Kia is reportedly considering the use of ultra-capacitors to store electrical energy in the next generation version of its fuel cell vehicle. Ultra caps have an advantage over batteries in that they can absorb and release energy much more quickly. Unfortunately, they don't have as much capacity and are currently much more expensive. There is a lot of work being done on capacitors and EEStor has made claims of tremendous progress. So far, though, EEStor has not publicly demonstrated any prototypes of its capacitors. In its current form, the Sportage FCEV has a range of 235 miles. Interestingly Honda has gone the opposite direction for its fuel cell vehicles. The previous-generation Honda FCX used ultra-caps but those have been replaced by a lithium ion battery in the FCX Clarity.

[Source: The Telegraph]

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