friendly methods and materials.


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