What is a Lithium-ion capacitor?

ksec 46 points 26 comments June 26, 2026
www.jtekt.co.jp · View on Hacker News

Discussion Highlights (5 comments)

LorenPechtel

And no mention of the self discharge rate.

mrDmrTmrJ

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

rpaddock

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...

supertroop

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

SoftTalker

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

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