Texas-based EEStor is planning to bring batteries to the market that are based on capacitors rather than chemical reactions. The technology may not only provide greater charge density in smaller packages, but it will also be a 'greener' solution than present day batteries.
A quote from the article at Ars Technica:
...the patent application suggests that the charge storage is much higher than anything achieved in an academic lab: 52 kilowatt-hours in a 2,000 cubic inch capacitor array. A rough conversion calculation suggests that this is over 10 times the power density of standard lead-acid batteries...
Capacitor-based electrical storage is inherently different from chemical reaction where charge is stored between two conductors by separating them with insulation. EEStor claims to use barium titanate as the insulator (Wired). However, skepticism thrives around the product, since the "patent application suggests that the charge storage (for barium titanate) is much higher than anything achieved in an academic lab" (Ars Technica). Despite this, Toronto-based ZENN motors is planning to roll out the batteries in less than a year.
An article at Gizmodo reports:
...A car equipped with EEStor's Electrical Energy Storage Unit (EESU) is said to only need $9 worth of electricity to travel 500 miles, compared to the $60 worth of gasoline needed by a conventional vehicle with an internal combustion engine...
If this EEStor (founded by ex-IBM employees) gets the breakthrough in battery technology, it would mark a great advantage to battery usage across all segments, most importantly in the mobile segment where more powerful devices are debuting with greater frequency.