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Lithium - air battery 10 times capacity of standard batteries

13-03-2010 4:28pm

#1

Capt'n Midnight

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http://chemistry.st-and.ac.uk/staff/pgb/group/lio.html

http://www.theregister.co.uk/2009/05/19/lithium_oxygen_stair_battery/print.html

"Our target is to get a five to ten fold increase in storage capacity, which is beyond the horizon of current lithium batteries," says Bruce. "The key is to use oxygen in the air as a re-agent, rather than carry the necessary chemicals around inside the battery."

Bruce and his team give some details of the STAIR technology here (http://chemistry.st-and.ac.uk/staff/pgb/group/lio.html), under the less snappy tag "lithium oxygen battery". As the battery discharges, lithium ions from the electrolyte combine with electrons from the circuit and oxygen from the air around to produce lithium Li2O2. As the battery is charged up again, restocking it with lithium ions, the oxygen is emitted once again.

Bruce and his crew say that they "have demonstrated evolution of O2 on charging". They also say that "values of 1220 mAhg-1 are, in principle, possible". The accompanying diagram seems to indicate that this refers to a discharge voltage in the region of 2.5V or so.

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