Friday, October 2, 2009

Nesscap Ultracapacitors

What I find most welcome about this item is that it represents direct competition for EEStor. While some find the claims made hard to swallow, that is really not the issue.

One can make an ultracapacitor out of ball bearing sized capacitors if one wished it. It simply would store way too little energy. Reducing the size of the little balls increases contained power density as an inverse power ratio. Thus cutting the size in half should increase power by eight. I am sure that this is not totally complete but I would be very surprised to not find a cubed variable in the relevant equation’s denominator.

Thus the secret to making useful ultracapacitors is to manufacture the right moon dust. EEStor has convincingly done just that as confirmed by independent lab work.

Their optimism suggests that they have a good protocol for making devices from this moon dust. After all, they have had years to figure it out. The challenge is and was to produce the sizing needed to achieve performance.

The drawing here is showing the same thing.

This means that others are now fully in the hunt to produce these devices and that surely means their commercialization is close.

September 30, 2009

South Korean company Nesscap Claim Ultracapacitors with 10 times the Power and Lifetime of Batteries

Nesscap Inc., a South Korean-based ultracapacitor manufacturing and power storage solutions company, announced today that it has closed a bridge financing round in the amount of $9 million.

Nesscap ultracapacitor information

* 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. 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.

The highest ultracapacitor energy storage claims are the MIT work and carbon aerogel capacitors have achieved 325 J/g (90 Wh/kg) energy density and 20 W/g power density.

Ultracapacitors tested by UC Davis in 2009

Lithium Batteries tested by UC Davis

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