Lithium ion capacitor: Best of both worlds?

I note that Paul's analysis did not factor in the number of charge/discharge cycles into the cost. These capacitors have the potential for 1 million cycles, but let's just take the conservative number of 100,000 above. That's about 100 times better than the lead acid batter at full cycle depth. Hence, in some applications, you would not need 100 battery replacements with battery cost and labor cost. Plus the package can be fully sealed with no battery access needed. Seems kind of silly to compare a 150 year old technology with a brand new one, and then reject the new one while waiting for portable nuclear fission. I'm quite sure a factor of 10 price drop in these capacitors will arrive before portable nuclear fission. At that price point, lead-acid batteries might be obsolete. Of course, an even newer technology may soon surpass the Li-ion capacitor. Who can say?

Ya i agree your concept. It will be used to many researchers thanking you

"runs" apologies for the typo...

Give me a Flux Capacitor that tuns on banana skins and fag butts!

PS - Capacity (2200) seems to be about: 4.41 Wh -> 1A for 8360 secs -> or 232 mA for 10 hr (discharge to 0V) or 98 mA for 10 hr(discharge to 2.2V) 98 mA * 3V avg = 294 mAH/cell

They need to work on the weight and price here. A quick calculation suggests a lead-acid deep-cycle battery has an energy density of about 10.5 Wh/kg packaged into a final product? And it would take about 286 ea 2200F capacitors to provide equal capacity?? 8360 Coulombs capacity (3.8V) => 1A for 8360 secs at 1.9V avg => 1.9 * 8360 / 3600 = 4.41 Wh/cell lead acid = 12 * 105 = 1260 Wh Need 1260 / 4.41 cells = 286 286 * 2200 * 0.10 = $62,920 Need to cost reduce by a factor of 1000 - No deal. I'll wait for portable nuclear fission.

Yes, seems like it would take over 5 grand to get the 140v or so battery pack you would need. That's not too bad if these things work as claimed. If the price drops by half, then you would have something. That seems possible with reasonable production quantities.

Very Cool & promising. Thanks for the tip!

I didn't see a discharge curve but a nice thing about the Li-Ion battery is the flat discharge curve. You can use a cheap linear regulator on that and get 3V with pretty good efficiency. This will have a steep sloped discharge and I you'll need a buck-boost switcher to utilize the capacity.

490mAH battery (equivalent)is a very small battery. Does the 10CA means the 10-hour constant discharge current of it (i.e. 49mA)?

Margery, Thanks for bringing these types of advancements to our attention. A couple of things though: 1. LiFePO4 batteries have demonstrated 2000+ cycles while maintaining greater than 80% capacity. Obviously, not the 100K+ cycles out of a capacitor but better than a standard laptop battery. 2. LiFePO4 battery energy density: 170 Wh/l, 80 Wh/Kg, significantly higher than these capacitors, which wouldn't make them an ideal substitution.

I am sure you meant a less than 10% drop in capacity (90% capacity remaining).

One of my former companies used Super capacitors to replace short term battery backup for Microprocessor products that normally stay powered.