What is a Lithium-ion capacitor?

For anyone that wants to see a real data sheet:

Nominal Voltage: 4.0V High Power and Energy Densities Cycle Life > 50K Cycles Capacitance Range: 10F-1200Farads

https://abracon.com/product-lineup/frequency-control-timing-...

Note that the original data sheets said that these could be wave soldered. ABSOLETLY NOT. Even hand soldering they must be treated with respect, a lot of respect.

One of the major problems with these is there a minimal voltage that they must not go below. Their life gets shortened. I've never seen data on how much.

To my knowledge Li-Ion Capacitors were first introduced to the market by Taiyo-Yuden in 2010. They are no longer in this market. I wrote a blog about it back then:

http://blog.softwaresafety.net/2010/11/introducing-lithium-i...

Large, charged capacitors are pretty frightening. Batteries too, but their discharge rate is limited to the speed of the chemical reaction.

Dumb question but I though capacitors store energy and not power?

Let's say you want to make a hybrid car lighter-weight. Where is this useful?

Power density and cycle life are truly impressive. Energy density is super low

And no mention of the self discharge rate.