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DTSTART;TZID=US/Eastern:20100319T150000
DTEND;TZID=US/Eastern:20100319T160000
SUMMARY:Nanostructured Metals and Metal Oxides for Anodes of Li-Ion Batteries, Ming Au -- 
DESCRIPTION:NanoSEC Seminar. Dr. Ming Au of the Savannah River National Laboratory, will be presenting her talk entitled, "Nanostructured Metals and Metal Oxides for Anodes of Li-Ion Batteries" this week.Currently, carbon base anodes are being used for Li-ion rechargeable batteries through Li ion intercalation
process. The theoretic capacity is limited at 372 mAh/g. The volume expansion and breakdown of solid
electrochemical interface (SEI) of carbon anodes during overcharging is one of the reasons of thermal
runaway and fire ignition. Searching for new anode materials that possesses higher energy storage
capacity and inherent fire safety is not only scientist’s passion, but the mandate of industries and
customers, particularly for plug-in hybrid vehicles and portable power sources.It is found that metal oxides and metals can host Li ions through conversion process that changes lattice
structure of metal oxides or forms metal alloys. The theoretic capacity of metal oxides and metals is in the
range of 500 ~ 4000 mAh/g. The metal oxides do not react with polymer electrolyte and generate exceed
heat. The aligned nanostructure, such as nanorods, creates large inter-rods space that is capable to store
the charges and accommodates the volume expansion caused by conversion. It is expected the aligned
nanorods of metal oxides will offer high energy density and power density and inherent safety. Growing
free standing nanostructured anode materials on current collectors directly without additives and binders
represent a new trend of anode fabrication with simplified process and low cost. In other hand, the
nanoparticles of metal oxides can be assembled as the hollow spheres that offers unique feature for anodes
of Li-ion rechargeable batteries. We will present our experimental results and discuss the aspects related
to practical applications in the conference.
LOCATION:Auditorium, Riverbend Research Laboratory South
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