[ref
http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Battery-salt-bath-to-increase-EV-pack-range-td4682652.html
]
http://www.gizmag.com/battery-electrode-lithium-salt-csiro-qut-rmit/43825/
A salty battery bath to combat EV range anxiety
June 14, 2016 Colin Jeffrey
[images
http://img-2.gizmag.com/salt-bath-electrodes-3.jpg?auto=format%2Ccompress&ch=Width%2CDPR&fit=crop&h=394&q=60&rect=0%2C88%2C1622%2C913&w=700&s=1d425dd0798d6588ecf91ef2021c0c1b
Scientists from the CSIRO, working jointly with researchers from RMIT
University and QUT, have created a salt bath pre-process that
promises to
vastly improve lithium-based battery life and performance (Credit:
CSIRO)
http://img.gizmag.com/salt-bath-electrodes-2.jpg?auto=format%2Ccompress&ch=Width%2CDPR&fit=max&h=700&q=60&w=700&s=64937f844f66deecd7f0a4cdd4ed9236
]
The degradation of electrodes in lithium-based batteries has been a
major
inhibitor to their operating life, particularly when dendrites
"growing"
from these corroding electrodes short-circuit in the electrolyte.
Australian
researchers have found that pre-treating lithium electrodes in a
special
salt bath decreases the breakdown of the electrodes and boosts
performance
and battery life so markedly it could bring an end to range anxiety
for
drivers of electric vehicles.
Scientists from the CSIRO, working jointly with researchers from RMIT
University and the Queensland University of Technology (QUT), claim
that
their pre-treating technique is so efficient that even after 1,000
charge/discharge cycles, their prototype retains greater than 99.5
percent
Coulombic efficiency, which is a measure of the difference between
the
incoming and outgoing charges in a battery as it cycles through
charging.
The researchers believe that their new process will help bring on the
development of super-efficient energy storage methods that will
completely
negate battery range anxiety that is a major impediment for the
electric
car
industry today.
"Our research has shown by pre-treating lithium metal electrodes, we
can
create batteries with charge efficiency that greatly exceeds standard
lithium batteries," said CSIRO battery researcher Dr Adam Best. "The
pre-treatment reduces the breakdown of electrolytes during operation,
which
is what determines the battery's increased performance and lifetime."
By immersing lithium metal electrodes in an electrolyte bath
containing a
mixture of the lithium salts Lithium bis(fluorosulfonyl)imide (LiFSI)
and
lithium hexafluorophosphate (LiPF6) and the ionic liquid
1-Methyl-1-propylpyrrolidinium chloride (C3mpyr), the pre-treatment
covers
the surface of the electrode with a protective film that is so
efficient
that even after more than 2,500 hours of battery cycling, no evidence
of
any
dendrite formation was found.
Whilst a myriad other methods have been researched on eliminating
dendrite
formation from the degradation of lithium battery electrodes,
including
coating them with carbon nanospheres and changing the composition of
the
electrolyte in which they are immersed, this latest technology has
shown
the
largest number of charge/discharge cyclic efficiency with absolutely
no
dendrite formation visible.
Other advantages of this process include the ability for treated
batteries
to sit on the shelf for up to a year without their performance being
affected, and that the techniques are simple and easy to adopt in
current
battery manufacturing methods.
The CSIRO holds patents to the electrolyte salt solutions, which come
in a
variety of different chemical compositions. The research team is now
intent
on creating and evolving batteries based on the new process and
techniques,
and is currently searching for commercial collaborators to assist in
commercial development of the technology.
[© GIZMAG 2016]
...
http://www.csiro.au/en/News/News-releases/2016/Salt-baths-boost-next-gen-batteries-for-electric-cars
Salt baths boost next gen batteries for electric cars
14 June 2016
...
http://www.nature.com/ncomms/2016/160613/ncomms11794/full/ncomms11794.html
Stabilizing lithium metal using ionic liquids for long-lived
batteries
13 June 2016
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