* High energy density (2.7V 5000F Prismatic : 5.8Wh/kg, 7.1Wh/l)
Which is not that special.
Experimental electric double-layer capacitors from the MIT LEES project have demonstrated densities of 30 W·h/kg and appear to be scalable to 60 W·h/kg in the short term, while EEStor claims their examples will offer capacities about 400 W·h/kg. For comparison, a conventional lead-acid battery is typically 30 to 40 W·h/kg and modern lithium-ion batteries are about 160 W·h/kg.
The Nesscap ultracapacitor is an Electric Double Layer Capacitor (EDLC) that uses an activated carbon powder and coating process, common in the battery industry, to prepare electrodes as opposed to using a higher-cost carbon cloth or other manufactured carbon structures. The Nesscap ultracapacitor’s high energy density is made possible through the use of a proprietary binder formulation and specially developed electrode-making process. For Nesscap ultracapacitor cells above 1000 Farad, cell structure and process technology have been optimized to achieve a major reduction in equivalent series resistance (ESR). The 5000F/2.7V Nesscap ultracapacitor exhibits energy densities of 5.8Wh/kg & 7.1Wh/l and power densities of 5.2KW/kg & 6.4KW/l.
Earth2tech.com reports Nesscap, founded back in 2001, says its ultracapacitors can deliver 10 times more power and last 10 times longer than standard batteries, and can store more energy than other commercially available ultracapacitors. The startup is targeting energy storage for consumer electronics, renewable energy on the power grid, and vehicles and sells ultracapacitor in both cells and modules that vary in size and power.
Do not see where Nesscap is claiming new products with a stated figure for Wh/kg.