Safety Concerns Charging Lithium-Ion and Solid Anode lithium Batteries (Duralite)

[cameron]

Frank,
 IF you have any documents that state ANYTHING that are dated as to the
use & Cautions of Li-metal & Li-ion could you please forward to me.
 Any cost involved I will gladly pay. I am very interested in anything 1
year and older.
                                      Cameron Smith
                                           dentdoc007 at bellsouth.net
                                                 770-596-7699

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Frank Bis
Sent: Saturday, May 08, 2004 12:02 PM
To: NSRCA Discussion List
Subject: Safety Concerns Charging Lithium-Ion and Solid Anode lithium
Batteries (Duralite) 


I have been working in the battery area for 40 + years so let me pass on
my knowledge.  When the Duralites first hit the market I went on line
and said "Be very careful with these solid lithium anode cells"- they
can vent catch on fire etc especially after repeated cycling.  The
reason for this is after several charges the lithium forms Dendrites
(spikes on the surface) which punch through the separator and short out
the cell.  No one paid any attention to this.  Now in the case of the
Lithium-Ion these cells DO NOT LIKE TO BE OVERCHARGED.i.e. above 4.2
volts.  They will vent and catch on fire.  I use them in flat packs but
each cell has a protective circuit on the cell and can be charged at
constant current using a standard charger at 250 mA.  When any cell in
the two cell pack reaches 4.2 V the protective circuit on the cell
senses this and takes the cell off line, hence the battery of two cells
off charge.  Yes these battery packs are a bit lighter and have a higher
energy density (Wh/kg).  Let me pose this, Nickel-cadmium cells are a
proven technology and can be fast charged safely and work.  Why not stay
with they.  The Nickel-metal hydride is a good system.  However, it
looses capacity on stand, and requires careful field charging to prevent
it from getting too hot and venting.  Also it does not work as well at
low temperatures.  My advice stay with Ni-Cd.

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