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Hybrid ultracapacitors enhance battery tech

Posted: 17 Aug 2011     Print Version  Bookmark and Share

Keywords:battery  hybrid  ultracapacitors 

As a result, Ioxus' hybrid ultracapacitors can be charged and discharged at nearly any rate—allowing them to swallow-up and discharge-out vast or minuscule currents as required by an application. Their only downside is that they cannot store as much charge volume as a traditional battery, nor store it for as long, but the distributed architecture used by applications compensates for these shortcomings, according to Ioxus.

"Hybrid capacitors can be added to supply energy right where it is needed," says Hall. "They store more energy than an ultracapacitor alone, and can endure nearly unlimited numbers of charge-discharge cycles compared to lithium-ion batteries."

hybrid ultracapacitors

Ioxus hybrid ultracapacitors with built-in lithium-ion batteries enables distributed storage architectures that works better than either technology alone.

Hybrid ultracapacitors do not store as much charge as a lithium ion battery, but they do store about 100 per cent more charge than an ultracapacitor alone, plus provide almost unlimited charge/discharge cycling. Most lithium ion batteries can only be charged/discharged a few hundred times, and even special long-term versions are limited to a few thousand cycles. Hybrid ultracapacitors, on the other hand, typically can be charged and discharged more times than the lifetime of the product in which they are being used—more than 20,000 cycles in tests conducted at Ioxus.

Hybrid ultracapacitors also offer much more instant-on power than even the strongest battery—up to 5 kiloWatts per kilogram compared with 3kW/kg for even the highest priced batteries, according to Ioxus, which also claims that its hybrid ultracapacitors are 95 per cent energy efficient, compared with 70 per cent for the best lithium ion batteries.

- R. Colin Johnson
  EE Times

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