Chilled battery

A battery with organic electrodes that works well at the chilly temperature of -70 degrees Celsius could be used in the extreme environment of the Earth's polar regions or in outer space, according to researchers writing in the journal Joule. Conventional lithium ion batteries have a relatively balmy lower operating temperature of -20 degrees Celsius but even then they only operate at 50% capacity; at -40 it's just an eighth of full capacity. Yong-yao Xia of Fudan University in Shanghai, China, and colleagues used polytriphenylamine (PTPAn) for their cathode and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA)-derived polyimide (PNTCDA) anode and an ester-based electrolyte that has a lower freezing temperature than the conventional esters used in lithium batteries.