[Todos] Lunes 22 de octubre - Seminario DQIAQF - INQUIMAE

[andrea en qi.fcen.uba.ar]

Seminarios DQIAQF - INQUIMAE, lunes 22 de octubre - 13 hs.

Aula de Seminarios INQUIMAE - DQIAQF
Facultad de Ciencias Exactas y Naturales
Ciudad Universitaria - Pab. 2  -  Piso 3


Battery concepts for high density energy storage: Principles and practice.
C. Austen Angell
Dept. of Chemistry and Biochemistry,
Arizona State University, Tempe, AZ 85287-1604


The utilization of chemical sources of electrons for technological
applications may date back to the gold-plating technologies of biblical
times. Currently, success in this area is critical if solar energy
harnessing is to become efficient and petroleum-consuming power trains are
to be replaced. We review the different technologies under development for
storing and delivering portable energy (“bottled electrons”). Most of the
technology in current use involves the encapsulation of both electron
sources and electron sinks, but as this is both volume-inefficient and
dangerous, consideration is also given to devices under development such as
the lithium-air battery, and the more advanced zinc-air battery in which
only the source needs to be “bottled”. The latter devices are limited to
about 3.0 V by the free energy of formation of Li2O. For higher voltage
devices, chemicals that store oxygen at gigabar effective pressures, and
electrolyte systems that can tolerate voltages above 5V, are needed. In
this area, unlike materials science, the technology
developed by nature over 4 bn years of R&D gives little guidance as it has
largely been limited by the decomposition potential of water. The best
efforts of humankind in this area, and the principal stumbling blocks, will
be reviewed.
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