Event
MSE Seminar Series: David Lashmore
Friday, November 2, 2012
1:00 p.m.-2:00 p.m.
Room 2108 Chemical and Nuclear Engineering Bldg.
JoAnne Kagle
301 405 5240
jkagle@umd.edu
An All CNT Li-S Secondary Battery
David Lashmore, Ph.D.
CTO and Vice President, Nanocomp Technologies
Nanocomp Technologies is developing an all CNT battery consisting of CNT large sheet current collectors coated with silicon for the anode and stabilized form of sulfur as the active species for the cathode. The safety implications of using an CNT system involve: (1) self-stabilizing effect of the CNT vs. temperature characteristics that increases the thermal conductivity if there are any temperature excursions e.g. the hotter the system the more heat is conducted away. (2) very high strength of the CNT material, and (3) fatigue resistance of the CNT based systems. It has become apparent that CNT current collectors can replace metals resulting in significant weight savings for battery applications especially for lithium based electrochemistry Nanocomp can product such materials in volume so that for the first time, dissimilar metals such as copper and aluminum need not be used in electrochemical systems, not only saving weight, but more importantly eliminating corrosion couples and enabling more aggressive electrolytes, such as Lithium is (trifluoromethanesulfonyl)imide (LiIm), to be used in lithium based electrochemical systems. Capacity, Energy and Power: Coating of these CNT current collectors with silicon, results in a high capacity electrode with a comparative reduction of electrode resistance; therefore the Joule heating associated with high current performance is less.
